Which pre-mRNA processing mechanism allows different proteins to be produced from the same DNA sequence?
a. transposition
b. alternative splicing
c. intron shuffling
d. intron splicing
e. open reading frame shuffling
ANSWER: b
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If a population of diploid organisms has three different alleles for a particular gene, how many different genotypes are possible?
A. 2 B. 3 C. 6 D. 9 E. 12
The formation of the bivalent during meiosis
A. is required for the pairing of homologous chromosomes. B. contributes to the genetic diversity of a species. C. ensures that the resulting haploid cells will have the same combination of homologous chromosomes as the original diploid cell. D. aids the alignment of sister chromatids in a single row along the metaphase plate. E. occurs during meiosis I and meiosis II.
Cellulose synthase in plants is located
a. in the Golgi apparatus. b. in the cytosol. c. in the plasma membrane. d. outside the cell.
In the nitric oxide signaling pathway, nitric oxide activates an enzyme that can convert many molecules of GTP into molecules of cGMP. cGMP is a small molecule that can diffuse through the cytoplasm and bind to an enzyme called protein kinase G (PKG). Binding of cGMP to PKG leads to a change in the confirmation of PKG that leads to its activation. What type of signaling molecule is cGMP?
A. adapter protein B. enzyme C. second messenger D. scaffold