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Marysya12 [62]
3 years ago
7

Which is not a major muscle in the human body?

Biology
1 answer:
umka21 [38]3 years ago
7 0
<span>Sternum is not a major muscle in the human body.  Sternum is t</span>he long flat bone in the upper middle of the front of the chest. It is also called a Breastbone.  Sternum <span>the </span>sternum<span> helps protect the internal thoracic viscera - such as the heart, lungs and oesophagus</span>
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Which statement about the cell membrane is true?
BartSMP [9]

Answer:

The answer is C

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​ A polysome is ____. a. ​ the complex that adds a poly(A) tail onto an mRNA b. ​ an mRNA transcript to which multiple ribosomes
WARRIOR [948]

Answer:b. ​ an mRNA transcript to which multiple ribosomes are attached

Explanation: polysome consist of mRNA complex and two or more ribosome coming together to translate mRNA into a polypetide or amino acid. It helps produce many polypeptide from a single mRNA.

Different ribosomes bind to the mRNA at different time elongating the polypeptide chain. We have the free( non-poly A ) and memberane bound (poly A) polysome.

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3 years ago
Which of the following mutations could lead to constitutive expression of the genes of the lac operon? View Available Hint(s) Wh
Molodets [167]

Options for part A are as follows:

A) A mutation in the operator sequence

B) A mutation in the lac-Z gene

C) A mutation in the lac-Y gene

D) A super repressor mutation

Answer:

The correct answer:

Part a - A mutation in the operator sequence

Part b - It ensures that a cell dedicates resources to the production of enzymes involved in lactose metabolism only when lactose is available in the environment

Part C. true.

Explanation:

part a:

If there is a mutation in the operator sequence leads to prevent binding of the repressor which leads to allowing constitutive expression of the genes various conditions.

part b:

The biological role of the lac operon makes sure that the cell dedicates resources to the production of enzymes involved in lactose metabolism only when lactose is available in the environment

Part c:

RNA polymerase cannot transcribe the structural genes due to the repressor binds to the lac operator, therefore, the proper function of the lac operon is possible when the placement of the operator sequence between the promotor and the structural genes.

4 0
3 years ago
Which of the following is UNLIKELY to affect bone remodeling?
S_A_V [24]

Glucagon

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Bone remodeling involves coordinations of osteoclasts and osteoblasts cells in the bone. The former breaks down bone tissue while the latter mineralizes bones. Calcium is the main ion in the body significant in mineralization of bone. Excess Ca2+ is stored in bone while low calcium levels in blood result in bone resorption.  

Stress on a bone also causes increased mineralization to strengthen the bone against this stress. This is why astronauts when they go to space, due to less stress from low gravity, bone loses its mass. When they return back to earth, the bone readjusts to the increased stress from higher gravity by increased mineralization.

The hormone responsible for bone homeostasis is parathyroid hormone.

Learn More:

To learn more about bones check out; brainly.com/question/4128260

#LearnWithBrainly

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