What happens to cells that are put in hypertonic solutions?
What will be an ideal response?
Crenation
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In meiosis, recombination occurs _______________
A. during prophase I and II and involves exchange of chromosome fragments between all four chromatids B. only during prophase I and involves exchange between chromatids of homologous chromosomes C. only during prophase I and involves exchange of chromosome fragments between sister chromatids D. during prophase I and II and involves exchange of chromosome fragments between sister chromatids
What is the first step of DNA replication?
a. The DNA helix unwinds. b. The DNA polymerase adds nucleotides. c. RNA primers are removed. d. DNA fragments join ligase.
Which of the following does NOT happen in cells in which both copies of the PTEN gene are inactivated?
a) The activity of the PKB molecules in the cell drops. b) The cells have excessively high levels of PIP3. c) The cells are more likely to survive a stimulus that normally leads to their destruction. d) The PKB molecules in the cell are more active than usual.
Which component of ATP synthase is the site of the proton channel?
A) F0. B) F1. C) F2. D) B subunit. E) G subunit.