Which of the following statements is true about vitamins?
A. Vitamins are organic nutrients that break down to form energy for the cell.
B. Vitamins are enzymes that catalyze chemical reactions in cells.
C. Vitamins are molecules that assist enzymes in chemical reactions or assist in energy-related pathways.
D. Vitamins are nutrients that are directly metabolized through cellular respiration pathways, providing energy for the cell.
E. Vitamins are molecules that lower the activation energy of chemical reactions, allowing them to proceed rapidly.
Answer: C
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A biologist draws a tree of life having only three branches. Which of the following groups did the biologist most likely choose for her diagram?
A. fungi, eukarya, and vertebrates B. archaea, bacteria, and eukarya C. vertebrates, bacteria, and archaea D. bacteria, fungi, and archaea E. eukarya, bacteria, and fungi
mRNA regulation can be achieved at the level of
A) transport. B) processing. C) translation. D) life span (degradation). E) All of these
If a toxin, such as a bacterial toxin, destroys ribosomes, what cellular activity will be affected first?
a. protein synthesis b. DNA synthesis c. movement d. energy storage e. active transport
Enzyme 1 converts substrate A into product B. Is this an example of a metabolic pathway?
A. Yes. This is a simple metabolic pathway. B. Yes. This is a metabolic pathway that includes feedback inhibition. C. No. This only describes one chemical reaction. A metabolic pathway includes multiple chemical reactions. D. No. A metabolic pathway must include an inhibitory step.