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3 years ago

Identify 3 roles of proteins

2 answers:

8 0

Proteins is a main source of energy that transports nutrients through your body, provides structure, and acts as a messenger via the circulatory system.

Lina20 [59]3 years ago

5 0

Answer:

Act as enzymes, receptors, transport molecules, regulatory proteins

Explanation:

major roles of proteins:

1. Protein as enzymes:

Amino acids together make proteins, proteins together produce enzymes. Enzymes are basic element which has important role in speeding up a chemical reaction. Example: amylase

2. Receptors:

The binding of ligand and receptors are carried out different proteins that are found in the cells. on binding of proteins, conformational change will occur which in turn activates various functions inside our body. Example: CO

3. Regulatory proteins:

Regulatory proteins plays a vital role in expression of genes. they are the proteins that are found in the intact regions of DNA for the control of genes. These proteins are transcribed by RNA polymerase to during transcription.

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After a search of nucleotide sequence databases, researchers identified an IRE in the 5c untranslated region of a gene encoding

grigory [225]

<h3><u> Full Question:</u> </h3>

After a search of nucleotide sequence databases, researchers identified an IRE in the 5' untranslated region of a gene encoding aconitase, an enzyme involved in the Krebs cycle. Which of the following pieces of experimental evidence best supports the claim that the synthesis of aconitase is controlled by a mechanism similar to ferritin regulation?

(A) IRP binds to aconitase mRNA in the presence of iron.

(B) The relative amount of aconitase protein increases in the presence of high levels of iron. NADH and FADH2, increase in the presence of high levels of iron.

(D) The levels of reduced electron carriers.

<h3><u>Answer: </u></h3>

The relative amount of aconitase protein increases in the presence of high levels of iron. NADH and FADH2, increase in the presence of high levels of iron which best support the claims.

Option B

<h3><u>Explanation: </u></h3>

Iron induced toxicity deals with the excess intracellular iron. The excess amount of iron are binded by Ferritin that is an intracellular iron storage. The cells are protected from the iron induced toxicity by the presence of ferritin.

When the iron levels are high, the intracellular iron binds to the IRP. The iron-IRP dislocates from IRE releasing ribosomes to proceed with the translation of ferritin mRNA. When iron levels are low, a repressor of translation, iron response protein (IRP), binds to an iron response element (IRE), which is a stem-loop structure near the 5' end of ferritin mRNA.

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4 years ago

What were the first plants that did not require water for reproduction?

MAVERICK [17]

Gymnosperms were the first seed plants. They do not make flowers or fruits, so their seeds are unprotected, hence the name gymnosperms which means "naked seed".

These seeds are wind-dispersed pollen that doesn't need water for fertilization.

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3 years ago

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Explanation:

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Softa [21]

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Explanation:

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A scientist wants to observe the structure that joins a cell to neighboring cells. How should the scientists observe the detaile

andriy [413]

They need to use a microscope

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4 years ago

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