In studying osteoporosis in humans, you wish to test a newly designed treatment for efficacy. Your best choice for a model organism would be
A) Escherichia coli.
B) Mus musculus.
C) Caenorhabditis elegans.
D) Arabidopsis thaliana.
E) Pisum sativum.
Answer: B
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The major group of organisms that fix nitrogen into ammonia and then oxidize it to nitrate are ________.
A. protozoa B. bacteria C. fungi D. algae
Biofilms ____
a. are formed by prokaryotes living in a watery environment b. may develop on surgical implants c. are exemplified by dental plaque
d. are formed by prokaryotes living in a watery environment and may develop on surgical implants e. are formed by prokaryotes living in a watery environment, may develop on surgical implants, and are exemplified by dental plaque
Which of the following would decrease central venous pressure?
A) increased respiratory activity B) standing up C) activity of skeletal muscles D) increased blood volume E) increased sympathetic activi
The nematode Caenorhabditis elegans _____
A) is composed of about 1000 cells, in which the developmental origin of each cell has been mapped B) has only a single chromosome, which has been fully sequenced C) has about 1000 genes, each of which has been fully sequenced D) uniquely, among animals, utilizes programmed cell death during normal development