The structural diversity of carbon-based molecules is based upon which of the following properties?
A. the ability of carbon to form four covalent bonds
B. the ability of those bonds to rotate freely
C. the orientation of those bonds in the form of a tetrahedron
D. None of these choices is correct. E. All of these choices are correct.
Answer: E
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The anticodon of a particular tRNA molecule is _____
A) complementary to the corresponding mRNA codon B) complementary to the corresponding triplet in rRNA C) the part of tRNA that bonds to a specific amino acid D) changeable, depending on the amino acid that attaches to the tRNA E) catalytic, making the tRNA a ribozyme
Which is the correct path that light takes from
the environment to the photoreceptors of a human eye?
a. cornea>>pupil>>lens>>vitreous body>>retina b. pupil>>cornea>>lens>>vitreous body>>retina c. cornea>>pupil>>lens>>retina>> vitreous body d. lens>>pupil>>cornea>>vitreous body>>retina e. cornea>>lens>>pupil>>vitreous body>>retina
Cells grown in a petri dish tend to divide until they form a thin layer covering the bottom of the dish. If cells are removed from the middle of the dish, the cells bordering the open space will begin dividing until they have filled the empty space. What does this experiment show?
A. Cells continue to grow as long as there is adequate space. B. The controls on cell growth and division can be turned on and off. C. When cells come into contact with other cells, they stop growing. D. Cell division can be regulated by factors outside of the cell. E. All of the answer choices are correct.
Normally, the colloid osmotic pressure produced by the concentration of blood proteins moves fluid from the ________ to the __________ by ____________.
A. blood; Bowman's capsule; osmosis B. blood; Bowman's capsule; simple diffusion C. Bowman's capsule; glomerulus; facilitated diffusion D. Bowman's capsule; blood; active transport E. Bowman's capsule; blood; osmosis