Hepaticophytes lack stomata and tracheids. What would provide evidence to justify their inclusion in the Bryophytes and not the Charophytes?
A. Cellulose in their cell walls
B. The use of chlorophyll
C. A haplodiplontic lifecycle
D. Genes for ABA signalling
Answer: D
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Epistasis and multiple alleles differ in that
A) epistasis is an interaction between two genes, and multiple alleles are variants of the same gene. B) epistasis affects males and multiple alleles occur in females. C) epistasis only occurs in genes that have multiple alleles. D) in epistasis one gene masks another, but one allele cannot mask the effect of another.
Parathyroid hormone (PTH)
a. stimulates osteoblasts to digest bone. b. stimulates the absorption of calcium in the kidneys. c. helps to inactivate vitamin D. d. is secreted from the thyroid gland. e. stimulates the release of intrinsic factor from the digestive tract
How might global warming affect an animal species that has narrow temperature requirements?
A) It may cause the expansion of the species' range. B) It may cause the extinction of the species. C) It may reduce the diseases that threaten the species. D) It may have no effect on the species.
Which of the following best supports the hypothesis that the difference in leaf color is genetically controlled?
(A) The number of yellow-leaved seedlings in dish A on day 7 (B) The number of germinated seeds in dish A on days 7 and 14 (C) The death of all the yellow-leaved seedlings (D) The existence of yellow-leaved seedlings as well as green-leaved ones on day 14 in dish B