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ivann1987 [24]
2 years ago
8

Which statement best describes the role of the cell membrane?

Biology
2 answers:
aalyn [17]2 years ago
7 0
A. It encloses the cytoplasm
kogti [31]2 years ago
7 0
The answer is A!
Hope this helped
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At one time, there were many more cheetahs than there are today. About 10,000 years ago, a change in
Ierofanga [76]

Answer:

<u>the bottleneck effect</u>

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Explanation:

Genetic drift has an important impact on the small populations. mutations, which are spontaneous heritable changes in the genetic code, made up of DNA. Here, mutations accumulate over time in a group, modifying the distribution of alleles or various forms of a gene. Natural selection may result in a loss of diversity in a population called genetic drift; one trait's allelic frequency rises while others become less prevalent. Typically such differences exist because of occurrences of mutation and recombination.

Some mutations or alleles may become extinct from the population.

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Variants of a gene accumulate and are transmitted across generations; the frequencies of these occurrences are altered and become more stable in genetic drift- they become genetically distinct and may eventually form a new species after isolation. This may be further compounded through other  phenomena such as the founder effect where a group separates and genetic diversity decreases; and the bottleneck effect where barriers to reproduction or the die-off a population increases genetic drift.

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6 0
3 years ago
What five intermolecular forces of attraction are important for tertiary structure?
andreev551 [17]
Hydrogen bonding, ionic bonding, dipole-dipole interactions, and London dispersion forces!
7 0
1 year ago
Read 2 more answers
Will give the brainliest!
Alexxx [7]
<h2>°·.¸.·°¯°·.¸.·°¯°·.¸.->    Answer     >-.¸.·°¯°·.¸.·°¯°·.¸.·° </h2>

When heat is added to a solid, its particles move _______

A. faster

B. slower

C. closer together

<em>D. the same speed</em>

<h2>(っ◔◡◔)っ ♥ Answer ♥</h2>

A. (I THINK-)

<h2>Explanation</h2>

When heat is added to an object, the molecules vibrate faster. As they go faster, there is more space in between the molecules.

<h2>¸,ø¤º°`°º¤ø,¸¸,ø¤º° Details °º¤ø,¸¸,ø¤º°`°º¤ø,¸ </h2>

Subject: Science

Unit: Atoms, Molecules,

Grade: 5-7

(I think I might be wrong-)

4 0
3 years ago
How many planets are in the Solar System? 7 8 9 10
Stolb23 [73]

Answer:

8 Planets

Explanation:

3 0
2 years ago
Read 2 more answers
Describe the key features of the Watson-Crick model for DNA structure.
vagabundo [1.1K]

Answer:

Watson and Crick proposed the double helical model of DNA.

Explanation:

- This model says that DNA exist as double helix. It has two polynucelotide strands running in opposite direction i.e the strands are anti-parallel.

- Each polynucleotide strand is made up of several nucleotide liknked together by phophodiester bonds.

- The two strands are not coiled upon each other but the double strand is coiled upon itself around a common axis like the spiral stair case. Here base pairs forms the stairs and backbone of two strands form railing. Back bone contains sugar and phosphate.

- The base pairing is specific, adenine always pairs with thymine and guanine always pairs with cytosine. Thus if we see any base pair, it consists of one purine and one pyrimidine.

- The two strands of DNA thus show complementary base pairing.

- The strands are held together because of hydrogen bonding between the bases in opposite strand.

- One full helical turn involves ten base pairs and the base pairs are stacked  3.4 A apart.

- This form is called as B-form of DNA.

5 0
3 years ago
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