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juin [17]
3 years ago
13

What would be the first step in using PCR to copy a gene?

Biology
1 answer:
user100 [1]3 years ago
3 0
The best answer is C - DNA is heated to separate the strands. PCR proceeds in three steps. 1. Denaturation - The DNA strands, which are bound together in the double helix, must be separated to allow replication to take place so the first step of PCR is to separate them. This is done by heating up the sample, breaking the hydrogen bonds between the strands. 2. Annealing - sample is cooled just enough to allow primers to bind to the ends of each of the two template strands. 3. Extension - DNA polymerase attaches to the primers and makes a copy of each template strand.
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Most of the rock material that we see on a daily basis falls into which category of rocks?
In-s [12.5K]

Answer:

Your answer is A) Sedimentary. The rocks and pebbles you see on a daily basis are most likely limestone, which is an abundant sedimentary rock.

4 0
3 years ago
Why are ecological pyramids shaped as pyramids?
REY [17]
The answer is A
This is because 90% of energy is lost when we go up one trophic level. This means that even the the consumers tend to be larger in size, they are fewer in number and need to eat more in order to sustain themselves.
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4 years ago
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If you walk through a busy crowd and feel a few different people bump and push past you as they walk by, which skin receptors wo
Likurg_2 [28]

Answer:

Mechanoreceptors would be activated

Explanation:

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5 0
3 years ago
What are Constant/control variables
Alik [6]

Answer:

constant = changes and control is used as the basis of comparison

Explanation:

Constant variables are variables that do not change

e.g such as the temperature ( if it's meant to be kept at a constant temp).

Control variables are meant to be kept constant to allow for a comparison and thus determine the effect of IV (independant variable) and DV ( dependant variable)

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3 years ago
Item 2 In which sphere does a dolphin swim?
Romashka-Z-Leto [24]

Hydrosphere

Explanation:

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  • The hydropshere is the region occupied by water on the earth surface.
  • They are the oceans, lakes, rivers, glaciers e.t.c
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  • Ocean occupies a whooping 95% of all.
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Learn more:

Atmosphere brainly.com/question/1851697

#learnwithBrainly

5 0
3 years ago
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