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

Biology & Microbiology

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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.

Biology & Microbiology

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

Biology & Microbiology

Which early scientist proposed that cells arise only from pre-existing cells?

a. Theodor Schwann b. Robert Brown c. Matthias Schleiden d. Rudolf Virchow

Biology & Microbiology

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.

Biology & Microbiology