The plant cell wall is primarily composed of which of the following?
A. Chitin and Peptidoglycan
B. Cellulose, Hemicellulose, and Pectin
C. Silica and Calcium
D. Proteins and Lipids
Answer: Option B
Solution (By JKExamLibrary)
The plant cell wall is primarily made up of cellulose, hemicellulose, pectins, and proteins. Cellulose provides the main structural framework, while hemicellulose and pectins help in cross-linking and providing flexibility. Chitin is found in fungal cell walls, and peptidoglycan is found in bacterial cell walls.
Explanation:
Hexokinase phosphorylates glucose to glucose-6-phosphate using ATP, the first step of glycolysis. Phosphofructokinase is the third step, pyruvate kinase the last, glucose-6-phosphatase reverses the reaction in gluconeogenesis.
Explanation:
Daniel Koshland proposed the induced fit model (1958), where enzyme active site changes shape upon substrate binding. Fischer had proposed lock-and-key.
Explanation:
The bacterial cell wall is a rigid structure that provides shape and protection. It is primarily composed of peptidoglycan (also known as murein), a polymer consisting of sugars and amino acids. Gram-positive bacteria have a thick peptidoglycan layer, while Gram-negative bacteria have a thinner peptidoglycan layer and an outer membrane. Cellulose is in plant walls, and chitin is in fungal walls.
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