Which theory states that eukaryotic organelles originated as prokaryotes that survived ingestion by a host cell and
ultimately evolved mutualistic relationships with the host cell?
a. endosymbiont theory
b. heterosymbiont theory
c. obligative symbiotic theory
d. facultative symbiotic theory
e. autotrophic symbiotic theory
a
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The polymerase chain reaction (PCR) is a technique used to produce many copies of a specific DNA sequence
a. True b. False
The bright red rash and fever of scarlet fever is due to ________.
A. exfoliative toxin B. hemolysins C. erythrogenic toxin D. enterotoxins E. toxic shock syndrome toxin
An animal's circulatory system should contain all of the following EXCEPT
a. blood to transport carbon dioxide and oxygen. b. blood vessels leading away from the heart. c. blood vessels leading to the heart. d. a heart to pump the blood. e. nitrogen to transport wastes
A gene that affects, prevents, or masks the expression of a gene at another locus is a(n) ____ gene
a. recessive b. dominant c. epistatic d. codominant e. pleiotropic