Respiratory proteins such as __________ in red blood cells and __________ in muscle bind oxygen and help maintain
gradients that favor gas exchange. Fill in the blank(s) with the appropriate word(s).
ANSWER: hemoglobin; myoglobin
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Metabolic pathways that build cellular molecules are
1.catabolic pathways. 2.exergonic pathways. 3.anabolic pathways. 4.at equilibrium. 5.biological pathways.
If the heterozygous genotype is favored (as exhibited by the sickle cell allele in malaria-prone regions), selection results in a ________ in which alleles reach stable equilibrium frequencies that are maintained by the ongoing action of selection
against the homozygous genotypes. Fill in the blank(s) with correct word
Which biome is characterized by large, grazing mammals?
A) chaparral B) temperate grassland C) desert D) temperate forest
Which of the following statements about the Ey transcriptional regulator is false?
(a) Expression of Ey in cells that normally form legs in the fly will lead to the formation of an eye in the middle of the legs. (b) The Ey transcription factor must bind to the promoter of every eye-specific gene in the fly. (c) Positive feedback loops ensure that Ey expression remains switched on in the developing eye. (d) A homolog of Ey is found in vertebrates; this homolog is also used during eye development.