The most commonly used unit for measuring cell size is a ____
a. decimeter (dm)
b. centimeter (cm)
c. millimeter (mm)
d. micrometer (mm)
e. nanometer (nm)
ANSWER: d
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Chromosomes can be condensed into compact structures, visible with the light microscope, but usually only:
A. while the nuclear pores are open. B. while the proteins are being assembled. C. after the cell is dead. D. while the DNA is being copied into RNA. E. during cell division.
Ocean and lake water typically contain 107 virions/mL. Does this mean that swimming in or drinking this water will make you sick? Why or why not? How do these viruses impact human and environmental health?
What will be an ideal response?
Disruption of neural signaling can produce profound changes in mood and behavior. Cocaine exerts its effects by
A. blocking dopamine reuptake from synapses. B. blocking serotonin reuptake from synapses. C. preventing neurotransmitter vesicle fusion with presynaptic neuron membranes. D. blocking the enzyme acetylcholinesterase. E. binding to the GABA receptor to enhance inhibitory neurotransmission.
Permanently swollen veins, common in the legs and feet, are known as ________
Fill in the blank(s) with correct word