Determine which of the following statements would be inaccurate regarding the discovery of the DNA molecule?
a. In essence, she is thought of today as a co-discoverer of the molecule.
b. She died without knowing her prominent role in the DNA discovery.
c. The Nobel Prize was given to Rosalind Franklin posthumously.
d. Watson and Crick relied on her data on imaging the molecule.
Complementary base pairing links
a. nitrogen containing bases
b. phosphate groups
c. proteins
d. amino acids
The process of transformation in bacteria involves
a. infection with a virus called bacteriophage
b. transfer of genes for making a mucous capsule
c. production of a cancer cell
d. the mating of two different kinds of live bacteria
Nucleic acid contains
a. iron.
b. potassium.
c. manganese.
d. sulfur.
e. phosphorus.
The significance of Fred Griffith's experiment in which he used two strains of Streptococcus pneumoniae is that
a. all of the answers.
b. it established that pure DNA extracted from disease-causing bacteria transformed harmless strains into killer strains.
c. it demonstrated that radioactively labeled bacteriophages transfer their DNA but not their protein coats to their host bacteria.
d. it demonstrated that harmless cells had become permanently transformed through a change in the bacterial hereditary system
e. the semiconservative nature of DNA replication was finally demonstrated.
Starting with 15N15N (heavy) DNA, and after ONE generation in the 14N medium, E. coli cells subjected to density-gradient centrifugation will produce a single band of DNA with medium density.
a. False
b. True
The two strands of a DNA molecule are held together by
a. covalent bonds
b. peptide bonds
c. ionic bonds
d. hydrogen bonds
Which statement is NOT true about Fred Griffith's experiments?
a. Mice injected with heat-killed S bacteria and live R bacteria die.
b. Mice injected with R bacteria live.
c. Mice injected with S bacteria die.
d. S bacteria are transformed into harmless R bacteria.
e. Mice injected with heat-killed S bacteria die.
DNA was discarded as a possible candidate for the genetic material because
a. is had been shown that proteins were more important in transferring genetic information than nucleic acids
b. it was thought that RNA was more likely to be the genetic material
c. with only four types of nucleotides, it was a very simple, repetitive molecule that could not account for 20 different amino acids
d. proteins and carbohydrates were of more interest
DNA was proven to be the transforming substance when only the _____ enzymes could inhibit transformation.
a. proteinase
b. lipase
c. DNase
d. RNase
The amount of adenine is always equal to the amount of ____ in DNA.
a. guanine
b. ATP
c. thymine
d. uracil
e. cytosine
DNA was first proven to be the transforming factor on bacterial cells by
a. Avery
b. Watson and Crick
c. Griffin
d. McClintock
e. Meischer