Mosses have ____.

A. xylem
B. lignin
C. true stems
D. rhizoids
E. independent sporophytes


Answer: D

Biology & Microbiology

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Blood and lymph have the following in common EXCEPT

A) nucleated cells. B) proteins. C) red blood cells. D) none of these

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The sweetener aspartame is a known excitotoxin. With regard to nerve cells, ingestion of this substance results in chronic nerve stimulation. With your knowledge of action potentials, this toxin must

A) stimulate continual impulses at the cell body. B) stimulate continual impulses at the dendrite. C) bind the nodes of Ranvier. D) block the synaptic cleft. E) stimulate continual impulses at the presynaptic receptors.

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Which of the following characteristics is often associated with animals that are radially symmetrical?

A) Gastrovascular cavity B) Sessile or otherwise nonmobile C) Cephalization D) Mobility E) Mesoderm

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Which of the following structures houses the corpus luteum?

a) ovary b) uterus c) vagina d) fallopian tube e) follicle

Biology & Microbiology