Which of the following is true about soil horizons?
a. They vary in number but are all of equal depth.
b. There are always four of them, but they vary in depth.
c. They vary in number and depth.
d. There are always four of equal depth.
c. They vary in number and depth.
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Clumping factor, coagulase, and protein A serve to coat Staphylococcus with host proteins
Indicate whether this statement is TRUE or FALSE.
Among Madagascar hissing cockroaches, males have horns that they use to fight with one
another for access to mates. Typically, the largest male with the biggest horns wins most of the fights and tends to mate with most of the females. This is an example of __________.
a. dominance hierarchy b. intraspecific competition c. niche partitioning d. all of these e. both dominance hierarchy and intraspecific competition
A peptidoglycan-hydrolyzing protein isolated from bacteriophage P68 has been used in synergy with the antimicrobial agent gentamicin, enhancing the antimicrobial effects of the drug toward Staphylococcus aureus. This is an example of microbial control by ________.
A. antisepsis B. predation C. enzybiotics D. sterilization E. heavy metals
Viruses completely lack the genes for synthesis of
A) metabolic enzymes. B) proteins in the capsid. C) lipids in the envelope. D) nucleic acids in the core.