One can inject dyes of different sizes into a liver cell and determine those molecules that can readily pass through gap junctions. What sized molecules can pass through gap junctions?
A. >1,000 Daltons, but <1,500 Daltons
B. >5,000 Daltons, but <10,000 Daltons
C. >10,000 Daltons
D. <1,000 Daltons
E. >1,500 Daltons, but <5,000 Daltons
Answer: D
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What genetic elements can increase the misalignment of homologous chromosomes?
A. RNA polymerase B. promoter elements C. enhancer elements D. transposable elements E. topoisomerase
Which of the following molecules does not act as a second messenger?
a. protein kinase b. IP3 c. DAG d. calcium ions e. cyclic AMP
Immature seed cones of conifers are usually green before pollination, and flowers of grasses are inconspicuously colored. What does this indicate about their pollination?
A) They self-fertilize and do not need pollen carried from one plant to another. B) Their pollinating insects are color blind. C) They are wind pollinated. D) They probably attract pollinators using strong fragrances.
The ____ a photon’s wavelength, the ____ its energy.
A. shorter; greater B. longer; greater C. shorter; less D. longer; more variable E. shorter; more variable