In the avian and mammalian eye, the lens remains stationary but changes shape in order to focus on objects at various distances. This is called "accommodation" and is accomplished through adjusting muscle control of the lens in order to
A. alter the sensitivity of the eye to varying light levels.
B. control the amount of light admitted to the eye through the pupil.
C. bend light rays to varying degrees according to the angle at which light enters the eye.
D. convert light energy into electrical signals by the retina.
E. regulate the vitreous humor volume.
C. bend light rays to varying degrees according to the angle at which light enters the eye.
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Middle eastern respiratory syndrome (MERS) is caused by
A) Streptococcus pneumoniae. B) the influenza virus. C) a coronavirus. D) a rhinovirus.
All of the following are components associated with the bacterial cytoskeleton except
A) FtsZ. B) MreB. C) plaktin. D) crescentin. E) both choices B and C
Which of the four major chemicals found in cells comprise telomeres?
A) Carbohydrates B) Lipids C) Proteins D) Nucleic acids
This organism is a
a. bivalve. b. gastropod. c. chiton. d. cephalopod. e. nudibranch.