The genetic material in most bacteria is: MCQ with Answer and Explanation

The genetic material in most bacteria is:
A. Single-stranded RNA
B. Double-stranded RNA
C. Linear DNA
D. Circular DNA
Answer: Option D
Solution (By JKExamLibrary)
Bacteria typically have a single circular double-stranded DNA chromosome located in the nucleoid. They may also have plasmids.

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Practice More Biology Questions

Question #1
The organelle that contains enzymes for the Krebs cycle is:
A. Chloroplast
B. Golgi body
C. Nucleus
D. Mitochondrion

Correct Answer: Option D


Explanation:
The matrix of mitochondria contains all enzymes of the Krebs cycle (except succinate dehydrogenase which is in the inner membrane). The nucleus contains DNA, chloroplasts contain Calvin cycle enzymes, Golgi modifies proteins.

This question belongs to: Science Biology
Question #2
In the human digestive system, the 'Peyer's patches' are aggregated lymphoid nodules found primarily in the mucosa and submucosa of the:
A. Stomach
B. Esophagus
C. Large intestine
D. Ileum (small intestine)

Correct Answer: Option D


Explanation:
Peyer's patches are organized lymphoid follicles (aggregated lymphoid nodules) located in the mucosa and submucosa of the small intestine, most abundantly in the ileum (the distal part). They are a crucial component of the gut-associated lymphoid tissue (GALT) and play a vital role in monitoring intestinal bacteria populations, preventing the growth of pathogenic bacteria, and training the immune system to recognize antigens.

This question belongs to: Science Biology
Question #3
Consider the following statements about the human heart:
1. The pericardium is a protective sac around the heart.
2. The endocardium lines the heart chambers.
3. The myocardium is the outermost layer.
Which of the above is/are correct?
A. 1, 2, and 3
B. 1 and 3 only
C. 1 and 2 only
D. 2 and 3 only

Correct Answer: Option C


Explanation:
Pericardium is outer sac, endocardium inner lining. Myocardium is the middle muscular layer; the outermost is epicardium (visceral pericardium). So 3 is incorrect.

This question belongs to: Science Biology