Helicase ____
a. proofreads the newly synthesized DNA
b. relieves over-twisting ahead of the DNA replication fork
c. rewinds the newly synthesized DNA strands into a double-stranded helix
d. unwinds the double-stranded DNA helix
e. binds DNA polymerase to the template strand
ANSWER: d
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a. mammals b. lizards c. turtles
d. crocodiles e. amphibians
In order to add a single amino acid to a growing polypeptide chain, a grand total of ________ molecules or ATP or GTP are utilized.
A. three B. four C. six D. two
All of the following are true of every cell of the early
human embryo EXCEPT that a. each has the same genes as all the others. b. each can give rise to an entire human. c. they are undifferentiated. d. all will differentiate alike. e. all have maternal messages.
The large central opening in the poriferan body is called the _____.
a) emmule b) picule c) stia d) osculum