The pigment that gives the blue color to cyanobacteria is: MCQ with Answer and Explanation

Question
The pigment that gives the blue color to cyanobacteria is:
A. Carotene
B. Phycoerythrin
C. Chlorophyll a
D. Phycocyanin
Answer: Option D
Solution (By JKExamLibrary)
Phycocyanin is a blue phycobiliprotein pigment present in cyanobacteria (blue-green algae), along with chlorophyll a. Phycoerythrin is red, carotene orange. Phycobilins are accessory pigments that capture light energy for photosynthesis.
This question belongs to: Science Biology
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Question #1
Riboflavin is also known as:
A. Vitamin B₂
B. Vitamin B₁₂
C. Vitamin B₆
D. Vitamin B₁
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Correct Answer: Option A

Explanation:
Vitamin B₂ is riboflavin, a component of coenzymes FAD and FMN involved in redox reactions. Deficiency causes angular stomatitis, cheilosis, and glossitis. It is water-soluble.
This question belongs to: Science Biology
Question #2
Consider statements about cell division: 1. Cytokinesis in plant cells occurs by cell plate formation. 2. Meiosis maintains the chromosome number. 3. Mitosis occurs in somatic cells. 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:
In plant cells, which have rigid cell walls, cytokinesis occurs by the formation of a new cell wall (cell plate) in the middle of the cell. Mitosis is equational division occurring in somatic cells for growth and repair, maintaining the same chromosome number. Meiosis is reductional division, halving the chromosome number to produce gametes. Thus, statements 1 and 3 are correct.
This question belongs to: Science Biology
Question #3
Which of the following statements about the cell cycle is correct?
A. Cytokinesis occurs before prophase.
B. The S phase is when DNA synthesis occurs.
C. DNA replication occurs during the G2 phase.
D. Mitosis is the longest phase of the cell cycle.
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Correct Answer: Option B

Explanation:
In the S (synthesis) phase of interphase, DNA is replicated. G2 is preparation for mitosis. Interphase is the longest. Cytokinesis follows telophase.
This question belongs to: Science Biology
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