In Frederick Griffith's experiment, live R cells and dead S cells were injected into mice, causing fatal pneumonia. Neither live R cells nor dead S cells alone cause pneumonia, so Griffith concluded that _____
1.DNA is the genetic material
2.some, but not all, R cells cause pneumonia
3.DNA encoding the ability to form capsules was released from dead S cells and picked up by R cells
4.hereditary information of unknown identity transformed R cells into S cells
5.DNA controls the synthesis of specific products
4
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Rett syndrome results from
A) a microRNA that binds the wrong set of mRNA targets. B) unstable transposons. C) fetal hemoglobin that is reactivated in a child. D) abnormal methylation of a gene expressed in the brain.
What type of lipid has four carbon rings and no tails?
a. fats b. steroids c. waxes d. phospholipids e. triglycerides
Under which condition(s) might one have an amino acid substitution in a protein that does not result in an altered phenotype?
What will be an ideal response?
Water tends to move into a cell that has a(n):
A. high turgor pressure due to cell wall rigidity B. high, positive water potential C. more negative water potential than its surroundings D. low turgor pressure