Cnidarians have an outer layer derived from ectoderm, an inner layer from endoderm, and a ____
a. middle layer of mesoderm
b. watery middle layer
c. well-developed brain
d. jellylike matrix in between
e. complete gut
d
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Under anaerobic conditions, pyruvate can be broken down by ____
Fill in the blank with the appropriate word.
The enzyme that builds a short complementary piece of RNA at the start of each DNA segment to be replicated is
A. ligase. B. DNA polymerase. C. ATP synthase. D. helicase. E. primase.
Which disease is dangerous to the embryo if the
mother develops the disease early in pregnancy? a. German measles b. chicken pox c. red measles d. hepatitis e. mumps
The horizontal gene transfer (HGT) process that occurs when naked plasmids are incorporated into bacterial cells is:
a) conjugation b) transduction c) transformation d) restriction