Consider statements about human diseases: 1. Typhoid is caused by Salmonella typhi. 2. Malaria is caused by a virus. 3. Ringworm is a fungal infection. Which are correct? MCQ with Answer and Explanation

Question

Consider statements about human diseases: 1. Typhoid is caused by Salmonella typhi. 2. Malaria is caused by a virus. 3. Ringworm is a fungal infection. Which are correct?

A. 1 and 3 only

B. 1, 2 and 3

C. 1 and 2 only

D. 2 and 3 only

Answer: Option A

Solution (By JKExamLibrary)

Typhoid fever is a bacterial disease caused by Salmonella enterica serotype Typhi. Ringworm is a superficial fungal infection caused by dermatophytes like Microsporum and Trichophyton. Malaria is not caused by a virus; it is caused by a protozoan parasite of the genus Plasmodium. Therefore, statements 1 and 3 are correct, while 2 is false.

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Question #1

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Identify the correct statement about the cell nucleus:

A. It is surrounded by a single membrane.

B. It contains the nucleolus, which synthesizes ribosomal RNA.

C. DNA replication occurs in the cytoplasm.

D. It is absent in all eukaryotic cells.

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Correct Answer: Option B

Explanation:
The nucleolus makes rRNA and assembles ribosomal subunits. Nucleus has a double membrane, is present in eukaryotes, and is the site of DNA replication.

This question belongs to: Science Biology

Question #2

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The phenomenon where a single gene mutation affects multiple traits is:

A. Codominance

B. Pleiotropy

C. Polygenic inheritance

D. Epistasis

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Correct Answer: Option B

Explanation:
Pleiotropy is when one gene influences several distinct phenotypic characteristics. Example: sickle cell disease (mutant hemoglobin affects RBC shape, causing anemia, pain, organ damage). Polygenic traits involve many genes, codominance both alleles expressed, epistasis gene interaction.

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Question #3

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The most common method of reproduction in bacteria is:

A. Spore formation

B. Fragmentation

C. Budding

D. Binary fission

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Correct Answer: Option D

Explanation:
Binary fission is the primary and most common method of asexual reproduction in bacteria. In this process, the bacterial cell replicates its DNA and then divides into two identical daughter cells. Under optimal conditions, some bacteria can divide every 20 minutes. Bacteria can also exchange genetic material through processes like conjugation, transformation, and transduction.

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