Answer:
true
Explanation:
Which types of organisms are always made up of only one cell each?
Answer: Unicellular organisms.
Explanation:
Answer:
Unicellular organisms: Bacteria, protists, and yeast
Explanation:
Unicellular organisms are made up of only one cell. All of the functions needed by the organism are carried out by that one cell. Bacteria, protists, and yeast are some examples of unicellular organisms.
A group of runners gathers every week to train for long-distance runs. Several students in your anatomy class are part of this group. Your classmates are curious about the physiological changes that occur with exercise. You do a little research in class and find several changes occur as exercise begins. Which of these correctly lists the changes that occur as exercise begins?
A) increased vasodilation, increased cardiac output, increased venous return
B) decreased vasodilation, decreased cardiac output, decreased venous return
C) increased vasodilation, decreased cardiac output, increased venous return
D) increased vasodilation, increased cardiac output, decreased venous return
Increased vasodilation, increased cardiac output, decreased venous return occurs during exercise.
Option D.
Explanation:Exercise is a condition where the body works more than normal, leading to more consumption of nutrients and oxygen in the active muscles of body. The exercise also produces a lot of carbon dioxide in the muscles.
The increase in carbon dioxide and the need of oxygen and nutrients in the muscles lead to the para sympathetic stimulation which leads to the increase in vasodilation. This increase in vasodilation leads to reduced peripheral resistance which in turn reduces the venous return.
While, heart has sympathetic stimulation which causes the heart rate to increase and as a result cardiac output to increase too. But due to reduced venous return, the stroke volume increases up to a certain limit from where it remains still, because of the reduced blood in heart.
Answer:
A) increased vasolidation, increased, cardiac output, increased venous return
Explanation:
did it on usatestprep
Which of the following events do biologists consider a random change?
a)directional selection
b)speciation
c)disruptive selection
d)genetic drift
Answer:
D. genetic drift
Explanation:
Answer:
it is d genetic drift
Explanation:
There are no species of organisms alive today that are directly related to the triceratops. This information indicates that
A.
all organisms that lived in the past can be linked to newly evolved organisms in the present.
B.
triceratops are extinct, and no organisms alive today evolved from the triceratops.
C.
triceratops have evolved into a species that is so different, scientists are unable to discover the connection.
D.
fossil evidence is inconsistent with the theory of evolution.
Answer:
There are no species of organisms alive today that are directly related to the triceratops. This information indicates that triceratops are extinct, and no organisms alive today evolved from the triceratops.
Explanation:
Answer:
b
Explanation:
triceratops are extinct and no organisms alive today evoled
Which of these is an agent of abrasion?
A. Rock pieces
B. Acid rain
C. High pressures
D. Plant roots
Answer:
A. Rock pieces
Explanation:
Abrasion is the breaking down and wearing away of rock material by the mechanical action of other rocks. Three agents of physical weathering that can cause abrasion are moving water, wind and gravity. None of those are agents of abrasion. But Rock pieces are a result of abrasion.
Rock pieces act as an agent of abrasion, which is a process of mechanical weathering caused by physical forces such as gravity, water, wind, or ice. Option A is correct.
Among the options given, rock pieces are an agent of abrasion. Abrasion is a type of mechanical weathering where one rock bumps against another, causing the surfaces to wear down over time. This can happen due to gravity, moving water, strong winds, or glacial movements.
When pieces of rock are moved by water or wind and collide with other rocks, they cause the surfaces to erode. For example, the ice in glaciers also cause abrasion when pieces of rock embedded in them scrape against the rock below.
Hence, A. is the correct option.
Examine the map above showing the acidity of rainfall across the USA. How might the distribution of the acidity be explained?
A.
The acidity of the rain decreases over the western half of the country because there is less rainfall there.
B.
The acidity of the rain increases over the eastern half of the country because evaporated water from the Atlantic Ocean affects the air's pH.
C.
The acidity of the rain is directly related to the amount of forested land in each region.
D.
The acidity of the rain increases over highly populated, highly industrial regions because of the accumulation of waste products in the air.
Answer: i think it is a
Explanation:
i took a test and i got 100%
Answer:
The acidity of the rain increases over highly populated, highly industrial regions because of the accumulation of waste products in the air.
Explanation:
Hope This Helps!!!!
What happens to the bases when an insertion mutation occurs
If the diploid number in a liver cell is 52, how many chromosomes are there in the egg of this organism?
Answer:
there are 26 cell of the organism
Rasheed crossed plants that were hybrid-have two different alleles for the traits of
flower color, seed color, and seed shape as part of an investigation designed to verify
the results of Gregor Mendel's experiments. The table below displays the results.
RASHEED'S RESULTS
Characteristic
Offspring phenotypes
Ratio
flower color
705 purple
224 white
3:1
seed color
6,002 yellow
2.001 green
3:1
seed shape
5,474 round
1.850 wrinkled
3:1
Based on the information in the table above, which of the following is a valid
conclusion?
A. White flowers are dominant.
B. Yellow seeds are a recessive trait.
c. Wrinkled seeds are a recessive trait.
D.Flower color is the result of environmental conditions.
Answer:
Wrinkled seeds are a recessive trait
Rasheed crossed plants that were hybrid-have two different alleles for the traits of flower color, seed color, and seed shape as part of an investigation designed to verify the results of Gregor Mendel's experiments. Wrinkled seeds are a recessive trait shows the phenotypes.
What is trait ?Traits are the characteristics of a gene in an organism are influenced by the environment and expressed by genes, the Physical characteristics of an organism, such as hair color, leaf form, size, behavioral characteristics are traits.
specific traits which allow an organism to be successful in their ecosystem, some of the physical characteristics include fin length, body shape, color patterns, eyesight, and muscle definition.
Species with variation in traits For example, white-tailed deer in Pennsylvania have seed coat color with limited variation, all the organism have characteristics are genetic traits or behavioral traits.
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Explain how geographic isolation can affect
evolution.
NEED HELP NOW!!
Answer:
Geographic isolation stops the exchange of genetic material between the two populations. ... Differences in climate and food sources can create selective pressures unique to each population. Eventually, the two populations might become different species, but not always.
Final answer:
Geographic isolation triggers allopatric speciation by physically separating populations, leading to genetic divergence and potentially the evolution of new species. It often results in the emergence of endemic species uniquely adapted to localized environments.
Explanation:
Geographic isolation affects evolution by preventing populations of the same species from interbreeding. This process, known as allopatric speciation, can be initiated by various events, such as the formation of a river or valley, a group of organisms becoming stranded after migrating, or seeds being carried to an island by the wind or ocean currents.
Once populations are isolated, there's no genetic flow between them. Genetic divergence may occur as natural selection acts differently on the populations or as a result of genetic drift. These changes can eventually lead to reproductive incompatibility, meaning that even if the two populations come into contact again, they can no longer interbreed and have thus evolved into separate species.
Endemic species, which are found only in specific geographic locations, are often the result of long periods of geographic isolation that have allowed them to develop unique characteristics catered to their particular environment, isolated from the gene pools of their species located elsewhere.
Normal cells may undergo changes during cell processes that can lead to
cancer. However, most of them do not form cancers.
Which of the following explanations accounts for the relatively low rates
of cancer?
A. Cancerous cells die when they are exposed to radiation.
B. Cancerous cells are crowded out by normal cell growth.
C. Cancer cells grow only very slowly at first.
D. DNA repair systems fix the mutation before it causes cancer.
Answer:
A
Explanation:
10. Cloud droplets form and grow as water vapor condenses onto hygro-
scopic condensation nuclei. Research has shown that the maximum
radius for cloud droplets is about 0.05 millimeter. However, typical
raindrops have volumes thousands of times greater. Explain how cloud
droplets become raindrops.
Answer:
According to collision- coalescence theory, formation of raindrop from cloud droplets occurs when cloud droplets collide and coalesce or stick together.
Explanation:
The only significant difference between a raindrop and a cloud droplet is that a raindrop consist of a velocity that is non-negligible during the fall.Larger droplets having higher terminal velocities fall faster and collide with smaller droplets. Often the cloud droplets stick together and coalesce to form a larger droplet. This starts a chain reaction where these bigger droplets fall even rapidly, collide with the other droplets in their path and merge with these droplets.What are the five categories of adaptations?
Describe how thermal energy and temperature are sim-
ilar. How are they different?
Kinetic energy is the main cause on which both temperature and thermal energy are dependent.
Explanation:
Both the temperature and the thermal energy are physical quantities. Both temperature and thermal energy are having thermodynamic state function. Both of them are measurable in nature that is quantitative . Both of them do not have any direction that is they are scalar quantities.
Temperature is not dependent on the quantity of a substance but in case of thermal energy it is dependent on the quantity of a substance. Temperature is based on the average kinetic energy of given particles but in case of thermal energy it is based on the total kinetic energy of given particles.
A famous ________ is at the mouth of the Mississippi River
Answer:tributary
Explanation:
Nutritionists and doctors do not recommend energy restrictions below. Calories for women and. Calories for men.
Nutritionists and doctors recommend not falling below 1,200 calories per day for women and 1,500 calories for men to maintain proper health and metabolism. Athletes may require more, up to 3,000 to 5,000 calories, depending on their level of activity. Balanced diets and avoiding very low-calorie diets are essential for metabolic health.
Explanation:Nutritionists and doctors typically recommend that energy intake should not fall below certain thresholds to ensure adequate nutrition and maintain metabolic health. For women, the lower limit is often set around 1,200 calories per day, while for men it is typically around 1,500 calories per day. These numbers can vary based on the individual's body size, age, activity level, and other health-related factors.
The quality and quantity of the food consumed markedly affect one's metabolism. Energy-dense foods with poor nutritional quality, such as sugary drinks, can lead to weight gain and associated health issues. Nutritional needs increase with physical activity, and athletes, in particular, may require significantly more calories. For instance, competitive athletes often require between 3,000 to 5,000 calories daily, whereas a sedentary person may need only about 2,000 calories. Energy requirements further vary by gender; men generally have higher caloric needs than women due to greater muscle mass.
Regardless of caloric intake, it's crucial to consume a balanced diet rich in vegetables, fruits, whole grains, and lean proteins. It is also important to avoid extremely low-calorie diets, as they can substantially lower basal metabolic rate (BMR) and potentially harm health. Proper caloric consumption aids in maintaining body composition, supporting bodily functions, and ensuring adequate nutrient intake.
Final answer:
Nutritionists typically recommend that women should not consume fewer than 1200 calories per day and men not fewer than 1500 calories per day to ensure nutritional needs are met without adverse health effects. Quality and quantity of food intake are crucial in managing energy needs, which vary based on lifestyle, gender, and activity level.
Explanation:
Nutritionists and doctors typically advise against severe energy restrictions that fall below certain caloric thresholds. For normal daily activities, an average person requires between 1500 to 2000 calories. However, factors such as gender, age, weight, and physical activity level can influence individual energy needs. For instance, men generally need more calories than women due to higher muscle mass. It's important to maintain a balance and consume a diet that provides the quality and quantity of calories necessary to prevent both over-consumption and under-consumption. Over-consumption can lead to health issues such as cardiovascular disease, cancer, and diabetes, while under-consumption can dramatically reduce one's basal metabolic rate (BMR) and lead to other health problems.
Regarding the minimum calorie intake, health professionals generally do not recommend that women consume less than 1200 calories and men less than 1500 calories per day without medical supervision. This is to ensure that individuals still meet their nutritional needs without risking adverse effects on their metabolism and overall health.
In conclusion, a diet that includes a variety of vegetables, fruits, whole grains, and legumes, while limiting sugary drinks and energy-dense foods, is recommended. Additionally, energy needs are highly individualized and should be tailored to one's lifestyle, with discretionary calories adjusted based on activity level and age.
Hemophilia is an X-linked recessive trait. In a family, the father is unaffected and the mother carries only one recessive allele. (1 point) A. All of the male offsrping would be affected. B. Half of the male offspring would be affected. C. All of the female offspring would be affected. D. Half of the female offspring would be affected.
Answer: The answer is A
Explanation:
Final answer:
The correct answer is B. Half of the male offspring would be affected since they have a 50% chance of inheriting the hemophilia allele from a heterozygous mother. Daughters would only be carriers, not affected, because they inherit a normal X chromosome from their father.
Explanation:
Hemophilia is an X-linked recessive trait, meaning it is carried on the X chromosome. A mother who is heterozygous for hemophilia (carrying one recessive allele) has a 50% chance of passing this allele to her sons, since they receive their only X chromosome from her. The father, who is unaffected, cannot pass the hemophilia allele to his sons as they receive his Y chromosome.
Therefore, the correct answer is B. Half of the male offspring would be affected. Daughters, however, would not be affected because they receive one normal X chromosome from their father and would need to inherit two defective X chromosomes to express the disease, which is extremely rare. As the mother carries only one recessive allele, she could pass the defective gene to her daughters, but these daughters would be carriers, not affected.
How is the skin of a reptile an improvement of the skin of an amphibian?
Answer:
Reptiles have dry and scaly skin, whereas amphibians feel moist and sometimes rather sticky. They are vertebrates and cold blooded like amphibians. As compared to reptiles, amphibians have smooth skin. The skin of most amphibians is not water-proof unlike reptiles.
Explanation:
A falcultative anaerobic organism is able to perform aerobic respiration in the presence of oxygen and fermentation in the absence
of oxygen. An example of a falcultative anaerobic organism is brewer's yeast, which is used in the production of alcoholic
beverages. If sealed in a vessel containing oxygen gas, water, and sugar (glucose), the yeast will eventually deplete the oxygen
gas. As long as glucose is available, however, the yeast can still survive.
Brewer's yeast use oxygen preferentially because???
Please answer quick
Answer:
The answer is B. Hope this helps!
Brewer's yeast use oxygen preferentially because aerobic respiration is more efficient than fermentation.
What do you mean by fermentation?Fermentation is a metabolic process that produces chemical changes in organic substrates through the action of enzymes. In biochemistry, it is narrowly defined as the extraction of energy from carbohydrates in the absence of oxygen.
Fermentation is the process of sugars being broken down by enzymes of microorganisms in the absence of oxygen. Microorganisms such as bacteria and fungi have unique sets of metabolic genes, allowing them to produce enzymes.
Both types of fermentation require two primary components, a sugar supply and a bacterial culture; alcohol fermentation use forms of yeast, while lactic acid fermentation normally relies on lactic acid bacteria.
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3. Which one of the following foods could be used to give your cells the greatest amount of
energy? A spoonful of sugar, a spoonful of fat, or a spoonful of protein.
Answer:
One or the other
Explanation:
I believe with full confidence it is protein but sugar could qualify as well
A Spoonfull of fat will the cells the greatest amount of energy because 1 gram of fat gives 9 calories while 1 gram of protein and carbohydrate gives 4 calories of energy respectively.
What is the function of a motor neuron
A motor neuron is a neuron that specifically controls the movement and usage of muscles and glands.
A motor neuron carries nerve impulses from the central nervous system to muscles and glands, resulting in their activation. They connect to muscle fibers at neuromuscular junctions and can be precisely controlled based on the motor unit's needs. This nerve impulse transmission results in muscle contraction.
Explanation:The function of a motor neuron is to carry nerve impulses from the central nervous system to muscles and glands. These neurons change nerve signals into activation of these structures. Motor neurons project to the spinal cord to synapse with more motor neurons in the ventral horn of the spinal cord, which then connect to skeletal muscles and cause contractions.
These neurons connect to the muscles at neuromuscular junctions, where they connect to multiple muscle fibers within a target muscle. The number of fibers that a motor neuron connects to varies based on the required precision of the muscle and the force necessary for that motor unit. For instance, the quadriceps have many fibers controlled by single motor neurons for robust contractions that don't need to be precise, but extraocular muscles are controlled by each motor neuron very precisely since moving the eyes requires less force but needs high precision.
Motor neurons transmit nerve impulses to the muscles causing them to contract. At the neuromuscular junction, the motor neuron axons connect to muscle fibers. Here, the motor neurons secrete a neurotransmitter called acetylcholine that binds to receptors on the muscle fiber, triggering muscle contraction.
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Natural selection argue claim evidence reasoning answer
Answer:
how is this a question
Explanation:
Which animals typically have a reproductive group and a nonreproductive group within their social structure?
Answer: the answer to this question is bees and ants hope this helps
Explanation:
Answer:
bees
Explanation:
edge
Answer the password
Answer:
What password?
Explanation:
The diagram shows genetic structures. Which label best represents the area marked Y?
Answer:
The area marked Y is the DNA.
Explanation:
As we can see in the diagram, The area labelled Y shows a double-stranded structure which is joined together from the centre. The structure of the DNA comprises of two strands which make up the backbone of the DNA. These strands are made up of sugar-phosphate backbones. The strands are joined together by the hydrogen bonding between the nucleotide bases. Hence, the structure Y is that of a DNA.
What process releases the least ATP per molecule of glucose for immediate cell use?
Answer:
Anaerobic respiration
Explanation:
Anaerobic respiration occurs releasing the ATP per molecule of glucose for immediate use by the cell. Anaerobic respiration is carried out in absence of oxygen. There are two forms of fermentation, alcoholic and lactic acid fermentation. In humans, lactic acid fermentation occurs in muscle cells during intense muscular activity.
C6H12O6 → 2C3H6O3 + 150 kJ
which freshwater ecosystems have very low to no water flow
Answer:
Freshwater ecosystems such as lakes and swamps.
If it helps, mark me as brainlest
Fill in the blank.
__________________ uses laboratory methods to look at genes and can be used to identify increased risks of health problems, to choose treatments, or to assess responses to treatments
a.) Genetic modification
b.) Gene therapy
c.) Selective breeding
d.) Genetic testing
Answer:
genetic testing
Explanation:
During what part of the earth's history did living organisms first appear? What were they?
Answer:
The earliest time that life forms first appeared on Earth is at least 3.77 billion years ago, possibly as early as 4.28 billion years, or even 4.5 billion years; not long after the oceans formed 4.41 billion years ago, and after the formation of the Earth 4.54 billion years ago.
Explanation:
The Law of Independent Assortment describes why there is so much
diversity among offspring of a species. A female rabbit that is
heterozygous for long ears and long fur mates with a male rabbit that is
also heterozygous for long ears and long fur. What is the phenotypic ratio
of the offspring of this genetic cross?
LIFF X LIFE
8:8
8:6:2
1:1:1:1
09:3:3:1
9:3:3:1 is the ratio.
Option D.
Explanation:The cross described here is actually similar to Mendel’s Dihybrid Cross where two characters of the organisms are actually taken into account and then the phenotypic ratio of the F2 offsprings are seen.
The genes for the long ears and long fur are both heterozygous in both parents. So both of the parents have a dominant allele and a recessive allele.
Lets suppose the dominant allele for the gene determining ear is E and recessive is e. And the dominant allele for the gene determining fur is F and recessive is f.
So the genotype of both the parents is EeFf.
So the gametes produced by both the parents are EF, Ef, eF and ef respectively.
Thus, if we put these in punnett square and see the offsprings, we will see that phenotypic ratio of Ling eared long furred to long eared short furred to short eared long furred to short eared short furred is 9:3:3:1.
Answer:
9 : 3 : 3 : 1
Explanation: