Nondisjunction may result in a person with twenty-three pairs of chromosomes
A. plus an extra chromosome.
B. minus a sex chromosome.
C. with an extra chromosome number 21.
D. All of these answers are true.
D. All of these answers are true.
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The minimum level of depolarization required to initiate an action potential in an excitable cell is
called the
a. electrical potential. b. refractory potential. c. membrane potential. d. resting potential. e. threshold potential.
A bacterium undergoes four rounds of replication. How many cells would result, and how many of
those cells would still have part of an original DNA strand from the starting bacterium ? What will be an ideal response?
Malaria is caused by Plasmodium falciparum, a non-motile protist that contains a cluster of microtubules at one end of the cell. Once injected into the blood stream, these microtubules are used to attach to red blood cells. Plasmodium falciparum is which of the following?
a. A protozoa b. An algae c. A slime mold d. A diatom e. An apicomplexan
The hypothesis that closely matches the data provided is:
A. spiders are the top predators on all islands. B. herbivorous insects survive best on islands where spiders and centipedes live. C. herbivorous insects and spider populations are decreased by centipedes. D. herbivorous insects feed on spiders and centipedes.