If two genes are homologous, then it can be said that they are
A. derived from different ancestral genes but have a similar function.
B. derived from the same ancestral gene.
C. found only outside the nucleus in the mitochondrion or chloroplast.
D. derived from different ancestral genes and have different functions.
E. related through environmental natural selection.
B. derived from the same ancestral gene.
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The hard mineral defense of silica plates found in some grasses is effective because:
A. silica does not taste good, so herbivores don't feed on the grass that contains it. B. silica is abrasive and it wears down insect mouth parts, so insects feed less efficiently and more slowly. C. silica is a chemical defense that is toxic to most herbivores. D. silica is able to be consumed by herbivores and used to deter their predators. E. silica binds to proteins and prevents their uptake from the guts of herbivores.
In garden peas, one pair of alleles controls the height of the plant, and a second pair of alleles controls flower color
The allele for tall (D) is dominant to the allele for dwarf (d), and the allele for purple (P) is dominant to the allele for white (p). A tall plant with white flowers crossed with a dwarf plant with purple flowers produces 1/4 tall purple, 1/4 tall white, 1/4 dwarf purple, and 1/4 dwarf white. What is the genotype of the parents? What will be an ideal response?
The most common form of gene expression regulation in both bacteria and eukaryotes is
a. translational control b. transcriptional control c. control of passage from the nucleus d. post-transcriptional control e. post-translational control
Which of the following cell types does not move materials through the body of the plant?
A. sclerenchyma B. sieve tube members C. xylem vessel members D. tracheids E. sieve cells