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snow_lady [41]
2 years ago
5

1. What force, created when two surfaces rub together,

Biology
1 answer:
Mnenie [13.5K]2 years ago
3 0

Answer:b friction

Explanation:

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What instrument do we normally use in our labs at school to observe microscopic things?
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A microscope!

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A microscope is used to magnify objects that are too small to be seen by the human eye. I hope this helps! :)

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3 years ago
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
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puteri [66]

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Explanation:

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3 years ago
a --------- ----------- factor impacts large populations and are often caused by overpopulation for example completion for food
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One of the answers could be emigration.

4 0
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