Which type of molecule can diffuse through the blood-brain barrier?
A) very small molecules
B) glucose molecules
C) hydrophilic molecules and glucose molecules
D) very small molecules and lipophilic molecules
E) lipophilic molecules
Answer: D
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Interphase is made up of what stages of the cell cycle?
A. G1 + G2 + S B. S + cytokinesis C. prophase + metaphase + anaphase + telophase D. cytokinesis + mitosis E. G0 + G1 + G2
Assume a neuron receives EPSPs and IPSPs from several adjacent neurons. How might that neuron's threshold
potential be reached, causing it to produce its own action potential?
a. if IPSPs outnumber EPSPs b. if IPSPs equal EPSPs c. if EPSPs outnumber IPSPs d. if the adjacent neurons contain many axon terminals e. if the receiving neuron contains many dendrites
Hereditary information is encoded in a single, circular DNA molecule in most prokaryotes. Which of
the following is FALSE regarding the bacterial chromosome?
a. The DNA of the bacterial chromosome is replicated prior to segregation. b. Bacterial cells can replicate their DNA very rapidly. c. Bacterial cells utilize a mitotic spindle to segregate their replicated DNA. d. The bacterial chromosome has genes that control binary fission. e. DNA replication begins at the origin of replication.
The motor neuron and the muscle fibers it controls are known as a ____
a. myofibril b. muscle unit c. sarcomere d. muscle tetanus e. motor unit