The mitochondrial protein presequence is cleaved off by a protease called
a. signal peptidase.
b. presequence protease.
c. ubiquitin-targeted protease.
d. matrix-processing protease.
Ans: d. matrix-processing protease.
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A cell containing two identical copies of a pair of homologous chromosomes undergoes meiosis, during which the non-sister chromatids in that pair crossover, exchanging a gene that controls the rate of cellular metabolism. After the resulting gametes combine with others to form a zygote, what will the effect of this crossover be?
a. The metabolism of the new organism will be increased. b. The organism will have inherited a defective copy of this gene. c. Exchanging identical genes will have no effect on metabolism. d. The metabolism of the new organism will be decreased.
Four of the five answers are traits that influence the life history pattern of a living organism. Select the exception
a. The age at which the organism begins to reproduce b. How often the organism reproduces. c. The number of offspring produced per reproductive event d. The length of the reproductive stage e. Natural disasters that influence survivorship
Explain how sex-limited genes are inherited and give an example of this type of inheritance. What will be an ideal response?
What plant group has the largest number of living species?
A) Seedless vascular plants B) Cone-bearing plants C) Flowering plants D) Seedless, nonvascular plants