The nucleotide that is present in RNA but not DNA is
A) thymine.
B) uracil.
C) adenine.
D) cytosine.
E) guanine.
B) uracil.
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To reproduce, many plants produce seeds-structures containing embryonic offspring along with nutrients inside a tough case. These offspring develop after being released by the parent plant
To which animal reproductive strategy is seed production most comparable? A) oviparous reproduction B) ovoviviparous reproduction C) viviparous reproduction
Spider crabs are an osmoconforming species, which likely means:
A. they have the same temperature as their environment. B. they regulate their temperature within their environment. C. they have the same solute concentration as their environment. D. they regulate their solute concentration within their environment.
In addition to its white coloration, beluga whales possess another unique characteristic which is: a. the ability to forage in groups
b. the ability to bend its neck. c. the formation of a tusk d. the presence of two teeth.
Which statement about chemical or electrical synapses is true?
a. Electrical synapses require a neurotransmitter. b. In electrical synapses, presynaptic and postsynaptic neurons are separated by synaptic clefts. c. Electrical synapses store excess ions in synaptic vesicles. d. In chemical synapses, presynaptic and postsynaptic neurons are connected by a protein channel. e. Electrical synapses involve the transfer of ions from presynaptic to postsynaptic neurons