Bacterial cell walls are primarily composed of which of the following?
A) phospholipid protein
B) protein
C) carbohydrate
D) peptidoglycan
Ans: D) peptidoglycan
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A fertilized egg is called a
A. zygote B. ovule C. oocyte D. blastocyst
Lymphocytes ignore which of the following in most
instances? a. cells coated with complement proteins b. cells with antigens on their surface c. “self” cells with MHC markers d. cells with both antigen and self-MHC markers e. cells with damaged or mutant self-MHC markers
What advantage do gymnosperms have over ferns?
A. Gymnosperms produce pollen and do not require water to reproduce. B. Gymnosperms have alternation of generations. C. Gymnosperms have a vascular system, which allows them to grow taller. D. Gymnosperms can grow larger gametophytes. E. Gymnosperms can produce flowers and fruits to aid in seed dispersal.
All of the following substances are effective against nonenveloped viruses EXCEPT
A) alcohol. B) chlorine. C) ethylene oxide. D) ozone. E) None of the answers is correct; all of these are equally effective against nonenveloped viruses.