When some birds mature, they migrate long distances to their breeding grounds or to escape harsh weather. A signal
for this type of behavior is often:a.
a conditioned stimulus.
b. day length.
c. negative reinforcement.
d. a sign stimulus.
e. territoriality.
b
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What are plasmids?
A. Small, circular RNA molecules that contain many genes but that cannot be passed on to other bacteria B. Small, circular DNA molecules that contain just a few genes and that can be passed on to other bacteria C. Small, circular RNA molecules that contain just a few genes and that can be passed on to other bacteria D. Small, circular DNA molecules that contain just a few genes but that cannot be passed on to other bacteria
Which cells mature in the thymus gland?
a. T cells b. mast cells c. macrophages d. neutrophils e. eosinophils
When does crossing-over occur?
A) Prophase I of meiosis B) Prophase II of meiosis C) Interphase prior to meiosis D) At any time during the second meiotic division E) At any time throughout division
Which of the following parts of an amino acid vary among different amino acids?
A. the carboxyl group B. the side chain, or R group C. the amino group D. the hydrogen on the central carbon