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Alex_Xolod [135]
3 years ago
10

DNA strand replication begins with an RNA primer. DNA strand replication begins with an RNA primer. True False

Biology
1 answer:
nikitadnepr [17]3 years ago
6 0

Answer:

true

Explanation:

DNA synthesis is performed by the enzyme DNA polymerase. However, DNA polymerase requires the presence of a free 3' OH on the existing DNA or RNA segment. The enzyme primase forms small RNA segments that serve as primers. Primers are formed by using the DNA template strands and have free 3' OH ends. DNA polymerase extends the primers by adding deoxyribonucleotides according to the sequence of the DNA template strand. Therefore, DNA polymerases are the enzymes of primer elongation.

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Chronic exposure to nicotine desensitizes _______ receptors in the midbrain.
Nikitich [7]
<h2>Nicotinic ACh</h2>

Explanation:

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6 0
2 years ago
Which of the following is NOT a membrane-disrupting toxin?
Vaselesa [24]

Answer:

Answer is A-B toxin.

Explanation:

A membrane-disrupting toxin is toxin that affect the cell membrane. The effect of its secretion  could be by interrupting the phospholipid layer or through pores formation on the membrane.

Membrane- disrupting toxins are regarded as  exotoxins. Examples are leukocidin and hemolysin which their effects cause leakages of the cytoplasmic content and lysis of the cell, through the formation of pores on the cell membrane.

The A-B toxin are produced by the proteins of pathogenic organisms such as the bacteria. Example is botulinum toxin.

3 0
3 years ago
PLEASE HELP!! WILL REPORT YOUR ANSWER IF IT IS CHILDISH! DEAD SERIOUS...
attashe74 [19]

Answer:

oh ok i think i know it

Explanation:

umm bro is this a quetion or a essay

5 0
2 years ago
How do daily human activities effect the ecosystem?
mel-nik [20]

things that we do daily such as driving for example, has an effect on our ecosystem. Driving pollutes the air in our ecosystem and uses up gas and diesel resources.

8 0
3 years ago
Which muscle group works the hardest isometrically when performing a wrist curl in pronated position
klemol [59]
I am pretty sure that would be <span>wrist flexors</span>
7 0
3 years ago
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