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Ahat [919]
3 years ago
9

What membranes lines the cavities and tubes in the digestive and respiratory system

Biology
1 answer:
Gwar [14]3 years ago
7 0
Firstly they are not membranes and they are villi's which increase the surface area during digestion
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A horse has 64 chromosomes and a donkey has 62. Using your knowledge of meiosis, explain why a cross between a horse and a donke
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Ok, so when a horse (with 64 chromosomes) is crossed with a donkey(that has 62 chromosomes), each parent give its child half of its chromosomes. [64/2=32] [62/2=31]. So the mule gets 31 pairs of chromosomes plus 32 pairs of chromosomes. That equals 63 total chromosomes. In order to be a parent, it must give <span>half of its chromosomes to its child. [63/2=31.5] You can't have half a chromosome, so the mule is a sterile organism. Let me know if you have questions.</span>
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3 years ago
During what phase of meiosis do sister chromatids separate ?
vladimir2022 [97]
I believe anaphase II.
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Answer:

c.

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In negative control of transcription by the lac operon, how does the presence of an inducer affect transcription?.
ss7ja [257]

If the inducer [allolactose] is present in the negative control then it will bind to the repressor decreasing its ability to bind to the operator due to which the transcription begins again and the operon is turned on.

Lac Operon is a set of three genes z, y & a which are regulated under the same promoter which regulates the amount of lactose production in the cell.

An inducer is a molecule that has the ability to induce or activate the operon. ex- in the case of the lac operon, allolactose acts as an inducer.

A repressor is a molecule that will repress or restricts the transcription of the genes of the operon, as a result, the operon will be switched off.

When the lac operon is under negative control, with no CAP [catabolite repressor protein] binding activity, the repressor remains active and thus binds to the operator region of the operon, as a result, no transcription takes place and the operon will be switched off.

But if the inducer will be present even in the negative control then the transcription takes place and the operon will be on.

Learn more about lac operon here

brainly.com/question/19596166

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4 0
1 year ago
How is the structure of a unicellular organism different than the structure of a multicellular organism? How does this affect fu
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Multicellular organisms can be much larger and more complex. This is because the cells of the organism have specialised into many different types of cells such as nerve cells, blood cells, muscle cells all performing different functions

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