The molecule currently being investigated as a possible means of synthesis of the first proteins is:
A. mRNA.
B. DNA.
C. tRNA.
D. rRNA.
E. aminoacyl tRNA synthetases.
Answer: D
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The stretch reflex is
a. one of the spinal reflexes b. activated by stretch-sensitive receptors inside the muscle spindles. c. a simple, stereotyped, and repeatable motor action. d. elicited by a sensory stimulus. e. all of these.
The post Darwinian view of the world includes which of the following idea(s)?
A. species are related by descent. B. the age of the Earth is billions of years old. C. an interaction of random variation and environmental conditions produce environmental adaptation. D. All of the choices are correct. E. Only two of the answers are correct.
Mina had a throat infection; in a few days it had spread to her ear. What part of her ear would be affected first?
A) external auditory canal B) pinna C) inner ear D) middle ear
Cell size is limited because _________ is critical to a cell's function
A) the size of the nucleus B) the ability to photosynthesize C) the number of microvilli D) surface-area-to-volume ratio E) cilia movement