Corneal surgery is now routinely performed to change the shape of the cornea and improve vision. This surgery is beneficial because it _____
A) improves the circulation of nutrients to the eye
B) improves the focusing of light onto the retina
C) decreases the amount of light entering the eye
D) increases the sensitivity of the photoreceptors
B
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Which of the following components is not associated with the primary cell wall?
A) cellulose microfibrils B) hemicelluloses C) pectins D) glycoproteins E) lignins
A person with an autosomal recessive disorder generally has how many copies of the dominant allele?
a) Two, on the X chromosome b) Two c) Zero d) Two, on the Y chromosome e) One
Which statement best describes the cause of decompression sickness?
A) Oxygen molecules are so tightly compressed due to pressure exerted by the water column that they cannot deliver oxygen to the tissues. B) The oxygen molecule expands upon ascent and bursts, therefore causing a lack of oxygen to the tissues. C) Carbon dioxide is driven into the cardiovascular system and causes acidosis. D) Nitrogen gas bubbles form in the blood, joints, and nervous system as pressure decreases from too fast an ascent. E) Carbon dioxide bubbles come out of solution too quickly and burst blood vessels, especially in the brain.
The genetic code is ________
A) our DNA - what makes us who we are B) our genome C) the complementary base-pairing of A going with T and C going with G D) what allows codons to be translated into amino acids