What would happen if snRNPs did not recognize the branch point within an intron?
A. snRNPs would not base-pair with the 5' end of the intron.
B. A lariat would not form.
C. A 3' poly A tail would not be added to the transcript.
D. A 5' cap would not be added to the transcript.
Answer: B
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Temporal summation is a response to the:
A. location of synapses over the surface of a postsynaptic neuron. B. frequency of stimulation of a postsynaptic cell. C. amount of neurotransmitter released from a presynaptic cell. D. density of ligand-gated channels on the postsynaptic cell.
Which of the following is a correct interpretation of the wings of bats and the wings of birds?
a. they are homologous because the common ancestor of bats and birds had wings b. they are not homologous because their similar internal bone structure evolved independently as an adaptation for flight c. they are homologous because they are adapted for the same function d. they are homologous because they have similar internal bone structure inherited from a common ancestor e. they are not homologous because wings evolved from different ancestral organs in birds and bats
At an inhibitory synapse
a. no neurotransmitter is released by the sending cell. b. a neurotransmitter produces changes in the receiving cell that drives the membrane potential away from threshold. c. no neurotransmitter can bind to the receiving cell. d. a neurotransmitter produces changes in the receiving cell that drives the membrane potential closer to threshold. e. a neurotransmitter restores the resting potential.
Which nitrogenous base percentage is complementary to the 22% guanine found in a double-stranded DNA molecule?
A) 22% thymine B) 22% cytosine C) 44% adenine D) 48% thymine