A mutation in the human gene for a fibroblast growth factor receptor (FGFR) appears to be responsible for ____
a. Duchenne muscular dystrophy
b. phenylketonuria
c. achondroplasia
d. sickle-cell anemia
e. cystic fibrosis
Answer: c. achondroplasia
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Angiosperms have a much higher water-transport capacity than that found in tracheid-only plants because:
A. the thinness of tracheids in angiosperms enhances their transport capability. B. the thin leaves of angiosperms allow them to transpire at a greater rate, moving more water. C. the specialization of cells into vessel elements and fibers allows transport and support to become separate functions. D. xylem in angiosperms is composed of living cells. E. the thin diameter of angiosperm vessels increases the rate of water flow.
When applying the Hardy-Weinberg law to a gene with dominant and recessive alleles, calculation of the allele frequencies always begins by writing the frequency of the _____________________ phenotype, then taking the _____________________ of this to obtain the frequency of the recessive allele
Fill in the blank(s) with correct word
Using genetic engineering techniques, you remove the sequences that code for the ribosome-binding sequences of the bacterial LacZ gene. The removal of these sequences will lead to ___________
(a) more LacZ protein produced due to faster ribosome movement across the LacZ mRNA. (b) transcriptional repression, resulting in fewer mRNA molecules produced from this gene. (c) a longer half-life for the LacZ mRNA. (d) translational inhibition of the LacZ mRNA.
During the passage of a nerve impulse,
a. sodium ions pass through gated channels. b. positive feedback causes more sodium ions to enter the cell. c. the interior of the cell becomes positive relative to the outside. d. changing voltage increases the number of open gates. e. all of these occur.