Chytrids are unique among fungi because they are the only ones that have ________
a. symbiotic relationships in lichens
b. flagellated cells
c. zygospores
d. sexual reproduction
b
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Genes organized into an operon are beneficial to certain bacteria because the operon allows for
A. differential regulation of individual genes that encode proteins with a common function. B. coordinated regulation of a group of genes that encode proteins with a common function. C. separate regulation of individual genes that encode proteins with different functions. D. coordinated regulation of a group of genes that encode proteins with different functions. E. coordinated regulation of a group of proteins involved in numerous cellular activities.
Nondisjunction during mitosis leads to:
a. an individual with a clone of abnormal cells. b. an individual with all abnormal cells. c. death of the daughter cells. d. nonviable sperm. e. normal daughter cells.
Mutation frequency is the
A) number of mutations per gene per generation. B) number of mutations per nucleotide per generation. C) number of mutations per cell per generation. D) number of a specific mutation in a defined population. E) total number of mutations in a defined population.
The present rate of species loss ________
A) suggests that about 25% of all plant and animal species may be extinct by the end of the century B) is about the same as it has been during the last 100,000 years C) is as much as 100 times higher than at any time in the last 100,000 years D) is slower than in recent years because of conservation efforts