Which cells typically have cell cycles lasting several months?
a) mammalian liver tissue
b) cells in a cleaving frog embryo
c) nerve cells
d) both cells in a cleaving embryo and mammalian embryo cells
e) mammalian embryo cells
Ans: a) mammalian liver tissue
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If chromosomal DNA from a host is the only type of DNA carried by a transducing particle, what can be concluded regarding transduction in this case?
A. Transduction in this case is neither generalized nor specialized. B. Transduction in this case could be generalized or specialized depending on the phage involved. C. Transduction in this case is generalized rather than specialized. D. Transduction in this case is specialized rather than generalized.
What is found between the primary walls of adjacent cells for cells to adhere tightly to one another?
a. collagen b. cytosol c. middle lamella d. secondary cell wall e. intermediate filaments
In trying to determine whether DNA or protein was the genetic material, Hershey and Chase made use of which of the following facts about these two types of molecules?
A. DNA contains phosphorus, whereas protein does not. B. DNA contains nitrogen, whereas protein does not. C. DNA contains sulfur, whereas protein does not. D. DNA contains purines, whereas protein includes pyrimidines.
Which of the following statements about M protein is FALSE?
A) It is found on Streptococcus pyogenes. B) It is found on fimbriae. C) It is heat- and acid-resistant. D) It is readily digested by phagocytes. E) It is a protein.