What advantages does a skeleton made of cartilage offer the shark?
which Mineral properties depend on composition a. structure b. luster c. cleavage or d. streak?
How is the DNA in a prokaryote different from the DNA in a eukaryote?
A. Eukaryotes do not have alleles.
B. Only prokaryotes are diploid.
C. Prokaryotes do not have genes.
D. DNA is in a nucleus in eukaryotes.
Answer: The correct answer is D) DNA is in a nucleus in eukaryotes.
Prokaryotes are those organisms that lack a well defined nucleus and membrane bound subcellular organelles (like endoplasmic reticulum, golgi complex, mitochondria). The genetic material lies in the cytoplasm of the cell in these organisms.
Example - Bacteria like E.coli.
On the other hand, eukaryotes are those organisms that contain a well defined nucleus that possesses the genetic material (DNA). These organisms also contain membrane bound subcellular organelles.
Example - Plants and animals.
The DNA (Deoxyribose nucleic acid) of the eukaryotes is different from that of prokaryotic DNA based on their nuclear structure, a number of a chromosome, their binding protein, and selective permeability.
Further Explanation:
The difference between prokaryotic cells and Eukaryotic cells are listed in Table 1 attached below:
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Answer Details:
Grade: High School
Subjects: Biology
Topic: Structure of DNA
Keywords:
Eukaryotes, prokaryotes, chromosome, protein, cytoskeleton, membrane, histone, permeability, nucleus, condense, DNA, tetramers
If an original cell has the genetic makeup AaSs. What would the genetic makeup of the daughter cells be?
The genetic makeup of the daughter cells can include AA, Aa, aA, or aa with each possibility occurring with a 25% chance.
Explanation:When an original cell has the genetic makeup AaSs, the genetic makeup of the daughter cells can vary. This is because during the formation of gametes (eggs or sperm), the alleles for each trait separate randomly, according to Mendel's principle of random segregation. Therefore, the possible genetic makeup of the daughter cells could include AA, Aa, aA (which is the same as Aa), or aa, with each possibility occurring with a 25% chance.
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The creationist and evolutionist are in agreement on all of the following items except: cell complexity the role of certain organelles in cell chemistry the ability of matter to be self organizing the levels of organization of complex organisms
The creation-evolution controversy (also termed the creation vs. evolution discussion or the origins dispute) includes an ongoing, recurring cultural, political, and theological debate about the issues of the Earth, of humanity, and of other life. Within the Christian world, creationism was once widely considered to be true, but since the mid-19th-century evolution by natural choice has been verified as an empirical scientific fact.
Question:
The creationist and evolutionist are in agreement on all of the following items except:
• cell complexity
• the role of certain organelles in cell chemistry
• the ability of matter to be self organizing
• the levels of organization of complex organisms
Answer:
• the ability of matter to be self organizing
Explanation:
A creationist is a person who believes in the creation story. A creationist believes that life originated from a Creator( God) who made the heavens and the earth. A creationist believes God created human beings, fish, birds, and every other living organism on earth. This belief system is a religious belief.
An evolutionist believes in the the theory of evolution. An evolutionist believes that life develops millions of years ago due to the evolution of simple life forms present on earth.
A evolutionist believes that organisms evolves of change due to physical and behavioural characteristics that they inherited.
A creationist and an evolutionist disagree on the fact that matter is self organizing.
What happens to dna before cell division??
Harmful particles and gases in the air are known as ____________________.
Answer: Pollutant
Explanation:
Any undesired particle that is present in the environment is known as pollutant. These can be particulate matter or harmful gases that is present in the atmosphere.
These gases can be carbon dioxide( more than normal), carbon monoxide, sulfur dioxide, et cetera. Pollutants can be pollen grains, dirt and smoke which pollutes the environment.
Hence, undesired particles are known as pollutants.
Dolly, a female domestic sheep, was the first mammal to be cloned from a fully differentiated cell, using the process of nuclear transfer the nucleus of a _____________ is transferred into a cytoplasmic donor.
which term identifies the process used by the cell to bring in large molecules
Answer: The correct answer is- Endocytosis.
Endocytosis can be described as a process in which cell engulfs large molecules from the environment by fusing them with its cell membrane (plasma membrane).
Cell membrane is a selectively permeable, hydrophobic membrane. Large polar molecules ( such as proteins and hormones) can not pass through it by means of simple diffusion.
Cell performs endocytosis for taking in such large molecules.
In this process, plasma membrane first forms a pocket around the target molecule ( such as protein) through invagination and once it completely surrounds the molecule, it is pinched off in the cytoplasm in a form of food vacuole ( phagosome in case of solid particles).
Thus, Endocytosis is the right answer.
When a nerve impulse reaches the end of an axon, the neurons release ________________, chemicals that carries the signal across the synapse.
A. Action potential
B. Steriods
C. Neurotransmitters
Answer: The correct answer for the fill in the blank is- C) Neurotransmitters.
Neurotransmitters are the chemical messengers in the body that help in the transmission of signals from one neuron to another neuron across a gap called synapse ( such as neuromuscular junction).
These chemicals are released from synaptic vesicles that are present in the nerve endings and also from some glands (like adrenal gland and pituitary).
Example of neurotransmitters- Dopamine, acetylcholine, serotonin.
What data would you need to see in order to draw conclusions about the effectiveness of preventive surgeries?
The conclusion about the effectiveness of preventive surgeries can be drawn by gathering the data from the people who experience the surgery. The data would need the observations of the patients that had the surgery.
What are preventive surgeries?Preventive surgeries are those surgeries in which the tissues or organs or glands are removed from the body, even if they show no signs of cancer.
Preventive surgeries are done to prevent the development of cancer in the future. These surgeries are done on people who have a high risk of developing cancer.
Thus, data gathered from those who have undergone preventive surgery can be used to derive conclusions about their efficacy. The observations made by the surgical patients would be necessary for the data.
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In a DNA molecule, which nitrogenous bases are bonded together?
A purines with purines
B pyrimidines with purines
C pyrimidines with pyrimidines
Final answer:
In a DNA molecule, purines are bonded with pyrimidines. Adenine (A) bonds with Thymine (T), and Guanine (G) bonds with Cytosine (C).
Explanation:
In a DNA molecule, purines are bonded with pyrimidines. This means that Adenine (A), a purine, will always bond with Thymine (T), a pyrimidine. Similarly, Guanine (G), another purine, will always bond with Cytosine (C), a pyrimidine. The base pairs (A-T and G-C) are held together by hydrogen bonding, creating the double-stranded helical structure of DNA.
2. While looking at a cell under a microscope, a scientist is able to see a biological molecule. This molecule is a nucleic acid with a ladder structure and contains the nitrogenous bases adenine, thymine, cytosine, and guanine. Based on this information, what conclusion can the scientist draw regarding this nucleic acid?
(A)The nucleic acid is DNA and would be found in the cell’s nucleus.
(B)The nucleic acid is DNA and would be found in the cytoplasm.
(C)The nucleic acid is RNA and would be found in the cytoplasm.
(D) nucleic acid is RNA and would be found in the cell’s nucleus. ...?
The correct answer is A
The scientist can determine that this nucleic acid is a DNA molecule, because it contains Thymine, which does not occure in the RNA molecule. The RNA molecule contains Adenine, Guanine and Cytosine just like the DNA, but unlike the DNA it contains Uracil, not Thymine.
Secondly, the scientist can say with certainty that this DNA molecule is surrounded by a nucleus based on the structure of the nucleic acid described. Only eukaryotic cells have ladder structure. The prokaryotic cells have circular DNA and do not have any organelles, like the nucleus. Therefore, from the ladder structure of the DNA the scientist can see that the cell has a nucleus.
In what different ways did people live in ancient China?
Answer:
Most of the people in ancient China were peasants, that is, people who work on farms, both cultivating and raising cattle.
Explanation:
Ancient China was one of the oldest civilizations in the world with continuity until today, it has its origins in the Yellow River basin, where the first Xia, Shang and Zhou dynasties arose. The existence of written documents about 3,500 years ago has allowed the development in China of a very precise historiographic tradition, which offers a continuous narration from the first dynasties to the contemporary age. The Chinese culture, according to the myth, opens with the three original emperors: Fuxi, Shennong and finally the Yellow Emperor Huang, the latter considered the true creator of the culture. However, there are no historical records that demonstrate the real existence of these personalities, which according to the oral transmission from generation to generation, would have lived about 5000 to 6000 years ago.
The traditional Chinese storytelling is based on the so-called dynastic cycle, whereby historical events are explained as the result of successive dynasties of kings and emperors who go through alternate stages of boom and bust. This model of the dynastic cycle has been criticized by many authors1 for two fundamental reasons: First, for its simplicity, since the model adopts a recurring pattern according to which the first emperors are heroic and virtuous, while the latter are weak and corrupt This vision is undoubtedly influenced by the interpretation of the reigning dynasties themselves, which found in the degradation of the preceding dynasty a legitimation of their own rise to power. Second, the dynastic model has also been criticized for presenting an artificial nationalist vision, because what in an alternative interpretation could be seen as a succession of different states and civilizations in the same territory, appears as a mere alternation of government regimes in the unperturbed framework of a single national entity.
Vines growing up a wall is an example of _____.
phototropism
thigmotropism
gravitropism
hydrotropism
Vines growing up a wall is an example of thigmotropism.
What is thigmotropism?
Thigmotropism is the movement or change in orientation of a plant’s growth as a reaction to touch. The orienting factor is generally a hard surface that can change the direction of the plant’s growth or the growth of one of its organs.Thigmotropism can be in the form of opening or closing of parts of the plant such as the petals or leaves, the coiling of the plant around the surface, as well as other ways.
Why other options are incorrect?
Phototropism is incorrect as it relates to light.Gravitropism is incorrect as it relates to gravity.Hydrotropism is incorrect as it relates to water.Hence, vines shows movement it is an example of thigmotropism.
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Why is a year on saturn so much longer than a year on earth?
HOW DEEP IS THE CENTER OF THE EARTH?
Describe the similarities and differences between a bats wing and a birds wing.
Which of the following did not occur during the Cenozoic era?
A. Climate change
B. The formation of the ozone layer
C. Volcanic outgassing
D. Advancing ice caps
Answer:
Option (B)
Explanation:
When the initially occurring aquatic organisms such as the blue-green algae started to use the solar energy in order to convert the water molecules and carbon dioxide and converting them into organic compounds as well as the molecular oxygen (O₂). This is known as the photosynthesis process that produced a significant amount of oxygen in the atmosphere. These oxygen molecules, as absorbs the UV radiations emitted from the sun, it breaks the oxygen molecules and forms a single atom of oxygen. These atoms then again is added to the molecular oxygen and forms the ozone (O₃) molecule.
This is how the ozone layer has formed about 2 billion years ago.
Thus, the ozone layer did not form during the Cenozoic era.
Hence, the correct answer is option (B).
why is the longer chromosome pair used to model crossing over?
The reason is because using a longer chromosome pair would help the learner to see the pattern in the spread out
Explanation;Cross-over is the process that takes place in meiosis process of cell division, where a cell in the gonads divides in two phases to yield four daughter cells that have half the genetic composition as the parent cell.Cross-over occurs in prophase I of meiosis I, where non-sister chromatids of the homologous chromosomes joins at a point called chiasmata and exchanges the segment of chromatids, this ensures genetic variation among organism. Using longer chromosome to show the model of cross-over ensures that the pattern in the spread out is clearly visible to the learner.Of the following types of transport, which two may the cell utilize if a large molecule or organism cannot pass through the membrane?
active transport
passive transport
pinocytosis
facilitated diffusion
phagocytosis
Answer: Phagocytosis and pinocyotosis.
Explanation:
Endocytosis is a cellular process in which the substance are bought into the cell. It can be food, dissolved particles, damaged cell, et cetera.
It consists of pinocytosis and phagocytosis. The material that has to be ingested inside the cell is surrounded by the area of the cell membrane, which turns into a vesicle that contains the ingested material.
The Pinocytosis can be defined as cell drinking and phagocytosis can be defined as cell eating.
What are the major factors that influence the rock cycle
Hormones; cholesterol. Which group of lipids represents steroids? A)notable structure=fused rings- presence of deferent functional groups leads to different functions B) Fatty Acid replaced with phosphate Amphiphathic C) one glycerol and three fatty acids- no double bonds between carbons D) one glycerol and three fatty acids- at least one double bond
Option A-
notable structure = fused rings
how can what you see can impact other human body systems?
The circulatory, or cardiovascular system, is composed of
a. heart, arteries and veins.
b. lungs, heart and brain.
c. heart, blood and blood vessels.
d. lungs, blood vessels and heart.
The circulatory system is composed of blood vessels that take blood apart from and towards the heart. Arteries move blood aside from the heart and veins bring blood back to the heart. The circulatory system offers oxygen, nutrients, and hormones to cells, and eliminates decay products, like carbon dioxide.
Indicate why the hapmap project is useful in diagnosing human disease
What always affects measurement error in an experiment?
A.investigator bias
B.variability in nature
C.instrument precision
D.misreading the instrument
How much of the worlds water is saltwater? A. 97.5%. b. 50% C.25% D. 2.5%
Specialized cells in plant roots ensure that they grow down into the soil to find water and nutrients. This plant response by specialized cells is called
This plant response by specialized cells is called gravitropism.
Gravitropism is the growth of a plant’s organ in response to gravity. In the root cap of plants, there are specialized cells known as statocytes that contains granules known as statoliths which stimulate the production of auxin; a hormone that is important for controlling plant growth. Plants have the ability to sense gravity with the aid of these specialized cells and plant roots grow downward into the soil while stems grow in the opposite direction.
A confined aquifer is _____.
A) found in the unsaturated zone
B) found between two impermeable layers
C) the top layer of the saturated zone
D) separated from the main groundwater
Aquifers are underground layers of rocks which contain water and serve as important sources of freshwater. They are located below the water table and in the saturated zone. If an aquifer becomes trapped between two impermeable layer (for example, one below and one above that overlies the aquifer), the pressure act on the aquifer and it can become a confined aquifer.
A confined aquifer is found between two impermeable layers.