Which of the following is a correct statement about prokaryotic DNA? MCQ with Answer and Explanation

Question
Which of the following is a correct statement about prokaryotic DNA?
A. It is enclosed within a nuclear membrane.
B. It is circular and located in the nucleoid region.
C. It consists of multiple linear chromosomes.
D. It is linear and associated with histones.
Answer: Option B
Solution (By JKSSB Mock Tests)
Prokaryotic DNA is typically circular, double-stranded, and found in a nucleoid region without a nuclear membrane. It is not associated with histones (though some Archaea have histone-like proteins). Plasmids are extra-chromosomal DNA. Eukaryotic DNA is linear and complexed with histones. This difference is fundamental in cell classification.
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Question #1
Glucose is primarily reabsorbed in which part of the nephron?
A. Collecting duct
B. Distal convoluted tubule
C. Proximal convoluted tubule
D. Loop of Henle
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Correct Answer: Option C

Explanation:
The proximal convoluted tubule reabsorbs nearly 100% of filtered glucose, amino acids, and vitamins via active and secondary active transport.
This question belongs to: Science Biology
Question #2
Which of the following statements about the plant stem is correct?
A. It grows downward into the soil.
B. It bears leaves, flowers, and fruits.
C. It is the main site of photosynthesis in most plants.
D. It is usually positively phototropic.
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Correct Answer: Option B

Explanation:
Stem bears leaves and reproductive structures. It is positively phototropic (grows towards light). Leaves are the main photosynthetic organs. Roots grow downward.
This question belongs to: Science Biology
Question #3
In the human brain, the 'limbic system' is primarily associated with:
A. Coordination of voluntary motor movements
B. Regulation of heart rate and breathing
C. Regulation of emotions, memory, and motivation
D. Processing of visual and auditory information
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Correct Answer: Option C

Explanation:
The limbic system is a complex set of structures in the medial temporal lobe, including the hippocampus, amygdala, and hypothalamus. It is often called the 'emotional brain' and is primarily responsible for processing emotions (fear, anger, pleasure), forming and retrieving memories, and regulating motivation and homeostatic drives (hunger, thirst). The medulla regulates heart rate, the cerebellum coordinates movement, and the occipital/temporal lobes process sensory information.
This question belongs to: Science Biology
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