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Rainbow [258]
2 years ago
11

List two reasons why cells need to be small.

Biology
1 answer:
Sonja [21]2 years ago
3 0

Answer:

they need a high ‘surface to volume’ ratio, which is good for exchanging materials between the inside and outside of cells. But this is probably not really the size-limiting reason, since cells vary enormously in size and surface area to volume ratios.

Explanation:

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What embryo-produced hormone maintains progesterone and estrogen secretion by the corpus luteum through the first trimester of p
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Answer:

Human chorionic gonadotropin

Explanation:

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Human chorionic gonadotropin is often used in pregnancy tests, since its presence indicates pregnancy.

6 0
4 years ago
Ferrets and hyenas have canine teeth that are well-developed and sharp. Which group describes these mammals?
Rus_ich [418]
<span>c.Carnivorous

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4 0
3 years ago
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For the same insolation, order these regions from "highest absorption to lowest."
son4ous [18]
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The Atlantic Ocean
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3 0
4 years ago
The lac operon in E.coli regulates genes that code for enzymes required for breakdown of lactose. The lac operon is____ operon t
user100 [1]

Ans.

Lac (lactose) operon in a type of bacterial operon, which shows a cluster of genes that are regulated by a single promoter. It is composed of an operator, promoter, a terminator, and three structural genes (lacA, lacY, and lacZ), which are responsible for the transport and breakdown of lactose.

The lac operon is an inducible operon as it gets activated in the presence of lactose and expressed its functional genes in the form of proteins (or enzymes) for lactose metabolism.  

Thus, the correct answer to be fill in first blank is 'inducible' and in second blank is 'lactose.'

8 0
3 years ago
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How is it that cells of the body are able to differentiate?
DaniilM [7]
In order for a cell to differentiate into its specialized form and function, it need only manipulate those genes (and thus those proteins) that will be expressed, and not those that will remain silent. The primary mechanism by which genes are turned “on” or “off” is through transcription factors.
7 0
3 years ago
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