A protein with an internal signal sequence is most likely to be located in:
A. the nucleus.
B. a mitochondrion.
C. the cytoplasm.
D. a chloroplast.
E. the extracellular space.
Answer Key: A
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A cross between two pea plants produces a population of 732 purple and 268 white plants. What is the genotype and phenotype of the parents that produced this population?
A. both parents heterozygous purple B. one parent homozygous purple, second parent homozygous white C. one parent heterozygous purple, second parent heterozygous white D. one parent heterozygous purple, second parent homozygous white E. one parent homozygous purple, second parent heterozygous white
Monoclonal antibodies obtained from a hybridoma provide
A. a large amount of an antibody that is specific for a particular epitope. B. a single antibody that recognizes many epitopes. C. many epitopes that recognize a specific antibody. D. a large number of B cells.
Which statement below is true about neurotransmitters?
A. The entry of neurotransmitter through K+ channels into neurons triggers the rising phase of the action potential B. Neurotransmitters are released from muscle cells to activate motoneurons in the presence of botulinum toxin C. Neurotransmitters are released from a neuron when action action potential reaches the end of its axon D. All of the above
DNA is tightly wound in a double helix for much of the time. What enzyme unwinds the double helix and be-gins transcription of RNA?
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