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SVETLANKA909090 [29]
3 years ago
7

Cells need energy in order to ________?

Biology
2 answers:
oksian1 [2.3K]3 years ago
7 0
D. All of the above.
lyudmila [28]3 years ago
4 0
C, reproduce.

Explination: cells don’t make molecules so we can rule that one out.
They don’t really change shape either. So the only option is C.

C is correct because cells use energy to reproduce through mitosis
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When two adjacent bases in the same strand of DNA dimerize (form a covalent bond between them), what happens to the DNA?
kondaur [170]

The DNA of every higher organism consists of two strands which are joined together through bonding between nitrogenous bases. We know well that the base of one strand forms hydrogen bond between the base of the other strand to hold the DNA intact. Thymine always pairs with Adenine and Guanine always pairs with Cytosine, this way an intact and normal DNA structure is formed.

However, sometimes the Ultra violet (UV) rays cause serious damage to DNA. When UV rays are absorbed by DNA, where the bases are thymine or cytosine they add energy at that point. This energy causes the formation of covalent bond between adjacent cytosine- cytosine or thymine-thymine bases of same DNA strand (Please see attached figure). This abnormal process is called the formation of Pyrimidine dimers.  

What harm they can incur to us?

Our body cells have excellent DNA proofreading mechanisms that correct the errors in DNA. But sometimes when DNA has to replicate, the dimers don’t let the DNA polymerase enzyme to correctly read DNA strand because there are abnormal structures. The enzyme incorporates wrong base, at the position of dimers for example if C-C dimer is present, adenine instead of guanine will be added at that position. This causes the presence of incorrect base in newly synthesized DNA.  

This process leads to mutation in the cells which is very common cause of increased risk of cancers nowadays.


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3 years ago
Pick two ways do salts enter the ocean.
netineya [11]
I think the answer is 3 and 4
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3 years ago
Explain the relationships between five members of a food web. Include at least one producer and one high-level consumer
kolezko [41]

Answer:

the sun shines on earth, which through photosynthesis in a humble blade of grass turns into food and energy for the grass. now a small mouse hops along, stomach growling. it eats our blade of grass now itself getting energy. the naive, full mouse hops through the field before it squeaks in horror. a snake slinks towards it. the mouse is too slow. and the mouse breathes his last breath. the snake swallows it whole. stomach content now digesting its new energy sleeps. before it has the chance to react a hawk snatches it up in her claws. killing it she eats. this snake is poisonous, the next time our hawk flies, she stumbles, then falls. vanquished by poison her lifeless body lies in the dirt. her nutrients go into the soil, thanks to decomposers like worms. her nutrients help new grass blades grow, and the cycle continues.

I hope this helps u!

Pls give brainliest(had 40 down to 2 for no reason and worked long) and a thx ;)

I will thank u via profile thanks and comments

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The gene responsible for lactose persistence among adults in Europe is a regulatory gene.
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