The ____ is the first phylum with three germ layers

a. Cnidaria
b. Platyhelminthes
c. Annelida
d. Arthropoda
e. Nematoda


ANSWER: b

Biology & Microbiology

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What is unusual about phage MS2 infection of Escherichia coli?

A) All proteins are synthesized simultaneously during infection so there are no early and late proteins. B) It attaches to the host's pilus rather than the cell's surface. C) It enters through a host cell porin. D) More than one MS2 phage can be present in an individual E. coli cell.

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Refer to Figure 24-1d. The function of the structure labeled 3 is:

a. attachment to a host cell.
b. locomotion.
c. mate recognition.
d. replication.
e. to take over host cell mechanisms

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All of the following processes are associated with embryonic development EXCEPT which one?

A) cleavage B) meiosis C) morphogenesis D) differentiation E) growth

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A single-ring nitrogenous base found in DNA and RNA

What will be an ideal response?

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