Why have so few primates gone extinct compared to other groups, for example, mussels or birds?
a. they have large brains
b. they are not killed for food or other human uses
c. they live in stable environments
d. they are among the most closely monitored and protected species
e. they are highly mobile
D
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Ghost shrimp and mud shrimp play an active role in:
a. compacting the sediment. b. reducing species through competition. c. decomposition of seagrass roots. d. oxygenating the sediments. e. consuming marsh plants.
Pneumocystis jiroveci infects only immunocompromised patients.
Answer the following statement(s) true (T) or false (F)
The interleukin-2 (IL-2) growth factor interacts with receptors on
A) embryonic cells. B) cytotoxic T lymphocytes. C) mesenchymal cells. D) smooth muscle cells. E) epithelial cells.
What part of the DNA replication process would be most directly affected if a strain of bacteria lacking primase were used to make the cell extracts?
(a) initiation of DNA synthesis (b) Okazaki fragment synthesis (c) leading-strand elongation (d) lagging-strand completion