What is the role of nitrogen-fixing bacteria?
What will be an ideal response?
Ans: Nitrogen-fixing bacteria capture nitrogen gas from the air and using hydrogen produce ammonium, which can be used as a nitrogen source by plants.
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The conversion of pyruvate to acetyl CoA is irreversible. Predict what would happen to fatty acids as a result of this
A. Fatty acids cannot be converted into carbohydrates.
B. Fatty acids cannot be metabolized in the citric acid cycle.
C. Fatty acids can be metabolized in glycolysis.
D. Fatty acids can be converted into carbohydrates.
The process of fermentation allows cells to
a. produce lactic acid as a byproduct in plants b. produce ethanol as a byproduct in animals c. regenerate NADH d. produce ATP when oxygen levels are low
Each DNA double helix has a backbone that consists of alternating ____.
A. covalent and ionic bonds B. nitrogen-containing bases C. hydrogen bonds D. sugar and phosphate molecules E. covalent and hydrogen bonds
Which of the following is an INCORRECT pairing?
A) protozoa; multicellular B) fungi; cell walls C) algae; aquatic and marine habitats D) prokaryotes; no nuclei E) viruses; acellular parasites