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labwork [276]
3 years ago
14

What is the theory of natural selection, and why does it occur in an organism? Give an example.

Biology
1 answer:
BlackZzzverrR [31]3 years ago
5 0

Answer:

It occurs in organisms because an organism with a beneficial trait/mutation have a higher chnace of surviving compared to organisms that do not. So the organsims that do survive pass on their genes to the next generation, and the bext generation will pass on those genes to the generation after and so on. But all the organisms that do not possess a beneficial trait/mutations will not survive, therefore they cannot reproduce and pass on those genes to their offspring. This means that most of the population will posses that trait/mutation.

Example: Spotted moths camouflage with bark so they are seen by predators and eaten. Black moths are easily seen by predators and are eaten. Spotted moths then pass on their genes to the next generation of moths.

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Scientists use biotechnology to create all of the following except __________.
kodGreya [7K]
Scientists use biotechnology to create all of the following except waste products. The correct answer is D. 
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3 years ago
Explain what, if any, is the issue facing DNA polymerase in regards to its 5’->3’ activity when replicating DNA.
Ymorist [56]

Answer:

The two strands of DNA are replicated in different ways

Explanation:

DNA replication is a process that occurs during the S phase of the cell cycle that consists of making two identical copies of the double-stranded DNA molecule, which subsequently are distributed in the daughter cells during cell division. During this process, DNA polymerase can add nucleotides in 5' to 3' direction, but not in 3' to 5' direction. In consequence, the DNA strand that has 3’ to 5’ directionality can be synthesized directly, while the DNA template strand that has 5’ to 3’ directionality can't be synthesized in a continuous manner and thereby it is created by adding small DNA fragments, which are known as Okazaki fragments (150-200 nucleotides in size).

4 0
2 years ago
Explain how environmental agents such as chemicals and radiation cause cancer.
Paul [167]

Chemical (mutagens) usually either mimic the structure of nucleotides and are inserted in DNA or either cause chemical changes  (such as alkylation) in nucleotides hence causing mismatching during replication. Radiation, on the other hand, (due to its high energy) causes double-strand breaks in DNA causing an increased likelihood of mutations during the repair of the DNA by cell mechanisms.






4 0
3 years ago
Please answer all i need help quick
svet-max [94.6K]

Answer:

1. B

2. B

3. A

4. B

Explanation:

1. Species is smaller than kingdom, and domain isn't a group

2. Its kinda obvious

3. Not too sure on this one, but i think a is right

4. Pro means 'before nucleus', therefore it has no nucleus

3 0
3 years ago
Which of the following applies to a viral infection? Viral infections Viruses can be treated with antibiotics. Viruses can only
Ne4ueva [31]

Viruses can only replicate with in a cell or living tissue applies to a viral infection.

Viral infections are infections that are caused by viruses. Viruses are microscopic organisms that contains a core of genetic material (DNA or RNA) enclosed by a protein coat. Viruses are not made of cells and they are very tiny and smaller than bacteria. Viruses require a living cell (host organism) to replicate and produce other viruses similar to them. Viral infections cannot be treated with antibiotics, antiviral medicines are used instead. Examples of viral infections include; common cold, flu, smallpox, HIV/AIDS and Ebola.


6 0
3 years ago
Read 2 more answers
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