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lesantik [10]
3 years ago
12

QUICK help me!

Biology
2 answers:
viktelen [127]3 years ago
8 0

Answer:

Its the first one scientists investigate a new way to clean spilled oil on land.

icang [17]3 years ago
5 0

Answer:

the first one

Explanation:

hope this helped :))

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Inner membrane of mitochondrion
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The physician did a visual examination of the vagina and cervix to note changes in the cells and capillary network. the procedur
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Henry wanted to know how fast his pet tortoise could walk.
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3 years ago
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
What organelle must temporarily break apart so that the dna can divide up?
natita [175]
The organelle that temporarily breaks apart so that the DNA can divide up is the nucleus. Nucleus store most of the cell's DNA it is responsible for carrying genetic information. It is also responsible for generating genetic expression to ensure the proper activities of the entire cells. 
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3 years ago
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