Of the G3P generated in the Calvin cycle, 5/6 will be used to regenerate RuBP. A company
manufacturing widgets would go out of business if 5/6 of the widgets were recycled at the
manufacturing site rather than being sold. And yet plants survive this extreme inefficiency. Why?
a. Actually, 5/6 of the G3P is used to build glucose and only 1/6 of the G3P is needed to
regenerate RuBP.
b. Plants are extremely efficient in other ways and that compensates for this anomaly.
c. There is unlimited CO2 for the plant to use, so it's okay to "waste" some by regenerating
RuBP.
d. The plant expends no energy to acquire the light energy that drives the Calvin cycle, so
there is no pressure on the system to become more efficient.
e. The cyclic pathway of the light reactions compensates for the energy lost in RuBP
regeneration.
D
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Which of the following molecules coordinates the expression of nonadjacent genes?
A) leucine zippers B) response elements C) transcription factors D) coactivators E) control elements
Reptiles are ectotherms, so they cannot generate their own body heat. Which of the following is an adaptation, similar to hibernation, that allows reptiles to survive periods where temperatures are cold?
a. cryptobiosis b. diapause c. brumation d. aestivation
Reef systems
a. be all be destroyed within 30 years. b. are formed from calcium carbonate secreted by coral polyps. c. have symbiotic dinoflagellates in the living coral. d. have shown widespread bleaching; death of corals is being reported worldwide. e. include all of these.
Which of the following is a true statement regarding mitosis?
(A) Replication of chromosomes occurs at the start of mitosis (B) Cytokinesis precedes alignment of replicated chromosomes along the equatorial plate (C) Replicated chromosomes pairs up in tetras prior to separation of chromatids (D) Mitosis plays a role in growth, repair, and asexual reproduction