How do cells use the ATP cycle shown in the figure?
A) Cells use the cycle to recycle ADP and phosphate.
B) Cells use the cycle to recycle energy released by ATP hydrolysis.
C) Cells use the cycle to recycle ADP, phosphate, and the energy released by ATP hydrolysis.
D) Cells use the cycle to generate or consume water molecules as needed.
E) Cells use the cycle primarily to generate heat.
Answer: A
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ABC-type ATPases that inhibit the effectiveness of antitumor drugs by transporting the drugs out of tumor cells are known as
A) multidrug resistance (MDR) transporters. B) Na+-drug antiporters. C) the cystic fibrosis transmembrane conductance regulator (CFTR). D) porins. E) None of the above; no such transporter has been identified in eukaryotes.
G protein-linked receptors are transmembrane proteins that convert a(n) extracellular hormone signal into an
intracellular signal that affects certain cell processes. Indicate whether the statement is true or false.
A. Explain the reason why the cell requires a mechanism for identifying specific sequences of DNA
B. On average, how often would the nucleotide sequence CGATTG be expected to occur in a DNA strand 4000 bases long? Show your work and explain your answer. C. Molecular processes depend upon sequence-specific interactions of proteins with DNA. Recognition sequences can be 4, 5, 6, 7, or even 8 base pairs in length for a single protein. What might be the advantages of a short recognition sequence? What might be the advantage of a longer recognition sequence?
Unsaturated fatty acids are those containing ________ carbon-carbon double bond(s).
A. one or more B. only one C. two or more D. exactly two