The first compound microscope was a simple tube with two lenses: The eyepiece (ocular lens) and the ________ lens.

Fill in the blank(s) with the appropriate word(s).


Answer: objective

Biology & Microbiology

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Polymerases also have nuclease activities. Which of the following is not a use for the nuclease activities of DNA polymerase I?

A. proofreading during synthesis B. trimming single-stranded ends C. removal of RNA primers D. degradation of viral DNAs E. removal of DNA lesions during repair

Biology & Microbiology

Membrane sterols such as cholesterol function in animal cell membranes to ____

a. increase the rate of diffusion b. store cellular energy c. facilitate ion transport d. maintain membrane fluidity e. receive chemical signals

Biology & Microbiology

The variable phenotypic expression shown in camptodactyly results from the interaction of ____________________

and ________________factors.Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

Which of the following is common to both avian and mammalian development?

A) holoblastic cleavage B) epiblast and hypoblast C) trophoblast D) yolk plug E) gray crescent

Biology & Microbiology