The molecule that acts as the universal energy carrier in cells is:
A. Glucose
B. Acetyl CoA
C. ATP
D. NADPH
Answer: Option C
Solution (By JKExamLibrary)
ATP (adenosine triphosphate) is the immediate energy currency for cellular processes. Hydrolysis of its high-energy phosphate bonds releases energy. Glucose and acetyl CoA are fuels, NADPH is an electron donor for biosynthesis. ATP is generated by substrate-level phosphorylation and oxidative phosphorylation.
Explanation:
Vitamin B₆ exists in three forms: pyridoxine, pyridoxal, and pyridoxamine. Its active form, pyridoxal phosphate (PLP), is a coenzyme in amino acid metabolism and neurotransmitter synthesis. Deficiency can cause peripheral neuropathy and anemia.
Explanation:
Whittaker's five-kingdom system places all prokaryotes (bacteria, cyanobacteria, archaea) in Monera. They lack a true nucleus and membrane-bound organelles. Protista has unicellular eukaryotes, Fungi and Plantae are multicellular eukaryotes (except yeast). Monera reproduces asexually mainly by binary fission.
Explanation:
The tracheal wall contains C-shaped hyaline cartilage rings that keep the airway open, preventing collapse due to negative pressure during inspiration. Smooth muscle and fibrous tissue connect the rings, ciliated epithelium sweeps mucus upward.
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