The human genome is divided into linear segments and packaged into structures called chromosomes. What is the total number of chromosomes found in each of the somatic cells in your body?
(a) 22
(b) 23
(c) 44
(d) 46
(d)
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In 1908, chemist Kikunae Ikeda identified a new taste modality he called "umami", or "delicious" in Japanese. It gives a savory flavor to meat, seaweed, and tomatoes. What molecule is responsible for umami?
A. Na+ ions B. H+ ions C. glutamate D. Mg+2 ions E. Fe+2 ions
How do bony fish regulate buoyancy?
A. With a protective operculum B. By constantly swimming at an upwards angle C. Through the calcium in the bones, which makes the skeleton lighter than the water D. With an air-filled swim bladder
Since the membrane is more permeable to K+ than to Na+,
Select one: a. there are always more positive ions outside the membrane than inside. b. there are always more negative ions outside the membrane than inside. c. the outside of the membrane is always negative. d. the outside of the membrane is always neutral. e. there really is never a resting potential. Feedback
In a particular DNA sequence, nonsynonymous substitutions occurring at a lower rate than synonymous substitutions would be evidence for
a. neutral evolution. b. negative selection. c. genetic hitchhiking. d. positive selection. e. mutational bias.