Answer:
The correct answer is ''complementary pairing of bases''
Explanation:
The double-stranded DNA with the complementary nitrogenous bases that are located inwards and establish non-covalent bonds (or attractive forces) to each other that maintain the structure of the molecule. Deoxyriboses (sugars) and phosphate groups constitute the columns of the molecule. When the cell divides, each new cell that is formed must carry all the genetic information that determines its characteristics and functions. For that, before dividing, DNA must replicate, that is, generate a copy of itself. During replication, the DNA molecule unwinds, separating its chains. Each of these will serve as a template for the synthesis of new DNA strands. The double-stranded DNA structure proposed by Watson and Crick (1953) suggested several important properties of the hereditary material: Complementarity rules of the nitrogenous bases A-T and G-C suggest a simple way of replication of the hereditary material. This simple form of replication is called a semi-conservative method. When DNA replicates, its two helices separate and each one of them serves as a template to synthesize a new helix following the pairing rules of nitrogenous bases.
In addition to mutations, genetic variation can also arise during the formation of gametes during meiosis. During meiosis I, homologous chromosomes can randomly exchange segments, in a process called crossing-over. This trading changes the order of the genes in the DNA and on the chromosomes. Exchange material is integrated into the rest of the chromosomes DNA. Each chromosome loses some DNA and gains some DNA. As a result, there are more genotypes in the offspring. 2. What function does recombination by crossing-over have in genetic variation
Answer:
Crossing over ensures that organisms of the same parents have differences in genetic content making them unique in one way or the other.
Explanation:
This question is describing the process of crossing over, which occurs only during prophase I of meiosis. During the process of crossing over, alleles of a gene are exchanged between non-sister chromatids of homologous chromosomes (mother and father chromosomes).
Hence, a unique GAMETE that has been genetically recombined will be formed. When these gametes are fertilized (egg) or fertilizes (sperm), organisms that are genetically different from their parents are produced. This ensures genetic variation, which is a difference in the genetic content of organisms.
Hey, can someone please help me with this real quick
Which of the structures in the diagram is labeled by number 8? *
O perimysium
O muscle fiber
Otendon
O blood vessel
O endomysium
It's tendon.
Tendon is a connecting tissue that connects bones and muscles.
Which of the following cells is NOT an antigen presenting cell?
B-Cells
Dendritic cells
Macrophages
T-Cells
Answer:Dendritic cells Explanation:
T- cells is not a antigen presenting cell.
What are T-cells?"T cells are part of the immune system and develop from stem cells in the bone marrow."" They help protect the body from infection and may help fight cancer."What is antigen presenting cells?"An antigen-presenting cell (APC) is an immune cell that detects, engulfs, and informs the adaptive immune response about an infection."It includes macrophages, dendritic cells and B- cells.Hence, the answer is T-cells.
To learn more about antigen presenting cells here
https://brainly.com/question/13588471
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Help me, it's due today
A tornado strips out a section of a forest. What type of succession is this? Why?
Answer:
Secondary succession
Explanation:
A secondary succession is when a type of disturbance happens when there is already soil present. In this case, it has already started out with a forest (including plants, trees, and wildlife). Other examples of a secondary succession include a wildfire, hurricane, flood, or human destruction.
This is different from a primary succession. A primary succession occurs when there is no soil present.
Upon close examination of the skeleton of an adult python, a pelvic girdle and leg bones can be
observed. These features are an example of
a. artificial selection
b. homologous structures
C. vestigial structures
d. comparative embryology
Answer:
vestigial structure that is C
More than 1.5 million species of animals have been described, yet all of them have DNA that is made of the same building blocks. This is evidence that all animals have a _________ ancestor.
Answer:
common or single is the answer
What term describes the biological burden on the body caused by emotional upset?
I believe its allostatic load which is the wear and tear on the body that accumulates when we are under a lot of stress
Help me with this please. I’ll give brainliest
Answer:
The answer to the question is amplitude
Explanation:
This is the answer to the question because a month ago I took the quiz and I got the question. Amplitude doesn't relate.
disadvantages of parthenocarpy to the plants
Answer:
-Seedless fruits can not be used to produce new progeny of any plant.
-Parthenocarpy is undesirable in nut crops because the seed is the edible part.
-Quality and Size of fruits get changed in case of Parthenocarpic fruits as compared to the normal state.
Explanation:
Canada's laws are made by the government which includes?
Question 4 options:
Parliament and a prime minister
monarch
General public demands
general rebulic
Answer:
and that they have the Queen as the some sort of importance of the common wealth
Mosses are an example of which of the following?
decomposers
heterotrophs
autotrophs
detritovores
primary consumers
Answer:
mosses are autotrophs
Explanation:
-
4. Which of the following is the most likely result of a non-native generalist species being introduced into an ecosystem?
a. Without natural predators, the species may outcompete native species.
b. The species will have no food sources and will not survive.
c. Extinction of the species will be likely throughout its range.
d. The species will cause changes in ballast water.
which factors have approximately 50% of the affected species being listed as threatened according to the graph select all that apply
Answer:
A.B.E.
Habitat Loss
Toxins and Pesticides
Invasive Species
Explanation:
I just took USA Test prep. I know its a late response but they said thats the rignt answer.
Match the following. 1. tetanus rickettsia 2. Rocky Mountain spotted fever malaria 3. drinking water rabies 4. decreased body temperature lockjaw 5. animal bite hypothermia 6. mosquito potable
decreased body temperature lockjaw
animal bite hypothermia
tetanus rickettsia
drinking water rabies
mosquito potable
Rocky Mountain spotted fever malaria
Explanation:
thats the order it won’t let me put the numders
Question 32
2 pts
Which of the following is true about horns and antlers?
Antlers are permanent and are made of hair.
O None of the other answers are correct.
O Horns are shed yearly and are made of hair.
O Antlers are shed yearly and are made of bone.
Horns are shed yearly and are made of bone.
Answer: C
Explanation:
Kinda common knowledge. Reindeer have antlers and they shed yearly
Why might cell division occur?
A. To provide energy for body functions.
B. To make more cells, to grow, and to repair damaged tissue
Answer:
Its B...........
..............
Answer:
B
Explanation:
Mitosis occurs when the tissue is tearing, for example if you have a paper cut, mitosis will repair the damaged cells. Energy in the body is a completely different process that has to do with the pancreas making insulin and glucose.
A chemist wants to show how the molecular structures of the major greenhouse-effect contributors allow them to
absorb heat.
Which of the following would the chemist not be modeling?
A) carbon dioxide
B) carbon monoxide
C) chlorofluorocarbons
D) nitrous oxide
E) methane gas
Answer:
Option C is the correct choice
Explanation:
The major contributor of green house effect are
a) Carbon dioxide (CO2)
b) Carbon Mono-oxide (CO)
c) Nitrous oxide
d) Methane
e) Ozone
The chlorofluorocarbons (CFCs) is a man made green house gas and hence the chemist will not model it as it does not allow to absorb heat. Instead it leads to non ending chain reactions with the ozone layer thereby degrading it and hence allow entry of harmful UV rays.
Option C is the correct choice
Please state some examples of fungus.
Answer:
Examples of fungi are yeasts, rusts, stinkhorns, puffballs, truffles, molds, mildews and mushrooms.
What are 2 ways nitrogen becomes useable to plants,humans,and animals?
Animals get the nitrogen they need by eating plants or other animals that contain nitrogen. When organisms die, their bodies decompose bringing the nitrogen into soil on land or into ocean water. Bacteria alter the nitrogen into a form that plants are able to use.
What are the characteristics of the outer planets? (Check all that apply)
Small
Rocky
Made of gas
Large
High density
Low density
Rocky , made of gas , low density , small
hope it is helpful to you
Which of the following is NOT a function of an antibiotic?
A. targeting the ribosome that inhibits protein synthesis, causing the cell to not function correctly
B. attacking the mitochondria, inhibiting the production of sugars that give the cell energy
C. inhibiting the production of the cell wall and breaking down what is present
Answer:
B. attacking the mitochondria, inhibiting the production of sugars that give the cell energy
Explanation:
Antibiotics can't attack on the mitochondria of the cell because mitochondria provides energy to the cell. Mitochondria is also known as power house of the cell means that it provides energy to the cell in order to continue its activities. If antibiotic attack on mitochondria of the cell, the cell has no energy for performing its activities that leads to cell death so that's why we can say that antibiotic can't attack on the mitochondria of the cell.
What time of year does everywhere on Earth receive an (almost) equal amount of daytime sunlight? Why does this occur?
Answer:
September Equinox
Explanation:
it occurs when the sun crosses the celestial equator from north to south
After proteins are made, they must be
sorted and packaged in preparation for
use by the cell. Where does this take
place?
A. endoplasmic reticulum
B. cell wall C.Golgi bodies
Describe the role of each of these white blood cells:
• T cells:
• B cells:
Answer:
B cells are at the centre of the adaptive humoral immune system and are responsible for mediating the production of antigen-specific immunoglobulin (Ig) directed against invasive pathogens (typically known as antibodies).
Explanation:
T cells are a part of the immune system that focuses on specific foreign particles. Rather than generically attack any antigens, T cells circulate until they encounter their specific antigen. As such, T cells play a critical part in immunity to foreign substances.
Answer:
T cells are responsible for cell-mediated immunity.
B cells are responsible for humoral immunity or antibody production
Explanation:
i got it right
why do organisms need both processes?
Answer:
The products of one process are the reactants of the other. Together, the two processes store and release energy in living organisms. The two processes also work together to recycle oxygen in Earth's atmosphere.
Explanation:
The products of one process are the reactants of the other. Together, the two processes store and release energy in living organisms. The two processes also work together to recycle oxygen in Earth's atmosphere.
Mendel examined many crosses involving traits found in pea plants. He identified being tall as dominant (T)
and short as recessive (t). What is the genotype of a heterozyous tall plant?
Answer:
Tt
Explanation:
Heterozygous means the organism has two different alleles, one for tall and one for short.
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Bloodworms, which are the mature larvae of non-biting midge flies, are commonly found in and around bodies of water. Most types of bloodworms can live only in pollution-free, oxygen-rich environments. However, a few species thrive in environments with low concentrations of oxygen and high concentrations of nutrients and pollutants. From the changes in the bloodworm populations shown in the table above, what can be determined about how water in the stream has changed?
A. The water has become less polluted, as evidenced by the decrease in the number of bloodworm species present and the increase in bloodworm population density.
B. The water has become more polluted, as evidenced by the decrease in the number of bloodworm species present and the increase in bloodworm population density.
C. The water in the stream has become less nutrient-rich, as evidenced by the increase in bloodworm population density.
D. The water in the stream has become more oxygenated, as evidenced by the increase in bloodworm population density.
Answer:
B
Explanation:
The water has become polluted,as evidenced by the decrease in the number of bloodworm species
The chart below is a taxonomic key for the fictitious insect genus
Problematica. To which species does the insect in the picture belong?
Select one:
A. Problematica differensis
B. Problematica brancus
C. Problematica cantrellis
D. Problematica alva