In humans, the muscular tube into which urine from the kidney first drains is the
A. urethra.
B. uvula.
C. ureter.
D. urinary bladder.
E. nephron.
C. ureter.
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Chromosomes exchange genetic information by
A. fertilization. B. mitosis. C. syngamy. D. DNA replication. E. crossing over.
The first, innermost energy shell of an atom
A. can have a maximum of 8 electrons. B. can have a maximum of 2 electrons. C. is called the 2p orbital. D. is called the 1s orbital and can have a maximum of 8 electrons. E. is called the 2p orbital and can have a maximum of 2 electrons.
G protein-coupled receptors are the largest family of cell surface receptors. Each receptor passes through the plasma membrane how many times?
A. Once B. Three times C. Five times D. Seven times
Which sigma factor, encoded by the rpoH gene, is active at high temperatures?
A) ?70 B) ?32 C) ?45 D) ?37 E) ?50