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djverab [1.8K]
3 years ago
10

Under what circumstances does membrane transport always require energy?

Biology
1 answer:
kondor19780726 [428]3 years ago
8 0
It requires energy when a substance must travel against a concentration gradient through the membrane
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Predict how an ecosystem would respond if either its producers or decomposers
krok68 [10]

Answer:

The ecosystem would collapse if producers were removed.

Explanation:

The primary consumers populating would decrease due to lack of food and if a species doesn’t have food they most likely won’t reproduce. The secondary consumers won’t have enough food either because their prey being the primary consumers would die off. All this leads to the down fall of ecosystem.

5 0
3 years ago
Are fibrous proteins heavier than globular proteins in terms of molecular weight? Why?
quester [9]

Answer:

Proteins range in molecular weight from 1000 to more than 1 million daltons (Da), but the folded size of a globular protein is not necessary correlated to its molecular weight. Proteins composed of about 250 amino acids or less often have a simple, compact globular shape. Larger globular proteins are usually made up of two or more recognizable and distinct structures, termed domains or modules. These are compact, folded protein structures that are usually stable by themselves in aqueous solution. Typical domain structures consist of hydrophobic cores with hydrophilic surfaces. Individual domains often possess unique functional behaviors and often perform unique functions within the larger protein in which they are found.

3 0
2 years ago
A man is brachydactylous (very short fingers; rare autosomal dominant), and his wife is not. Both can taste the chemical phenylt
netineya [11]

Answer:

The correct answer is -

A) BbTt x bbTt

B) .5^4 or 1/16 or 0.0625

Explanation:

As it is given that Brachydactylus and PTC tasters both traits are autosomal dominant conditions which mean only one allele would be enough.

For Branchydactylus and For tasting :  man and women will be heterogeneous.

Hence,

The Genotype of man = BbTt

The Genotype of wife = bbTt

b. Answer = 0.0625

For Branchydactylus:

Bb X bb

Possible genotypes:

B b

b Bb( Brachydactylus) bb(normal)

b Bb (Brachydactylus) bb (normal)

The probability of a single child being Branchydactylus = 2/4 = 0.5

So,  Probability of all 4 child being Branchydactylus = .5 x .5 x .5 x .5 = 0.0625

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2 years ago
Question 18 of 25
kakasveta [241]
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What are the relative sizes of oocytes in a dormant follicle, a growing follicle, and a graafian follicle?
Kamila [148]
Dormant oocyte 1X, growing oocyte 5X, mature oocyte 25X. Tb primary oocyte is approximately 25 micrometers in diameter. After growth, the growing oocyte will reach 200 micrometers in diameter, and eventually, the mature oocyte could reach 2 centimeters in diameter, in humans.
3 0
3 years ago
Read 2 more answers
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