When Calvin injected 14C labeled CO2 into cultures of green algae, what result was obtained because the molecule accepting the CO2 was unstable?
A. Radioactivity first appeared in glucose.
B. Radioactivity appeared last in 3-phosphoglycerate.
C. Radioactivity first appeared in ribulose bisphosphate.
D. Radioactivity appeared last in ribulose bisphosphate.
E. Radioactivity first appeared in 3-phosphoglycerate.
F. Radioactivity appeared last in glucose.
E. Radioactivity first appeared in 3-phosphoglycerate.
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Bacterial plasmids
A. are essential for growth. B. can provide genes that allow the bacteria to grow and thrive in the presence of potential toxins. C. are essential for cellular respiration. D. are artificially created by humans and are present in bacteria only because humans put them there. E. are essential for chromosome replication and binary fission.
What sensory receptors sense stimuli that arise from within the body?
A. gustatory receptors B. photoreceptors C. interoreceptors D. ampullae of Lorenzini E. exteroreceptors
Transcription factors bind to _____
a. promoters b. stop codons c. start codons d. poly-A tails e. introns
Prokaryote means before the nucleus, but what general feature co uld prokaryotes also be said to lack? What will be an ideal response?