All the following apply to B cells except
A) originate in the bone marrow.
B) reside in the lymphoid tissue.
C) mature in the bone marrow.
D) coordinate the humoral response by making antibodies.
E) play a critical role in both the cellular and humoral responses.
Answer: E
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The three phylogenetic trees above all contain the same members, all have a common ancestor, but are divided up in three different ways. Which tree has members circled that are of several evolutionary lines and does not include the most recent common ancestor of the included lineages? What is this type of group is this?
A. Tree 3; polyphyletic.
B. Tree 2; polyphyletic.
C. Tree 1; monophyletic.
D. Tree 3; monophyletic.
E. Tree 2; paraphyletic.
Chemical mutagens often act by altering the
A. alkyl groups of the nucleobase. B. nucleobase sequence. C. number of binding sites on the nucleobase. D. hydrogen bonding properties of the nucleobase.
Which of the following does NOT describe the autonomic nervous system?
A) Neurons release norepinephrine or acetylcholine onto their target organ. B) It is subdivided into sympathetic and parasympathetic divisions. C) It regulates heart rate. D) It controls voluntary movements. E) It forms synapses with smooth muscles in blood vessels.
Herbivores, carnivores, and omnivores are subclasses of which one of the four components of a typical ecosystem?
A) composers B) heterotrophs C) autotrophs D) abiotics