Photoperiodism in Arabidopsis thaliana depends on which of the following factors? Select all correct choices
A. the activation of photoreceptors
B. daily fluctuations of CONSTANSmRNA
C. daily fluctuations of AUXIN mRNA
D. the accumulation and stabilization of
CONSTANS
E. the accumulation and stabilization of
AUXIN
F. the inhibition of phytochrome
A,B,D
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The most common source of DNA mutation is
a. cigarette smoke b. UV light c. errors in DNA replication d. errors in protein synthesis e. pesticides on the food we eat
Articular discs (menisci)
What will be an ideal response?
Where did the first life on Earth evolve?
A. in the ocean B. Scientists do not know. C. on land D. somewhere else in the universe E. in a freshwater habitat
What would probably happen if a long neuron had one continuous myelin sheath down the length of the axon with no nodes of Ranvier?
A) The action potential would be propagated nearly instantaneously to the synapse. B) There could be no action potential generated at the axon hillock. C) The signal would fade because it is not renewed by the opening of more sodium channels.