Which of the following dissociates completely in solution and is considered to be a strong base (alkali)?
A) HCl
B) NH3
C) H2CO3
D) NaOH
D
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A hormone binds a receptor and activates the cAMP signal transduction pathway ultimately leading to the cell response. If you wanted to develop a drug to block this pathway, the drug would need to inhibit _____
A. hormone release from the receptor. B. adenylyl cyclase. C. protein phosphatases remove phosphates from proteins initially activated by protein kinase A. D. GTP on the alpha subunit of the G protein being hydrolyzed to GDP. E. phosphodiesterase.
The number of copies of our genome in most of our cells is ________.
A) 1 B) 2 C) 3 D) 4
Marbles is a calico cat with a Manx tail. She wants to have kittens with a male calico, but can't find one. Male calicos are rare; the only ones have the sex chromosome constitution XXY. Male calicos are therefore rare because
A) all male cats have a dominant gene on the Y chromosome that masks the calico gene on the X chromosome. B) most male cats only have one Y chromosome, so it cannot be shut off. C) most male cats have only one X chromosome, so it cannot be shut off. D) male calico cats lack sex chromosomes.
In their famous experiment, which of the following would Meselson and Stahl have observed after one cycle of replication in 14N medium if DNA replication was conservative?
A) DNA molecules containing one strand of 15N-DNA and one strand of 14N-DNA B) DNA molecules containing two 15N-DNA strands only C) DNA molecules containing two 14N-DNA strands only D) An equal number of DNA molecules containing two 15N-DNA strands and DNA molecules containing two 14N-DNA strands. E) A mix of DNA molecules corresponding to A and B.