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ziro4ka [17]
4 years ago
9

miRNAs can control gene expression by what action?A. degrading proteins as soon as they are formedB. inhibiting the catalytic ac

tivity of rRNAC. binding to mRNAs and degrading them or blocking their translationD. binding to DNA and preventing transcription of certain genesE. seeking out viral DNA and destroying it
Biology
1 answer:
levacccp [35]4 years ago
5 0

Answer:

C) binding to mRNAs and degrading them or blocking their translation

Explanation:

<u>miRNAs:</u>

miRNAs is the abbreviation of MicroRNAs. These are the small noncoding RNAs of ∼22 nucleotides which can not code for peptides. miRNAs are responsible for gene expression regulation at the level of post transcription. They can do so by forming complementary base pairing with target mRNA and inhibiting their translation.

They silenced mRNA by the following processes:

(1) Cleavage of the mRNA strand into pieces,

(2) stopping mRNA from translation into proteins by ribosomes.

(3) Shortening of mRNA poly(A) tail and destabilizing it.

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Pretend that you are writing a letter to the president proposing ways that the US can reduce its contribution to climate change.
ahrayia [7]

Answer:

Dear Mr. President,

Your strong voice has called attention to the risks of human-induced climate change and the need to take timely and effective steps to address it. We are pleased to report further progress in our efforts to advise you on climate policy options that could help encourage these steps.

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Sincerely,

Explanation:

hope this helps!

4 0
3 years ago
if 10 calories of energy are added to 2 grams of ice at negative 30 C calculate the final temperature of the ice
elena55 [62]
Hello.

M*Cp*(T’-Tf)=MCp(T'-T)

M*= Mass of Water. ; M= Mass of ice.

Cp*= Specific heat of water

Cp= Specific heat of ice

T= Temp. Of Ice

T'= Temp. of water

Tf= Equilibrium Temp.


Have  a nice day

8 0
3 years ago
What are the two main phases of the cell cycle? A. Prophase and anaphase B. Interphase and mitosis C. Replication phase and reco
Mila [183]

Answer:

Letter B.... :)

3 0
3 years ago
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When NADH is the electron donor to the respiratory chain, 2.5 ATP are formed, but when FADH2 is the electron donor, only 1.5 ATP
Fofino [41]

Answer:NADH donates it electron to complex I a higher energy level than other complexes while FADH donates it electron to complex II a lower energy complex.

Explanation:

Both NADH and FADH are shuttle of high energy electrons originally extracted from food into the inner mitochondrial membrane.

NADH donate it electron to a flavoprotein consisting of FMN prosthetic group and an iron-sulphur protein in ETC complex-I. Two electrons and one hydrogen ion are are transferred from NADH to the flavin prosthetic group of the enzyme.

While the electrons from FADH2 enters the ETC (electron transport chain) at the level of co-enzyme Q (complex II). This step does not librate enough energy to act as a proton pump.

So NADH produces 2.5 ATP during the ETC and oxidative phosphorylation because it donates its electron to Complex I, which pump more electrons across the membrane than other complexes.

5 0
3 years ago
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If a student tests a carrot with iodine and that test is negative what can that student conclude about the carrot?
Alex17521 [72]
That there is no starch present in the Carrot.
8 0
3 years ago
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