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Sergeeva-Olga [200]
3 years ago
7

Which best describes why the cell membrane is selectively permeable?

Biology
1 answer:
alukav5142 [94]3 years ago
6 0

Answer:

The answer is It allows only certain materials to enter and exit the cell.

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During the second trimester, a pregnant woman needs an additional _______ kcal per day.
FrozenT [24]
I believe that during the second trimester, a pregnant woman need an additional 350 kcal per day.  Dietary intake during pregnancy must provide energy that will ensure the full term delivery of a healthy newborn baby of adequate size and appropriate body composition. A pregnant women requires additional energy for the fetus and that explains the reason for the additional energy requirement. 
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How could the use of fossil fuels affect the biodiversity in neighborhoods and the surrounding ecosystems?
Kisachek [45]

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The entire process of converting fossil fuels to usable energy creates both direct and indirect impacts on biodiversity. Extraction of fossil fuels through various means such as coal mining, installation of pipelines, and construction of roads leading to the mining site causes direct damage to natural ecosystems

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How would a scientist study the relationship between the Tiktaalik roseae and modern fish and tetrapods?
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Explain why the precise length target DNA sequence doesn't get amplified until the third cycle. You may need to use additional p
shusha [124]

When you start the PCR amplification reaction, you have a template which has sequences where the primers will anneal. The forward primer anneals in the sense strand and the reverse one in the complementary sequence (see attached figure).

After the first PCR cycle, two types of fragments are obtained. First those which come from tha 5'-3' sequence, that are 3'-5' and will anneal the reverse primer in the following cycle. This fragments have the correct 3' end, but the 5' includes part of the template that doesn't correspond to our target (see attached figure)

Second, those fragments that come from the 3'-5' sequence, that are 5'-3' and will anneal the forward primer. This fragments also have the correct 3' end, but the 5' includes part of the template that doesn't correspond to our target (see attached figure).

Now, during the second cycle, are produced the first fragments that have the precise length of the sequence that we want to amplify (see attached figure).

So, it's not until the third cycle that the reaction starts amplifying exactly the sequence of desired length.

3 0
3 years ago
If exhibited by an expectant father, what is a warning sign of ineffective adaptation to his partner's first pregnancy?
Sergio [31]

Answer:

Consistently changes the subject when the topic of the fetus/newborn is raised.

Explanation:

This is the decision of the couple whether they want a child or not and can discuss about the family planning as well. Different psychological aspects acn explain this matter.

The expectant father is not mentally prepared for the child. He might refuse the talks and stay away from the communication that are related to the new born child. This must be properly assessed and important to understand the feeling of the expectant father.  

Thus, the answer is consistently changes the subject when the topic of the fetus/newborn is raised.

4 0
3 years ago
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