leu refers to a gene that governs a cell’s ability to synthesize leucine from inorganic precursors. The
designation leu- indicates:
a. that the allele is normal.
b. that the allele is the mutant allele.
c. that the bacterium is biologically active.
d. that the bacterium is biologically inactive.
e. that the bacterium can make its own leucine.
B
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In obesity studies in mice, the binding of leptin activates the leptin receptor and initiates changes in ____ in the hypothalamus
a. nucleotide sequences b. cell membranes c. mitochondria d. fat storage e. gene expression
The onset of puberty is triggered by maturation of the brain, which stimulates the hypothalamus to secrete
A) testosterone. B) progesterone. C) gonadotropin-releasing hormone (GnRH). D) luteinizing hormone (LH). E) chorionic gonadotropin (CG).
A researcher hypothesizes that crocodile gender is determined by the incubation temperature of the egg. The hypothesis states that an average nest temperature of 32-33°C results in the birth of male crocodiles while cooler and higher incubation temperatures result in female crocodiles.What is the most likely explanation for how a group of crocodiles acquired the trait in which lower incubation temperatures give rise to male crocodiles?
A. Horizontal gene transfer from a related species has introduced changes in this group's proteome. B. One or more mutations in the proteome have been passed through the group by vertical descent. C. One or more mutations in the genome have been passed through the group by vertical descent. D. Horizontal gene transfer from a related species has introduced changes in this group's genome.
Which species is best associated with an occipital bun?
A. Humans B. Neandertals C. Homo erectus D. Homo habilis E. Australopithecines