Which statement is NOT true about water uptake in a plant root?
A. Water enters the root from the soil by osmosis.
B. Water enters the cytoplasm of the root hairs by active transport.
C. Water must enter the cytoplasm of the endodermal cells to get past the Casparian strip.
D. Water travels by diffusion through the cell walls of the epidermis and cortex.
Answer: B
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Which of the following is not coded for by the retroviral genome?
A. viral coat proteins B. tRNA C. reverse transcriptase D. integrase E. envelope protein
Freshwater fish are _____ with respect to osmoregulation.
A. hypertonic regulators B. isotonic conformers C. hypotonic regulators D. hypertonic conformers E. hypotonic conformers
Which statement best reflects the main difference between the genomes of bacteria, archaea, and eukaryotes?
A. Eukaryotes have larger genomes than bacteria and archaea since they are larger cells. B. Pathogens have larger genomes than non-pathogenic microbes since genome size is generally dependent on the presence of pathogenicity islands. C. Eukaryotes have a high gene density compared to bacteria and archaea since their genes contain introns. D. Intracellular parasites have the smallest genomes since they have evolved to lack genes that code for the synthesis of essential metabolites.
Regarding the evolutionary history of organisms,
A. in most cases it is impossible to determine a species' close evolutionary relatives. B. as new information is discovered, our understanding of the evolutionary history of organisms will change. C. there are few techniques that allow us to develop evolutionary histories for organisms. D. All of these answers are true.