At the point in the cell cycle when mitosis begins
A) DNA replication begins.
B) each chromosome consists of two identical chromatids joined at the centromere.
C) the number of chromosomes is reduced to half.
D) the cell enters a dormant phase.
B) each chromosome consists of two identical chromatids joined at the centromere.
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Antibody-mediated responses work against _____
a. intracellular pathogens b. extracellular pathogens c. cancerous cells d. both intracellular pathogens and extracellular pathogens e. both extracellular pathogens and cancerous cells f. intracellular pathogens, extracellular pathogens, and cancerous cells
At a given locus, homologous chromosomes have
A. the same genes but can have different alleles. B. the same genes and alleles. C. different genes and alleles. D. different genes, but can have the same alleles.
In a normal, healthy individual, at which time would cortisol secretion be highest?
a. early morning b. late morning c. mid-day d. evening e. middle of the night
Which of the following individuals pioneered the use of chemicals to reduce the incidence of infections during surgery?
A. Nightingale B. Snow C. Ehrlich D. Lister E. Semmelweis