The scientist who discovered that DNA is the genetic material in bacteriophages was: MCQ with Answer and Explanation

Question
The scientist who discovered that DNA is the genetic material in bacteriophages was:
A. Hershey and Chase
B. Watson and Crick
C. Meselson and Stahl
D. Avery, MacLeod, McCarty
Answer: Option A
Solution (By JKExamLibrary)
Hershey and Chase (1952) used radioactive isotopes (³²P and ³⁵S) to show that DNA, not protein, enters bacteria during T2 phage infection and is the genetic material. Avery et al. earlier showed transforming principle was DNA. Watson and Crick determined structure, Meselson-Stahl replication mode.
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Question #1
The hormone that stimulates the secretion of testosterone from Leydig cells is:
A. FSH
B. LH
C. Inhibin
D. GnRH
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Correct Answer: Option B

Explanation:
Luteinizing hormone (LH) binds to Leydig cells in the testes, stimulating testosterone production. FSH stimulates Sertoli cells for spermatogenesis. GnRH is hypothalamic.
This question belongs to: Science Biology
Question #2
The salivary gland located below the tongue is the:
A. Sublingual gland
B. Parotid gland
C. Submandibular gland
D. Lacrimal gland
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Correct Answer: Option A

Explanation:
The sublingual glands are the smallest of the three paired salivary glands, located under the tongue. The parotid is near the ear, submandibular under the jaw.
This question belongs to: Science Biology
Question #3
Consider statements about genetics: 1. DNA replication is semi-conservative. 2. Transcription occurs in the cytoplasm. 3. Translation occurs at ribosomes. Which are correct?
A. 2 and 3 only
B. 1 and 3 only
C. 1 and 2 only
D. 1, 2 and 3
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Correct Answer: Option B

Explanation:
DNA replication is semi-conservative, meaning each new DNA molecule contains one original parental strand and one newly synthesized strand. Transcription, the synthesis of mRNA from a DNA template, occurs in the nucleus of eukaryotes, not the cytoplasm. Translation, the synthesis of proteins from mRNA, occurs at ribosomes in the cytoplasm or on the rough ER. Thus, statements 1 and 3 are correct.
This question belongs to: Science Biology
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