Eukaryotic mRNA molecules may contain noncoding sequences that must be removed before translation. These are called
A. noncodons.
B. exons.
C. nucleosomes.
D. anticodons.
E. introns.
Answer: E
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Which of the following represents the correct sequence of cell types through which an electrical signal would pass in a reflex arc?
A. sensory neuron ? interneuron in the CNS ? motor neuron B. motor neuron ? interneuron in the PNS ? sensory neuron C. sensory neuron ? motor neuron ? interneuron in the CNS D. motor neuron ? sensory neuron ? interneuron in the PNS E. sensory neuron ? motor neuron ? interneuron in the CNS
Now extinct, several lineages of ____ appear in the fossil record from the Ordovician through the
Devonian periods. These jawless fishes had skin heavily armored with bony plates and scales, and imprints of some of their fossils indicate that their brains had three regions.
a. acanthodians b. conodonts c. osteolepiforms d. placoderms e. ostracoderms
A number of _______ worms release cysts and eggs through the feces
Fill in the blank(s) with the appropriate word(s).
A _______________ molecule connects two ribose sugars together in an RNA molecule. Fill in the blank(s) with the appropriate word(s)