Before mRNA can be used in translation (the making of a new protein), nonfunctional segments of the gene that have been transcribed into the strand of pre-mRNA have to be "edited" out. The nonfunctional parts of the gene are cut out (and the functional parts spliced together) by a special type of enzyme. What are these enzymes called?
a) introns b) exons c) genomes d) snRNPs ("snurps") e) polyribosomes
d) snRNPs ("snurps")
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In general, molecules consisting only of carbon and hydrogen atoms are called ____
a. hydrocarbons b. carbohydrates c. polymers d. functional groups e. organic molecules
A motor neuron and all the muscle fibers under its
control is a __________ unit. a. neuromuscular b. movement c. muscle d. motor e. coordination
During the cell cycle, the cell goes through a stage called "G." In this case, "G" stands for
a. gap. b. goal. c. gad. d. glad. e. game.
Why are dideoxyribonucleoside triphosphates used during DNA sequencing?
(a) They cannot be incorporated into DNA by DNA polymerase. (b) They are incorporated into DNA particularly well by DNA polymerases from thermophilic bacteria. (c) Incorporation of a dideoxyribonucleoside triphosphate leads to the termination of replication for that strand. (d) Dideoxyribonucleoside triphosphates are more stable than deoxyribonucleoside triphosphates.