Which of the following is/are TRUE regarding serotonin?
a. serotonin is synthesized from tryptophan
b. serotonin is a peptide
c. serotonin regulates anxiety and aggression
d. serotonin is a neurotransmitter
e. a, c, and d
Answer: e. a, c, and d
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Examine the phylogenetic tree depicted in Figure 26.17 as you address the following questions. Extremophiles live in environments with high temperature, low pH, or high salt conditions;
however, hyperthermophiles, acidophiles, and halophiles can also thrive in less extreme environments. A. true B. false
To study the genome of the loblolly pine, Pinus taeda, researchers obtained DNA from ____ cells, thereby halving the
amount of DNA for initial sequencing.
a. haploid b. diploid
c. triploid d. polyploid e. hexaploid
Which section of the pre-mRNA contains the protein-coding regions?
A. introns B. exons C. The entire pre-mRNA contains protein-coding regions. D. The pre-mRNA does not code for proteins at all.
Which of the following is endemic in wild rodent populations of the western United States?
A. pneumonia B. diphtheria C. tuberculosis D. anthrax E. plague