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
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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
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
The variable phenotypic expression shown in camptodactyly results from the interaction of ____________________
and ________________factors.Fill in the blank(s) with the appropriate word(s).
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