The pRB protein associated with retinoblastoma, if normal and present,
A. prevents the cell from moving from G1 to S.
B. causes the cell to move from G1 to S.
C. prevents the cell from moving from G2 to M.
D. causes the cell to move from G2 to M.
E. causes the cell to move from S to G2.
A
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Which of the following is most likely true of a protein that cotransports glucose and sodium ions into the intestinal cells of an animal?
A) Sodium and glucose compete for the same binding site in the cotransporter. B) Glucose entering the cell down its concentration gradient provides energy for uptake of sodium ions against the electrochemical gradient. C) Sodium ions can move down their electrochemical gradient through the cotransporter whether or not glucose is present outside the cell. D) The cotransporter can also transport potassium ions. E) A substance that blocks sodium ions from binding to the cotransport protein will also block the transport of glucose.
Transcription and translation can be coupled in bacteria but not eukaryotes because
A) no nuclear membrane exists in prokaryotes. B) no nuclear membrane exists in eukaryotes. C) the bacterial DNA is in a single chromosome. D) eukaryotic chromosomes are found in nucleoids.
The three most important nutrients contained in fertilizers are ________
A) nitrogen, iron, and phosphorus B) zinc, sulfur, and phosphorus C) nitrogen, phosphorus, and potassium D) zinc, iron, and potassium
Imagine that you are performing a cross involving seed texture in garden pea plants. You cross true-breeding round and wrinkled parents to obtain F1 offspring. Which of the following experimental results in terms of numbers of plants are closest to what you expect in the F2 progeny?
a) 810 round seeds b) 810 wrinkled seeds c) 405:395 round seeds:wrinkled seeds d) 610:190 round seeds:wrinkled seeds