Which of the following best describes the characteristics of the descending arm of the loop of Henle? (Select all correct choices.)
A. It is permeable to water.
B. It actively transports electrolytes.
C. It is impermeable to water.
D. Its filtrate is mainly urea.
E. Its filtrate becomes more and more
concentrated.
A,E
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How many cell types would we expect to find in the simple primary tissues of plants?
A. One or two simple cell types. B. Several cell types. C. Many cell types. D. This cannot be generalized.
Which of the following choices is an important function of lipids?
a. energy storage b. insulation c. all of the choices d. cell membrane construction
Mutations of regulatory elements of developmental genes may have either dominant or recessive effects. If a mutation results in a silencer element that negatively regulates, which do you expect?
A) a recessive effect in which cis elements are up-regulated B) a recessive effect in which cis elements are down-regulated C) a dominant effect in which the silencer down-regulates gene activity D) a dominant effect in which gene activity is up-regulated E) a dominant effect in which the silencer is trans-activating
Plastids originated from which of the following groups of prokaryotes?
A. Cyanobacteria B. Archaea C. Proteobacteria D. Actinobacteria E. Spirochaetes