A Y-linked disease is a sex-linked disorder found on the Y chromosomes. Who can be afflicted with a Y-linked disease?
a. a female offspring if her father has it
b. a female offspring if her mother has it
c. a male offspring if his mother has it
d. a male offspring if his father has it ...?
the answer is letter D or the last one
The human nervous system is broken up into central and peripheral parts. The central system (CNS) is made up of _____.
a. the brain and the spinal cord
b. sensory and motor neurons
c. the brain and motor neurons
Answer:
the brain and spinal cord
Explanation:
A scientist wants to test how much of a base can be added to a solution before the pH of the solution changes to above a certain point. The starting pH of the solution is 7.0, and the scientist wants to know when the pH of the solution changes to above 8.0.Which pH indicator should the scientist use? A.Methyl yellow, which changes from yellow to red around a pH of 4.0 B.Congo red, which changes from red to violet around a pH of 5.0 C.Alizarin yellow R, which changes from yellow to red around a pH of 10.2 D.Phenolphthalein, which changes from colorless to purple around a pH of 8.3
The right answer is D.Phenolphthalein, which changes from colorless to purple around pH of 8.3 (since it is the closest to pH 8).
Phenolphthalein (the symbol φφ (phi-phi) or the general notation HIn, common to other indicators, are used) is an organic compound of formula C20H14O4. It is a pH indicator (or a colored indicator), that is to say, a compound that changes color according to the pH value of the solution in which it is placed.
WILL UPVOTE!
Factor the expression.
x^2 - 49 =
In which stage do vertebrate embryos or offspring show the most similarities?
A. Earliest stages
B. Middle stages
C. Just before birth
D. After birth
Answer:
Option B. Middle stages
Explanation:
During early stages of development, all the embryos are quite similar to each other. Embryos of different organism such as human being, fish etc. share common look alike at certain developmental stages because they all have originated from a common ancestor
However, the maximum similarity arises in the middle of embryonic development stage particularly known as phylotypic stage
Hence, option B is correct
Answer:
middle stages
. Carbon-14 is used to determine the time an organism was living. The amount of carbon-14 an organism has is constant with the atmosphere, but when an organism dies the carbon-14 decays at a half-life of 5,730 years. If an archeologist measured the amount of carbon-14 in an organism and it was 25% of the total amount of atmospheric C-14, what is the age of the organism?
The answer is 11460 years
Some fruit flies are born with curly wings which makes them unable to fly. It has been shown that curly words are caused by a dominant gene which can be represented by the symbol W, while the recessive normal wing gene is represented by the symbol w. If a parent fly with the genotype WW is crossed with a parent of the genotype Ww, what percentage the offspring will have curly wings?
Answer:
The correct answer would be 100%.
The genotype of a parent is WW. Thus it will produce only one type of gamete that is, W.
The genotype of other parent is Ww and thus two types of gametes would be produced W and w.
The cross will result in the production of offspring with two types of genotypes WW and Ww.
Hence, all the fruit flies produced from this cross will have curly wings.
Which of the following is an organic molecule?
A. Fructose
B. Nitrogen gas
C. Hydrogen sulfide
D. Water
Answer:
A
Explanation:
distinguish between the keywords "trait" and "allele".
Populations of predators increase when populations of prey are high because
Lamarck's hypothesis of evolution was based on which theory?
Answer:
Lamarck's hypothesis of evolution was based on the theory of 'Inheritance of acquired character'.
Explanation:
Lamarck was french biologist and explained evolution on the basis of the theory of inheritance of acquired character.
According to Lamarck, organism can pass down the their characters to their offspring that have acquired through the environment by the use and disuse of an organ. Lamarck believe that the organism may acquire a character by the use and disuse of a particular organ. The acquired trait may pass down to the next generation through reproduction. The transmission of characters increases the organism's complexity.
What is an example of eukaryotic gene regulation? Why is gene regulation necessary or advantageous?
Eukaryotic gene regulation, exemplified by the control of transcription initiation, allows organisms to adapt to environmental changes and use resources efficiently, leading to evolutionary advantages.
Eukaryotic Gene Regulation
An example of eukaryotic gene regulation involves the control over the start of transcription, where a multitude of regulatory proteins and elements play a role. One key reason why gene regulation is necessary is because it allows cells to respond to environmental changes and allocate resources efficiently. Moreover, advantageous gene regulation can lead to better survival and reproductive success, providing an evolutionary benefit.
In eukaryotes, the regulation of gene expression is often far more complex than in prokaryotes, involving multiple mechanisms such as the presence of enhancers, which are distant DNA regions that loop back to interact with a gene's promoter. For instance, human cells must coordinate the activity of approximately 25,000 genes without the use of multigene operons, which adds layers of complexity to how genes are turned on and off. This complexity allows for a greater diversity in gene expression, which can be essential for the development and function of multicellular organisms.
The need for gene regulation is exemplified by changes in gene expression, which can have evolutionary consequences. Evolution can act on gene regulation patterns, and changes in these patterns can lead to adaptations that enhance an organism's fitness in changing environments.
Which items would NOT be allowed in a wilderness area?
fishing gear
jet skis
camping gear
hiking gear
Is it Jet Skis??
What occurs when a muscle becomes weaker and smaller from not being used?
Answer
gets stronger
atrophy
weight gain
turns to fat
...?
Mr. Goldsmith suggested that animals must capture energy from their environment. An example of this would be _____.
a rabbit eating grass
a lion running
mice sleeping
a flying squirrel landing on a branch
The correct answer is (a) A rabbit eating grass.
The green plants that make food by the process of photosynthesis is the ultimate source of energy. When the rabbit is eating grass, it will derive energy from it. Green plants is the main source of energy for herbivores animals. Any function of the body such as sleeping, jumping, running requires energy and it is obtained from the food that an organism eats.
The irispupilscleracornea is the opening which allows light to enter the eye.
How does life change in aquatic biomes as depth increases?
Life in aquatic biomes changes as depth increases due to factors such as light availability, temperature, dissolved oxygen, and nutrients. The photic zone extends to a maximum depth of 200 meters, beyond which light cannot reach. Different organisms are adapted to the conditions found in each zone, resulting in a diverse range of species in aquatic biomes.
Explanation:Aquatic biomes undergo changes in their living conditions as the depth increases. One important factor is the availability of light. The photic zone, where sunlight penetrates enough for photosynthesis to occur, extends to a maximum depth of 200 meters. Beyond this depth, known as the aphotic zone, light cannot reach. As a result, organisms in the aphotic zone rely on other sources of energy, such as chemosynthesis or consuming other organisms.
Another important factor is temperature. As water depth increases, temperature decreases, but it remains above freezing. This can affect the types of organisms that can survive in deeper parts of aquatic biomes.
Abiotic factors like dissolved oxygen levels and nutrients also vary with depth. Water near the surface of lakes and the ocean usually has more dissolved oxygen than deeper water, while deeper parts of the ocean are nutrient-rich due to dead organisms that fall from upper layers. These factors shape the structure and diversity of aquatic biomes at different depths.
Can you ZOOLEY??? Ive attached a file.
Yes, I can ZOOLEY.
What is ZOOLEY?ZOOLEY is a logic puzzle that involves figuring out which animals inhabit various areas of a zoo. The puzzle is presented as a map of the zoo, with the cages arranged in two rows, separated by an aisle or corridor. The animals live in cages, and their names are represented by a combination of letters and shapes.
To solve the puzzle, you need to use the clues given to you to figure out the names of the animals. For example, the clue "Which family is visiting the polar bears?" tells you that the family of people (Zuff) is visiting the polar bears (Trick).
Here are the answers to the ZOOLEY puzzle:
What family is visiting the polar bears? Zuff
What kind of family are they? Humans, they are outside the cages observing other animals.
Whose family is the largest? Kazoo
Which is the family of spiders? Lesger, spiders have 8 legs
Whose son has Mr Crocodile just swallowed? Breeze's son was swallowed. Thus, gobble are crocodiles and gender of each animal is designated by shape
Which swimming family has only 3 sons? Squeal. Note flipper and name similarity (ie. seal – squeal)
Which family has just 3 daughters? Lesger, spiders.
Is the polar bear's cub male or female? male.
Which family has no offspring? Slizz, there are only adults in the cage
Which is a family of snakes? Slizz, see lines similar to shape of snake
Which is a kangaroo? Swift, see pocket on side of female
What is the surname of the elephant's baby, which is soon to be born? Ample, see baby inside female, not a gobble because a male is inside a male.
How many sons has Mr. Giraffe? no sons. Noz are giraffes due to long legs
Which family has no father? Squeal
Which mother is away at the hospital? Noz, no female is in the cage
Who are the neighbours of the monkeys? Trick, they are polar bears. The monkeys are kazoo
A wee pelican has wandered into whose cage? Gobbles. this wee animal proves to be a pelican
Which is a family of pelicans? Beeze.
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Locard’s exchange principle is best described as
A) No two pieces of evidence have any similar markings
B) A scientific experiment has been generally accepted by experts
C) Evidence at a crime scene should be replaced with evidence from the victim’s home
D) There is a transfer of evidence when two objects come into contact with each other.
Answer:
There is a transfer of evidence when two objects come into contact with each other
Explanation:
Dr. Edmond Locard's exchange principle states that whenever two objects come in contact, a transfer of material occurs
Which scientist formed his ideas about living things by performing observations with out using a microscope? A.Hooke B.malpighi C.van leeuwenhoek D.vesalius
The correct answer is D. Vesalius
Explanation:
Andreas Vesalius was a Flemish scientist and anatomist that lived during the 16th century, considered as the father of modern anatomy. During this life, Vesalius studied anatomy mainly using dissection and observing the tissues, organs, and structures in them, especially those in animals and humans. Also, he used his findings and ideas to create written works that were the base for later studies in anatomy. Besides this, as compound microscopes for studying living organisms had not been created during Vesalius time, he only used regular observations different to other scientists such as Hooke or Malpighi. Thus, it was Vesalius the one that formed his ideas by performing observations without using a microscope.
Which process occurs in a human muscle when it is forced to make ATP without oxygen. A: ETS reactions. B: Cellular respiration. C: Lactic acid fermentation D: Alcoholic fermentation
Which does NOT represent one of Koch’s postulates?
A. isolate germs from an infected animal
B. grow germs in a lab culture
C. inject germs into a healthy animal
D. watch to determine how long it takes for the healthy animal to become ill
Why is blood type AB+ considered the universal receiver?
Individuals with AB+ blood can receive red blood cells from any other blood type because they have both A and B antigens and the Rh factor, and they do not have anti-A or anti-B antibodies.
Blood type AB+ is considered the universal receiver. Here is why:
1. Antigens on Red Blood Cells:
Blood type AB+ has both A and B antigens on the surfaces of its red blood cells. Antigens are substances that can provoke an immune response if they are foreign to the body.
2. Lack of Anti-A and Anti-B Antibodies:
AB+ individuals lack anti-A or anti-B antibodies, enabling them to accept red blood cells from any donor without their immune system attacking the new cells.
3. Rh Factor:
The '+' in AB+ indicates that the blood has the Rh antigen (also known as the Rh factor). Since AB+ individuals have the Rh antigen, they can receive blood from both Rh+ and Rh- donors.
Which of the following is NOT true of greenhouse gases?
a.
They absorb Earth’s radiation.
b.
They are produced solely by human activities.
c.
They are transparent to incoming solar radiation.
d.
They include carbon dioxide and water vapor.
Some greenhouse gases are created by natural processes as well. Methane gas is an illustration of this, and it is created by farming and cattle. Thus, option B is correct.
What is the effect of greenhouse gases in ecosystem?The consequences of greenhouse gas on the environment and human health are extensive. They aid in the smog and air pollution-related respiratory sicknesses and climate alteration by trapping heat.
Other consequences of climate change attracted on by greenhouse gases consider extreme weather, interruptions in the food activity, and a modification in wildfires.
By confining heat, they contribute to climate happening and respiratory illnesses brought on by smog and air impureness.
Other effects of climate modification pulled on by greenhouse gases consider extreme weather, interruptions in the food supply, and a modification in wildfires.
Therefore, They are produced solely by human activities.
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How was CMB radiation first discovered?
The identification of the Cosmic Microwave Background (CMB) radiation represents a crucial turning point in our comprehension of the cosmos. Here is a brief of how it was initially found:
1. Theoretical hypothesis: George Gamow, Ralph Alpher, and Robert Herman postulated in the 1940s that the Big Bang, the phenomenon that created the universe, would have left behind a weak radiation that penetrates all the space. Around 380,000 years after the Big Bang, when the cosmos first became transparent, this radiation would have been produced.
2. Proof of the hypothesis: Using a large horn-shaped antenna, Arno Penzias and Robert Wilson carried out radio astronomy experiments in the 1960s. They heard a constant background noise that appeared to be coming from all sides.
Therefore, CMB was discovered by Wilson and Penzias which to confirm Big Bang Theory.
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Mangrove forests were traditionally viewed as unhealthy, unproductive environments.
True or False
The given statement is True.
Traditionally mangrove forests were considered as unproductive and unhealthy environments. Therefore people thought that their removal from the environment will make the environment healthy. Traditionally they were viewed as unhealthy and unproductive because there importance ere not known at that time. But now mangroves serves as a breeding ground for fishes and helps the fisherman to grow economically.
Answer:
ITS TRUE
Explanation:
which of the following cells would not have a well-defined nucleus but would have a thick cell wall and ribosomes?
A) onion cell
B) E. Coli bacteria
C) human brain cell
Answer:
A.
onion cell
Explanation:
A soccer player has been sprinting up and down the field. She is breathing very hard and has a burning sensation in her muscles. Which of the following is the most likely cause of her symptoms?
A. Muscles are getting rid of carbon dioxide by the Krebs cycle.
B. Muscles are building up lactate from anaerobic respiration.
C. Electron transport chains in the mitochondria are producing too much ATP.
D. Glycolysis is producing too much pyruvate from the high glucose levels in the body.
The correct answer to this question is B. Muscles are building up lactate from anaerobic respiration
Answer:
B. Muscles are building up lactate from anaerobic respiration.
Explanation:
During excessive physical activities such as sprinting, muscles carry out anaerobic respiration to compensate the need of ATP for their continuous contraction. It is done since oxygen availability can not meet the increased demand of ATP during excess physical activities. Anaerobic respiration in muscles converts pyruvate into lactate which in turn causes burning sensation in muscles. Hence, her symptoms are due to increased oxygen demand and buildup of lactate in muscles.
Even in an adult, some cells continue to divide. Why is cell division useful even in an adult who is no longer growing?
Cell division in fully grown adults is important for the replacement, repair, and regeneration of cells, aiding in the maintenance and repair of tissues. The process begins at the zygote stage and continues throughout life. Certain cells, such as stem cells, also have the unique ability to continue dividing and create new cells as needed to help maintain body health.
Explanation:
In a fully grown adult, cell division continues to play a crucial role in the repair and regeneration of tissues. This phenomenon begins from a zygote in sexually reproducing organisms where trillions of cell divisions occur to produce a complex, multicellular organism. Even when growth is complete, cell reproduction remains vital for replacing lost or damaged cells, such as skin cells and blood cells.
In addition, some cells like stem cells have the ability to continually divide and regenerate new stem cells rather than specializing, which helps in maintaining the body's health as it can give rise to different types of cells needed for tissue repair or replacement. For instance, adult bone marrow contains hematopoietic stem cells, endothelial stem cells, and mesenchymal stem cells, which produce various types of cells like red blood cells, white blood cells, and various types of muscle cells respectively.
Therefore, cell division in adults is primarily for the maintenance and repair of tissues, not for growth or increase in size unlike in younger organisms. Any irregularities in this regulated process can lead to adverse effects and diseases.
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Naturalistic observation is commonly used for anthropology studies. true or false
Answer:
Naturalistic observation IS commonly used for anthropology studies.
Explanation: