Substances that are naturally produced by a certain microorganism are called

A. Antibiotics
B. Narrow-spectrum drugs
C. Semisynthetic drugs
D. Synthetic drugs
E. Broad-spectrum drugs


Answer: A. Antibiotics

Biology & Microbiology

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The pathway of metabolism that involves a series of electron transfers from reduced carrier molecules such as NADH2 and NADPH2 to a terminal electron acceptor is:

a. substrate-level phosphorylation. b. fermentative metabolism. c. oxidative phosphorylation. d. aerobic respiration.

Biology & Microbiology

What agricultural practice encourages the rapid

spread of plant diseases?

a. irrigation practices b. use of herbicide sprays c. genetic modification of crops d. planting large areas with a single variety e. use of pesticides

Biology & Microbiology

Why are population projection matrices so complicated?

A) because plant sizes are fixed over time B) because larger populations require more sophistication C) because fecundity is high in some species D) because some species can move back and forth between life stages

Biology & Microbiology

The global phosphorus cycle is called a "cycle," yet it has no atmospheric component. Phosphorus weathers from rocks and enters the soil. Once phosphorus is incorporated into plants or animals, how is it returned to the rock phase?

What will be an ideal response?

Biology & Microbiology