Which one of the following statements about rickettsias is false?
A) Diseases caused by rickettsias are arthropodborne.
B) Rickets is caused by a Rickettsia species.
C) Rickettsia species cause typhus and typhuslike diseases.
D) Rickettsias have leaky membranes.
Answer: B
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In overdominance, the _______ genotype is beneficial over the _______ genotypes
A. heterozygous, homozygous B. homozygous, heterozygous C. homozygous dominant, homozygous recessive D. homozygous recessive, homozygous dominant E. incomplete dominant, codominant
Genetic engineering has
A. reduced genetic diversity. B. expanded scientists' ability to modify domesticated plants and animals. C. created entirely new species. D. produced interspecific hybrids.
While they are simple relative to cells, viruses often have a very diverse collection of components. Which one of the following choices is LEAST likely to be found as part of a virus?
A. proteins with functional binding sites B. glycoproteins C. single-stranded DNA D. ribosomes E. membrane components
Sam suffered a stroke in which one of the main branches of this vessel going to the brain was blocked
A) carotid artery B) jugular vein C) coronary artery D) renal vein