When a nerve impulse travels from neuron 1 to neuron 2, neuron 1 is known as the _____
a. postsynaptic neuron
b. presynaptic neuron
c. synapse
d. gated channel
e. dendrite
b
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An atom has 20 electrons and 20 neutrons. What is the mass of this atom?
A. 10 B. 20 C. 40 D. 80
In order for a species to be successfully reintroduced into an area,
a. hunting must be restricted. b. populations of the animals cannot be too small. c. suitable habitat must be maintained. d. all of these
A sequence similarity search reveals that a candidate gene’s sequence has a partial match to a known gene’s sequence
What does this most likely indicate?
a. There is no relationship between the candidate and known gene. b. The candidate gene encodes an identical transcript to the known gene. c. The candidate gene encodes the same protein as the known gene. d. The protein encoded by the candidate gene contains a protein domain also found in the known gene’s protein. e. The protein encoded by the candidate gene has the same function as the protein encoded by the known gene.
DNA sequence evidence suggests that plants, fungi, and animals arose from different lineages of unicellular protists. This suggests which of the following?
A. Protists arose before the other three kingdoms. B. Early ancestors to plants, fungi, and animals could interbreed. C. Multicellular organisms only arose once in evolutionary history. D. The animal, plant, and fungal kingdoms contain some single-celled organisms. E. All unicellular organisms are now extinct.