Arrival of an action potential at a presynaptic cell's axon terminals triggers the release of __________,
a type of chemical signal. Fill in the blank(s) with the appropriate word(s).
neurotransmitter
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Which of the following describes a plant shoot growing upward?
a. positive gravitropism b. negative thigmotropism c. negative gravitropism d. positive feedback
Transcription and translation can be coupled in bacteria but not eukaryotes because
A) no nuclear membrane exists in prokaryotes. B) no nuclear membrane exists in eukaryotes. C) the bacterial DNA is in a single chromosome. D) eukaryotic chromosomes are found in nucleoids.
Clay is considered a possible site for early polymerization because it binds organic monomers and contains zinc and
iron ions that may have functioned as ATP. ______________ Indicate whether the statement is true or false.
Instead of being trained as a biologist, Charles Darwin actually received a ________ degree
Fill in the blank(s) with correct word