Antigen-presenting cells present antigens to
A) B lymphocytes.
B) T lymphocytes.
C) dendritic cells.
D) neutrophils.
Answer: B
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A squirrel visits your bird feeder every day, and has discovered that if it jumps onto the feeder, seeds will fall on the ground that it can eat. This learned behavior is known as
A. operant conditioning. B. classical conditioning. C. habituation. D. observational learning. E. imprinting.
Identify and describe:A
three different ways in which leaves can be arranged on stems, and list one example for each. B. three different venation patterns in leaves and whether each is characteristic of eudicots or monocots What will be an ideal response?
Ethylene
A) stimulates seed germination. B) causes phototropism. C) promotes leaf and fruit drop. D) prevents leaf senescence. E) promotes gravitropism.
A virus's ability to infect an animal cell depends primarily upon the
A) host cell's ability to phagocytize viral particles. B) presence of receptor sites on the cell membrane. C) type of viral nucleic acid. D) enzymatic activity of a host cell. E) presence of pili on the host cell wall.