Rhodopsin in the vertebrate retinal photoreceptor cells results in a change in the second messenger _______, leading to the opening of ion channels in the plasma membrane and the production of a nerve impulse.
a. Ca2+
b. cAMP
c. cGMP
d. IP3
Answer: c. cGMP
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A nucleosome consists of
A. a stretch of DNA. B. an RNA molecule. C. a ribosome and RNA. D. a stretch of DNA and histones. E. two or more closely related genes.
What happens to air as it is cooled?
a. It rises. b. It sinks. c. It moves horizontally. d. It moves at a faster speed. e. It does none of these
A ________ is one who believes that major evolutionary change happens, or can happen, by large "jumps" or bursts, such as mutations with large effects
Fill in the blank(s) with correct word
Which of the following describes the correct path of light in a compound light microscope, from the illumination source to the eye of the observer?
a. Condenser lenses ? prism ? specimen ? objective lenses ? body tube ? ocular lens ? eye b. Ocular lens ? body tube ? condenser lens ? specimen ? objective lens ? prism ? eye c. Objective lenses ? specimen ? condenser lenses ? body tube ? prism ? ocular lens ? eye d. Condenser lenses ? specimen ? objective lenses ? body tube ? prism ? ocular lens ? eye