Factors that can alter the level of expression of a gene include
_____ an increase in environmental temperature.
_____ an increase in salinity.
_____ exposure to UV radiation.
_____ presence of a particular energy substrate.
__X__ an increase in environmental temperature.
__X__ an increase in salinity.
__X__ exposure to UV radiation.
__X__ presence of a particular energy substrate.
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At one end of a tRNA molecule is a sequence of 3 nucleotides called an anticodon that ____
a. signals the production of a ribosome b. signals the unwinding of the DNA coils c. initiates the movement of mRNA out of the cell nucleus and into the cytoplasm d. binds to its anti-complementary tRNA codon e. binds to its complementary mRNA codon
Pharmacogenomics
a. seeks to customize drugs to the cellular proteomes of a patient. b. might target specific disease mechanisms and thus minimize side effects. c. would account for an individual's metabolism. d. would require a person's genetic profile to be determined and subsequently stored in some database. e. all of the above
Four of the five regions listed below are located
within the spinal cord. Select the exception. a. dorsal root ganglion b. interneurons between sensory input and motor outputs c. major ascending and descending nerve tracts d. interneurons connecting with other neurons e. direct reflex connections between sensory and motor neurons
Which event of fertilization occurs first?
A. the acrosomal reaction B. the entry of sperm DNA into the egg C. the cortical reaction D. cleavage E. vitelline layer hardens