The component of the bacterial cell wall that is targeted by lysozyme is:
A. Lipopolysaccharide
B. Cellulose
C. Peptidoglycan
D. Chitin
Answer: Option C
Solution (By JKExamLibrary)
Lysozyme, an enzyme found in tears, saliva, and egg white, hydrolyzes the β-1,4-glycosidic bond between N-acetylmuramic acid and N-acetylglucosamine in peptidoglycan, weakening the bacterial cell wall and causing lysis. It is part of innate immunity. Penicillin inhibits peptidoglycan synthesis.
Explanation:
The nucleolus is a prominent, non-membrane-bound structure within the nucleus. It is the site of active ribosomal RNA (rRNA) synthesis and the assembly of ribosomal subunits. These subunits then exit the nucleus through nuclear pores to combine in the cytoplasm and form functional ribosomes for protein synthesis.
Explanation:
Glycolysis is a cytoplasmic pathway that converts glucose into two pyruvate molecules, producing a net of 2 ATP and 2 NADH. Krebs cycle and ETC are in mitochondria.
Consider the following statements about vitamins:
1. Vitamin C deficiency causes scurvy.
2. Vitamin D deficiency causes beriberi.
3. Vitamin A deficiency causes night blindness.
Which of the above is/are correct?
Explanation:
Scurvy is vitamin C deficiency; night blindness is vitamin A deficiency. Beriberi is due to vitamin B₁ deficiency, not D. So 1 and 3 are correct.
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