The "backbone" of a nucleic acid molecule is made of
A) lipids.
B) NAD+ and FAD.
C) amino acids.
D) ATP molecules.
E) sugar and phosphate groups.
E
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Facilitated diffusion is an important method for cells in obtaining necessary molecules and removing other ones. Requirements for facilitated diffusion include
A. The carrier molecule must be specific to the molecule that is transported. The direction of movement is always with the concentration gradient, never against the gradient. B. The carrier molecule is nonspecific to the molecule that is transported. The direction of movement is always with the concentration gradient, never against the gradient. C. The carrier molecule is nonspecific to the molecule that is transported. The direction of movement is always against the concentration gradient, never with the gradient. D. The carrier molecule must be specific to the molecule that is transported and an ATP molecule must be attached to the specific carrier. The direction of movement is always against the concentration gradient, never with the gradient.
The breast muscle of turkeys and chickens is usually referred to as light meat, whereas that of wild ducks and geese is described as dark meat. Which of the following is consistent with this observation?
A. Turkeys and chickens are not closely related to ducks and geese. B. Turkeys and chickens do not use their breast muscle, ducks and geese do. C. Turkeys and chickens do not fly for sustained periods, whereas wild ducks and geese do. D. The muscles of ducks and geese do not contain myosins. E. The darker body color of ducks and geese provides protective camouflage against predators.
Which of the following is a hormone produced in the posterior pituitary that increases water absorption
in the kidneys?
a. atrial natriuretic factor b. renin c. aldosterone d. antidiuretic hormone e. angiotensin
The ultracentriguge is an important piece of lab equipment frequently used by cell biologists. What are some applications for the ultracentrifuge? choose one or more
A.) determining whether prokaryotic cells are bacteria or archaea B.) separating isomers of 6-carbon sugars from each other C.) separating different cellular organelles from each other D.) determining the sequence of (linear order of) monomers in a macromolecular polymer