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bonufazy [111]
3 years ago
15

Write in the vocabulary term for each definition given. All your terms should be in lower case. The cell membrane is considered

because it only allows certain compounds to travel through freely.
Biology
1 answer:
lana [24]3 years ago
6 0

Answer:

The cell membranes are <u>Selectively permeable</u> or <u>semi-permeable.</u>

Explanation:

The cellular membrane allows the free passage of only a few substances while it blocks the pass of others.

Cellular membranes are <em>composed mostly of lipids arranged with their hydrophilic polar heads facing the exterior and the interior of the cells, while their hydrophobic tails are against each other</em>, constituting the internal part of the membrane.

Through this lipidic bilayer, some molecules can move from one side of the cell to the other. This free movement is called simple diffusion, and it depends on the substances' sizes and their concentration on each side of the membrane.

The membrane is selectively permeable because it only let small substances to move through it, with no protein mediating their passage.

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Much of the coordination of vertebrate body functions via chemical signals is accomplished by the ________.
elena-s [515]

Much of the coordination of vertebrate body functions via chemical signals is accomplished by the endocrine system.

The endocrine system is an information system composed of hormonal feedback loops that are secreted directly into the circulatory system by the body's endocrine glands and regulate distant target organs.

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The study of the endocrine system and its disorders is called endocrinology.

The glands that send signals to each other in sequence are often referred to as the hypothalamic-pituitary-adrenal axis.

In addition to the specialized endocrine organs mentioned above, many other organs that are part of other body systems have secondary endocrine functions such as bones, kidneys, liver, heart and gonads.

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5 0
2 years ago
The frequency of autosomal alleles K and k in a large population of snails is 0.6 and 0.4. What is the approximate genotypic fre
Flura [38]

Answer:

Option (b).

Explanation:

The frequency of alleles K and k in population are 0.6 and 0.4. The inbreeding coefficient is 0.3.

The heterozygote frequency can be calculated by the formula:

F = \frac{2Kk-H}{2Kk}

Here, K = 0.6, k= 0.4, F = 0.3 and H = approximate genotypic frequency of heterozygote Kk.

Put the values in the above formula

0.3 = \frac{2\times2\times0.6\times0.4-H}{2\times0.6\times0.4}

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Thus, the approximate genotypic frequency of the heterozygote Kk is 0.34.

Hence, the correct answer is option (b).

5 0
3 years ago
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