Removal of the 5' G-cap of mRNA transcripts
A) prevents transcript transport.
B) leads to degradation by exonucleases.
C) extends mRNA half-life.
D) leads to polyadelylation.
E) reduces mRNA half-life.
B
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The number of major histocompatability (MHC) protein combinations possible in a given population is enormous. However, an individual in that diverse population has a far more limited array of MHC molecules because _____
A) the MHC proteins are made from several different gene regions that are capable of rearranging in a number of ways B) MHC proteins from one individual can only be of class I or class II C) each of the MHC genes has a large number of alleles, but each individual only inherits two for each gene D) once a B cell has matured in the bone marrow, it is limited to two MHC response categories E) once a T cell has matured in the thymus, it can only respond to two MHC categories
If a pedigree of several generations shows only females affected by a particular trait, it cannot be a(n) ____ trait
a. autosomal recessive b. autosomal dominant c. Y-linked d. X-linked recessive e. X-linked dominant
Long-distance runners like to train at high altitudes because the lack of oxygen there stimulates the
A) body to produce more lung tissue. B) capillaries to diffuse oxygen more slowly. C) muscles to contract faster. D) bone marrow to make more erythrocytes. E) muscles to contract less strongly.
When you breathe into a paper bag after hyperventilating, you are decreasing the amount of carbon dioxide in your blood.
Answer the following statement true (T) or false (F)