Prior to the early 1900's, why did surgeons refuse to wash their hands?
A) There were few infections so it did not seem necessary.
B) They wore thick gloves so the risk to patients was small.
C) It was simply too time consuming.
C) It was simply too time consuming.
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Mollusk eyes and vertebrate eyes are
A. analogous structures, because they arise from the same structures during development. B. analogous structures, because they have the same function but derive from different common ancestors. C. homologous structures, because they have different functions. D. homologous structures, because they are derived from the same common ancestor.
Which of the following is one of the two main
functions of the nuclear envelope? a. provides residence for ribosomes b. allows separation of DNA from cytoplasm machinery c. provides total isolation of nuclear components d. enables faster cell division e. enables larger cell size
On which of the following is natural selection based?
a. genotype b. populations c. phenotype d. alleles e. genes
Genetic analysis indicates that an unknown organism contains a gene that codes for a defective form of telomerase. Based on this information alone, you can conclude that this organism
A. is eukaryotic. B. is prokaryotic. C. has unusually long telomeres. D. has an increased risk of developing cancer.