The bodies of arthropods are supported mainly by

a. an exoskeleton.
b. only nonskeletal structures.
c. a hydrostatic skeleton.
d. an endoskeleton.
e. joined exo- and endoskeletons.


A

Biology & Microbiology

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What information is critical to the success of polymerase chain reaction (PCR) itself?

A) The DNA sequence of the ends of the DNA to be amplified must be known. B) The complete DNA sequence of the DNA to be amplified must be known. C) The sequence of restriction-enzyme recognition sites in the DNA to be amplified must be known. D) The sequence of restriction-enzyme recognition sites in the DNA to be amplified and in the plasmid where the amplified DNA fragment will be cloned must be known.

Biology & Microbiology

The iceberg effect refers tot he fact that____

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

Biology & Microbiology

The first step of an action potential, when the membrane potential of a neuron shifts from negative to positive due to inward movement of sodium ions, is referred to as ________

Fill in the blank(s) with correct word

Biology & Microbiology

The experimental design in the accompanying figure was used to examine:


a. the relationship between genetic changes and metabolic enzymes.
b. the mutation rate of Neurospora.
c. resistance of Neurospora to genetic poisons.
d. toxicity of arginine metabolites.
e. growth of Neurospora in the presence of different antibiotics.

Biology & Microbiology