What is the blind spot?
A) A part of the cornea
B) An area of the retina that has no receptor cells
C) A space in the vitreous humor
D) The part of the cerebral cortex that interprets action potentials from the eye
E) The hole where there is no iris
B
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Since Watson and Crick described DNA in 1953, which of the following might best explain why the function of small RNAs (miRNAs) is still not well understood?
A) As RNAs have evolved since that time, they have taken on new functions. B) Watson and Crick described DNA but did not predict any function for RNA. C) The functions of small RNAs could not be approached until the entire human genome was sequenced. D) Ethical considerations prevented scientists from exploring this material until recently. E) Recent advances in technology and our understanding of how DNA is expressed have made this possible.
Behaviors that appear to be genetically programmed are called
A. innate. B. ultimate. C. fixed action pattern. D. voluntary. E. standard deliverance.
What is the correct rank order for relative toxicity (most to least) of the primary nitrogenous wastes generated by different animals?
A. ammonia ? urea ? uric acid B. uric acid ? ammonia ? urea C. urea ? uric acid ? ammonia D. ammonia ? uric acid ? urea E. urea ? ammonia ? uric acid
Bacterial ribosomes are composed of several polypeptides and
A) three RNA molecules in two subunits. B) three RNA molecules in three subunits. C) two RNA molecules in two subunits. D) two RNA molecules in a single complex. E) one large RNA molecule in a single complex.