For which of the following diseases would animal models likely yield the most information?
a. alcoholism
b. schizophrenia
c. bipolar disorder
d. Huntington disease
e. nicotine addition
d
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Plant hormones generally ____ concentrations to be effective, and usually have ____ on different plant
tissues.
a. are effective only in extremely large; the same effect b. require only low; different effects c. require only low; the same effect d. are effective only in extremely large; different effects e. require moderate; the same effect
What is an organism's advantage to having a single reproductive event in a lifetime rather than being able to reproduce repeatedly? a. Reach a higher level of reproductive maturity
b. Having to raise only one group of offspring. c. Being able to invest all its energy into the production of offspring. d. Being able to divide energy among growth, reproduction and maintenance.
Which of the following statements is
INCORRECT about eukaryotic chromosomes?
a. The number of chromosomes varies from one species to another. b. All eukaryotes have the same system of autosomes and sex chromosomes. c. A chromosome consists of DNA associated with histone proteins. d. After duplication, all paired chromosomes are attached at the centromere. e. After duplication, each chromosome consists of two sister chromatids.
A protein kinase can act as an integrating device in signaling if it ___________________
(a) phosphorylates more than one substrate. (b) catalyzes its own phosphorylation. (c) is activated by two or more proteins in different signaling pathways. (d) initiates a phosphorylation cascade involving two or more protein kinases.