Consider statements about genetics: 1. DNA is transcribed into mRNA. 2. mRNA is translated into protein. 3. tRNA carries amino acids to the ribosome. Which are correct? MCQ with Answer and Explanation

Question

Consider statements about genetics: 1. DNA is transcribed into mRNA. 2. mRNA is translated into protein. 3. tRNA carries amino acids to the ribosome. Which are correct?

A. 2 and 3 only

B. 1 and 3 only

C. 1 and 2 only

D. 1, 2 and 3

Answer: Option D

Solution (By JKSSB Mock Tests)

Transcription is the process where the genetic information in a DNA sequence is copied into a complementary messenger RNA (mRNA) molecule by RNA polymerase. Translation is the process where the mRNA sequence is decoded by ribosomes to synthesize a specific polypeptide (protein). Transfer RNA (tRNA) molecules act as adapters, carrying specific amino acids to the ribosome based on the mRNA codon. All statements are correct.

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Correct Answer: Option A

Explanation:
Epithelial tissue forms sheets covering external surfaces (skin) and lining internal organs and cavities. It functions in protection, absorption, secretion, and sensation. Connective tissue supports and binds, muscle contracts, nervous transmits impulses. Epithelial cells are tightly packed with little extracellular matrix.

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Which of the following statements about the human immune system is correct?

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C. Innate immunity is specific to particular pathogens.

D. Passive immunity involves the production of memory cells.

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Correct Answer: Option A

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The vitamin whose active form, retinol, is essential for vision is:

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Correct Answer: Option A

Explanation:
Vitamin A (retinol) is converted to retinal, which combines with opsin to form rhodopsin, the light-sensitive pigment in rod cells of the retina. Deficiency leads to night blindness and xerophthalmia. Carrots and liver are rich sources. Vitamin C is ascorbic acid, D is calciferol, E is tocopherol.

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