Avery, MacLeod, and McCarty (1944) demonstrated that DNA was the molecule of heredity by treating heat-killed Streptococcus pneumoniae S (smooth) strain with DNase, thereby preventing transfer of the "transforming substance" from the killed S strain to the live R (rough) strain when the two were mixed together and injected into mice. Another way that one could demonstrate transformation in
bacteria would be to extract DNA from
A) an R strain and mix with cells of an S strain.
B) both S and R strains and mix to allow recombination to take place.
C) an ampicillin-sensitive strain and mix with cells of an ampicillin-resistant strain.
D) an S strain and mix with cells of an R strain.
E) none of the above
D) an S strain and mix with cells of an R strain.
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What will be an ideal response?
In some forms of breast cancer, estrogen is a(n)
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Diagnosis of the leishmaniasis is based on finding the parasite within infected ________.
A. eosinophils B. lymphocytes C. macrophages D. mast cells
A typical body cell with 23 pairs of chromosomes is called a ________.
A. gamete B. sister cell C. somatic cell D. haploid cell