In his transformation experiments, which of the following results did Griffith observe?
A) Mutant mice were resistant to bacterial infections.
B) Mixing a heat-killed pathogenic strain of bacteria with a living nonpathogenic strain can convert some of the living cells into the pathogenic form.
C) Mixing a heat-killed nonpathogenic strain of bacteria with a living pathogenic strain makes
the pathogenic strain nonpathogenic.
D) Infecting mice with nonpathogenic strains of bacteria makes them resistant to pathogenic
strains.
Ans: B) Mixing a heat-killed pathogenic strain of bacteria with a living nonpathogenic strain can convert some of the living cells into the pathogenic form.
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In DNA molecules,
a. the nucleotides are arranged in a linear, unbranched pattern. b. the nitrogenous bases are found on the outside of the molecule. c. the phosphate-sugar pattern runs the same way on each DNA strand. d. the backbone is internal to the molecule. e. the pairing of bases is non-specific
A fruit-bearing dioecious flower would have
A. a gynoecium. B. both an androecium and a gynoecium. C. neither an androecium nor a gynoecium. D. an androecium.
What is an LCR and what is its role in a chromosomal domain?
What will be an ideal response?
One strand of DNA serves as a template for the synthesis of another so that __________.
A. the progeny of each cellular replication gets the same genetic information B. there are two copies of each gene on a single DNA molecule C. DNA can serve as a template for the synthesis of other polymers D. the helical shape of DNA is conserved