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mash [69]
2 years ago
4

Extracellular glucose inhibits transcription of the lac operon by _____. Select one: a. strengthening the binding of repressor t

o the operator b. inhibiting RNA polymerase from opening the strands of DNA to initiate transcription c. activating adenylyl cyclase d. reducing the levels of intracellular cAMP e. weakening the binding of repressor to the operato
Biology
2 answers:
Eduardwww [97]2 years ago
8 0

Answer:D. Reducing the levels of intracellular cAMP

Explanation:

Glucose inhibits transcription of the lac operon as a repressor of adenlylate cyclace synthesis while decreasing intracellular cyclic AMP concentration.

Alex Ar [27]2 years ago
4 0

Answer:

d. reducing the levels of intracellular cAMP

Explanation:

Lac Operon can be defined as an unit of DNA that is made up of genes that is involved in the coding of proteins which are responsible for the transportation and metabolism of lactose in a cellular system before converting it to glucose.

When the levels of intracellular Cyclic Adenosine Monophosphate (cAMP) which helps to maintain sugar metabolism in the body are minimized extracellular glucose would inhibits transcription of the lac operon.

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n Drosophila melanogaster, forked bristles are caused by an allele (Xf) that is X linked and recessive to an allele for normal b
makkiz [27]

Answer:

Proportion of the F2 male with red eyes and forked bristle will be 1/4

Explanation:

forked bristles are caused by an allele (Xf) that is X linked and recessive to an allele for normal bristles (X+).

Brown eyes are caused by an allele (b) that is autosomal and recessive to an allele for red eyes (b+)

A female fly that is homozygous for normal bristles and red eyes mates with a male fly that has forked bristles and brown eyes

    X+X+b+b+  x    Xfbb

the F1 gives   1/2X+Xf 1/2b+b

                      1/2X+Y  1/2b+b

intercross of F1

      Proportion of the F2 male with red eyes and forked bristle will be

      forked bristle= Xfy = 1/2 and for red eyes  2/4= 1/2  = 1/2x1/2 =1/4

6 0
2 years ago
Which cell function would be affected if a cell's vacuoles were destroyed?
Masteriza [31]
<span>vacuoles are those cell which help in storage of water and minerals. plant have one vacuoles in plant cell but animal have abundant of small vacuoles cell. If there are no vacuoles there would be no reserves of food minerals, water, minerals etc in cells.</span>
8 0
2 years ago
Select the adaptations that occur in C4 plants but not C3 plants. a. Light and carbon reactions occur in separate cells. b. ATP
andrew11 [14]

Answer:

a. Light and carbon reactions occur in separate cells.  

b. ATP is used to move a three-carbon ferry molecule from bundle-sheath cells back to mesophyll cells.  

c. They require less water to live.  

g. These plants function better in the hot, sunny environments.

Explanation:

The plants which carry out C₄ pathway or Hatch and Slack pathway are called C₄ plants. Examples are maize, sugar cane, sorghum. They live in hot, dry or arid habitats. C₄ plants have dimorphic chloroplast. The chloroplast is in bundle sheath cells does not have grana and in the spongy mesophyll cells have chloroplasts with grana. So, light and carbon reactions occur in separate cells. C4 plants are more efficient in photosynthesis than the C₃ plants. There is no photorespiration in C₄ plants as Phospshoenol pyruvate (PEP) carboxylase enzyme.

8 0
2 years ago
The major muscle group of the lower extremities are
kenny6666 [7]

Answer:

<em>Reversed polarity</em> is when the hot and neutral connections at a receptacle are wired backwards/inverse—Home wiring is color-coded, and the black wire is “hot,” meaning that it is electrically charged or, as it is sometimes called, the “live” wire!

6 0
2 years ago
Which character trait is BEST established in the following excerpt? "In another moment down went Alice after it, never once cons
pshichka [43]

Answer:

C. Impulsive

Explanation:

The question is related to "Alice's Adventures in Wonderland." This is a novel written by <em>Lewis Carroll</em>, an English writer of fiction stories for children. It talks about Alice's adventures upon falling down a rabbit hole.

The excerpt, <em>"In another moment down went Alice after it, never once considering how in the world she was to get out again," </em>shows her character of being "impulsive." With this trait, Alice didn't think twice before going down the hole and following the rabbit. She never thought about the consequences of her decision. This is also shown when she kept on following the rabbit instead of going back home.

So, this explains the answer.

7 0
2 years ago
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