How many protein-encoding genes constitute the human genome?
A. 46
B. about 25,000
C. more than 1 million
D. 500,000
Answer: B
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Which of the following INCORRECTLY states a principle of the chromosome theory of inheritance?
A. Genes are transmitted from parent to offspring via chromosomes. B. Gametes contain either a maternal or paternal set of chromosomes. C. Somatic cells contain a maternal and paternal set of chromosomes. D. The paternal and maternal chromosomes assort randomly during meiosis. E. Gametes are haploid and somatic cells are diploid.
In contrast to the cephalic and absorptive phases, the fasting phase is characterized by high blood levels of ________ and low levels of _______.
(a) glucagon; insulin (b) pepsin; insulin (c) insulin; glucagon (d) insulin; pepsin
Which early scientist proposed that cells arise only from pre-existing cells?
a. Theodor Schwann b. Robert Brown c. Matthias Schleiden d. Rudolf Virchow
Which of the following statements regarding heterotrimeric G proteins in a resting state is true?
a. GDP is bound to the ? subunit in a complex with both the ? and ? subunits. b. GDP is bound to the ? subunit in a complex with both the ? and ? subunits. c. GTP is bound to the ? subunit in a complex with both the ? and ? subunits. d. The proteins are in a complex with G protein-coupled receptors.