Consider statements about microorganisms: 1. Bacteria are prokaryotic. 2. Fungi have chlorophyll. 3. Viruses can reproduce without a host. Which are correct? MCQ with Answer and Explanation

Question
Consider statements about microorganisms: 1. Bacteria are prokaryotic. 2. Fungi have chlorophyll. 3. Viruses can reproduce without a host. Which are correct?
A. 2 and 3 only
B. 1, 2 and 3
C. 1 and 3 only
D. 1 only
Answer: Option D
Solution (By JKExamLibrary)
Bacteria are unicellular prokaryotes lacking a true nucleus and membrane-bound organelles. Fungi are heterotrophic eukaryotes that lack chlorophyll and cannot perform photosynthesis. Viruses are obligate intracellular parasites that lack metabolic machinery and absolutely require a living host cell to replicate. Therefore, only statement 1 is correct.
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Question #1
The hormone that increases blood calcium levels is:
A. Thyroxine
B. Parathyroid hormone
C. Calcitonin
D. Insulin
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Correct Answer: Option B

Explanation:
Parathyroid hormone (PTH) raises blood calcium by increasing bone resorption, kidney reabsorption, and activating vitamin D. Calcitonin lowers calcium. Thyroxine regulates metabolism, insulin glucose.
This question belongs to: Science Biology
Question #2
The type of tissue that supports and binds other tissues is:
A. Connective tissue
B. Epithelial tissue
C. Nervous tissue
D. Muscle tissue
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Correct Answer: Option A

Explanation:
Connective tissues (bone, cartilage, blood, adipose) provide structural framework, support, and bind organs. Epithelial covers surfaces, muscle enables movement, nervous conducts impulses.
This question belongs to: Science Biology
Question #3
The blood group known as the universal donor is:
A. A positive
B. B negative
C. AB positive
D. O negative
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Correct Answer: Option D

Explanation:
O negative blood lacks A, B, and Rh antigens, so it can be transfused to any recipient without causing agglutination, making it the universal donor.
This question belongs to: Science Biology
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