Alterations to DNA sites such as promoters and operators can act

A) only in cis.
B) only in trans.
C) either in trans or in cis.
D) These terms apply only to posttranscriptional regulation.


A) only in cis.

Biology & Microbiology

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The transition from the gametophyte into the sporophyte generation occurs at the point in Figure 27-2 labeled:


a. 1.
b. 4.
c. 6.
d. 8.
e. 9.

Biology & Microbiology

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.

Biology & Microbiology

The process of incineration is used for

A. sterilization. B. degerming. C. disinfection. D. sanitization. E. both disinfection and sanitization.

Biology & Microbiology

Which of the following terms DOES NOT describe a basic type of protistan nutrition?

A. phagotrophic B. autotrophic C. osmotrophic D. eutrophic E. mixotrophic

Biology & Microbiology