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tatiyna
2 years ago
9

Why is a cell membrane important in the defense of a cell

Biology
1 answer:
Gnoma [55]2 years ago
4 0
Because the cell membrane controls what enters and leaves the cell. It also gives the cell support and protection and helps maintain homeostasis. Hope it helps you
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If thymidine dimers created by UV irradiation persist until DNA replication, DNA polymerase is likely to make a mistake reading
marishachu [46]

Answer:

Thymidine dimers is likely to be repair as soon as it is originated but if left unrepaired then it causes  frame shift mutations.

Explanation:

In case of Bacterium if UV irradiation induces covalent linkage of two thymidine present adjacently to each other or on a single strand to make thymidine dimers.

These either excised via DNA repair enzyme like Endonuclease V and the proof reading activity of DNA polymerase I enzyme help in incorporation of nucleotide by taking the unmutated original strand as a template.

These dimers if not excised before second round of replication than the sequence of newly synthesized strand will be altered. As DNA polymerase III enzyme read thymidine dimers as single thymidine nucleotide and incorporate only 1 adenine in the newly synthesizing complementary strand which results in frame shift mutations

It is the mutation in which reading frame of codons is shifted or altered due to deletion or addition of a single nucleotide.

7 0
2 years ago
The "photo-" part of the word photosynthesis refers to the _____, whereas "-synthesis" refers to ____
Debora [2.8K]

Answer:

1. Light

2. production of large component from smaller components

Explanation:

In the given question, the meaning of the word Photo is light and the synthesis refers to the production and combining these words form photosynthesis. The literal meaning of photosynthesis will be the production of some compounds in the presence of light.

The word photosynthesis is used by the biologists to refer to a process taking place in the green plants which involve the light for the synthesis of energy-providing molecule glucose.

Thus, 1. The light and production of the large components are correct.

5 0
3 years ago
How can reading through the entire investigation before beginning the
hammer [34]

Reading through the entire investigation before beginning the procedure can help prevent accidents by giving you the knowledge of what to do beforehand and preparing you for what is to come.

7 0
3 years ago
What animal produces cashmere wool?
Pavlova-9 [17]
Any animal that has alot of thick fur can produce  cashmere wool.
3 0
3 years ago
"as an adult, your brain has fewer synapses than it had when you were 2 years old"
Liula [17]
That is incorrect your brain has same amount of synapses
5 0
3 years ago
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