When RNA-dependent RNA polymerase is synthesizing mRNA it is functioning as a ________.
A. helicase
B. replicase
C. transcriptase
D. ligase
Answer: C
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The atmosphere performs several essential ecological functions. One of these is to:
a. protect Earth from all infrared radiation. b. reduce the amount of visible light reaching Earth c. provide plants with nitrogen needed for photosynthesis d. protect Earth from microwave radiation e. protect Earth from most ultraviolet radiation
Which of the following organisms have a cell wall composed of silicon?
a) cyanobacteria b) diatoms c) archaebacteria d) euglena e) dinoflagellates
A scientist is studying a population of crickets and finds that there is variation in the songs used by males to call for mates. Some males call with high-pitched three-chirp songs and some call with low-pitched four-chirp songs. However, offspring from the two types of males are able to interbreed so the scientist classifies the population as a single cricket species and goes on to another project. One year later a mutation arises in a female cricket that makes her unable to hear high frequencies. Ten years later a graduate student returns to the same cricket population and discovers that there are now two distinct cricket species in the area although they appear morphologically identical. What is the most likely explanation?
A. Gametic isolation has led to sympatric speciation. B. Habitat isolation has led to allopatric speciation. C. Temporal isolation has led to allopatric speciation. D. Mechanical isolation has led to sympatric speciation. E. Sexual selection has led to sympatric speciation.
Suppose the interior of the thylakoids of isolated chloroplasts were made acidic and then transferred in the dark to a pH 8 solution. What would most likely happen?
A) The isolated chloroplasts would make ATP. B) The Calvin cycle would be activated. C) Cyclic photophosphorylation would occur. D) The isolated chloroplasts would generate oxygen gas. E) The isolated chloroplasts would reduce NADP+ to NADPH. A) The isolated chloroplasts would make ATP. B) The Calvin cycle would be activated. C) Cyclic photophosphorylation would occur. D) The isolated chloroplasts would generate oxygen gas. E) The isolated chloroplasts would reduce NADP+ to NADPH.