Which of the following structures function(s) to bend light rays?
A. iris and vitreous humor
B. ciliary body
C. choroid
D. rods and cones
E. lens and cornea
Answer: E
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Which of the following can only be viewed by electron microscopy?
A) frog eggs B) DNA C) nuclei D) mitochondria E) prokaryotes
Which of the following is physically the largest?
A. HIV B. RNA molecule C. E. coli cell D. Human T cell
You are an endocrinologist. A patient has been referred to you because he is cold all the time, even when the ambient temperature is 75°F. His throat is swollen. He also appears to heal slowly
You immediately suspect that his metabolic rate is slower than normal due to A) elevated calcitonin levels. B) elevated growth hormone levels. C) decreased parathyroid hormone levels. D) decreased thyroxine levels. E) elevated insulin levels.
Genes that jump from one location to another in the genome are
A. transformers. B. repressors. C. plasmids. D. transposons. E. operons.