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sergejj [24]
2 years ago
6

Pleasee help mee i need to answerr its due tonightt

Biology
1 answer:
boyakko [2]2 years ago
8 0
SAME AND V ARRYING you’re welcome!!!!!
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1. Suppose the synthesis of an amino acid was accomplished by four enzymes encoded by four genes that formed an operon. Draw a m
vivado [14]

I have attached lac operon model having 4 genes. See attachment for better understanding.

Answer:

The Lac operon is controlled  by two signals.

Initiation

Glucose and lactose  concentrations control the initiation of  transcription of the Lac operon through  their effects on the Lac repressor protein  and Cap.

Lactose absent (Repression)

When lactose is absent, the Lac  repressor binds the Lac operator and shuts  off expression of the operon.

Lactose present (Transcription)

Addition  of lactose increases the intracellular  concentration of a related compound,  allolactose. allolactose binds to the  Lac repressor, causing it to undergo a  conformational change that releases its grip  on the operator DNa.

Glucose absent (Repression)

When  glucose is absent, cyclic aMp (red triangle)  is produced by the cell and Cap binds to  DNA.

Glucose present (Transcription)

LacZ, the first gene of the operon,  encodes the enzyme b-galactosidase, which  breaks down lactose to galactose and  glucose.

7 0
3 years ago
Which model shows more diversity? <br><br> A. Food chain<br> B. Food web
Rudiy27

Answer: A food web.

Explanation:

A food web has more diversity because a food chain only shows what each animal eats. A food web,however, shows everything you need to know and more.

5 0
2 years ago
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Which matter exists in the liquid state at room temperature?
Ronch [10]

B) honey

A shirt is a solid, and helium is a gas at room temperature. A nebula is... not an object.

5 0
2 years ago
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Help me asap plz? :
aleksley [76]
Breathing rate is controlled by breathing in co2 into your lungs and breathing out co2 hope this helps
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What animals are biologically closest to humans?
Brilliant_brown [7]
Pigs I believe because we take organs from them to perform transplants
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