Which is the first and largest blood vessel that carries oxygenated blood to the systemic circuit?
A. Aorta
B. Superior vena cava
C. Coronary arteries
D. Pulmonary artery
E. Carotid artery
Answer: A
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What is the difference between covalent bonds and ionic bonds?
A) Covalent bonds require carbon while ionic bonds do not. B) Covalent bonds involve the sharing of pairs of electrons between atoms; ionic bonds involve the sharing of single electrons between atoms. C) Covalent bonds involve the sharing of electrons between atoms; ionic bonds involve the electrical attraction between charged atoms. D) Covalent bonds involve the sharing of electrons between atoms; ionic bonds involve the sharing of protons between charged atoms. E) Covalent bonds involve the transfer of electrons between charged atoms; ionic bonds involve the sharing of electrons between atoms.
Which of the following alternate forms of nucleic acids are not known to be biologically important?
A. G tetraplex structures can form and act as recognition sites for enzymes that cleave DNA. B. Inverted repeats can form hairpins that are important for slowing or preventing protein synthesis. C. Palindromic sequences can act as recognition sites for enzymes that cleave DNA. D. Sequence-induced bending of the DNA can act as a binding site for transcription factors. E. Cruciform structures are formed during recombination.
Menstruation begins in response to
a. rising levels of FSH and LH. b. falling levels of estrogen. c. falling levels of progesterone. d. falling levels of estrogen and progesterone. e. GnRH secretion.
What characteristic describes wind-pollinated plants?
A. red flowers to attract birds B. small, greenish flowers C. growth in close proximity to each other D. small, greenish flowers and growth in close proximity to each other E. All of these are correct.