What is true of the differences between chemical and electrical synapses?
a. Signals across chemical synapses are sometimes bidirectional.
b. Electrical synapses are only found in the brain.
c. Neurons are physically connected across electrical synapses.
d. Only charged ions can travel across electrical synapses.
c. Neurons are physically connected across electrical synapses.
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Both DNA and RNA _____
A) are information-containing molecules B) show primary, secondary, tertiary, and quaternary structure C) are highly reactive catalysts in cells D) naturally occur as a double helix
Dormancy can be triggered by
a. low Pfr levels. b. the production of abscisic acid. c. nitrogen deficiency and low soil moisture. d. cold nights. e. all of these.
Biological growth involves an increase in:
a. the number of cells. b. the size of individual cells. c. the number of gene types in a cell. d. both the number and size of cells. e. both the number of cells and the number of gene types in a cell.
Chlamydia trachomatis produces a dormant, resistant stage which is transmitted from one host to another.
Answer the following statement true (T) or false (F)