©BRIGHTSTARS EXAM SOLUTIONS
11/16/2024 10:16 AM
CMB 352 Exam #2 Questions With Correct
Answers
If bacteriophage are labeled with radioactive sulfur and allowed to infect bacterial cells, the
infected bacterial cells prior to lysis are expected...
a) to be non-radioactive
b) to have radioactive DNA
c) to have radioactive proteins
d) to have radioactive DNA and proteins
e) to have radioactive carbohydrates - answer✔a) to be non-radioactive
Out of 800 progeny of a three point test cross there were 16 double crossover recombinant
progeny whereas 80 had been expected on the basis of no interference. The interference is...
a) 0.10
b) 0.20
c) 0.05
d) 0.50
e) 0.80 - answer✔e) 0.80
A plant of genotype CCdd is crossed to ccDD and the F1 testcrossed to ccdd. If the genes are
linked and 40 map units apart the percentage of ccdd test cross progeny will be...
a) 10
b) 20
c) 25
d) 50
1|Page
, ©BRIGHTSTARS EXAM SOLUTIONS
11/16/2024 10:16 AM
e) 75 - answer✔b) 20
In maize the genes W and D are so tightly linked that virtually no crossovers occur between
them. A dihybrid Wd/wD is test crossed to wd/wd. What phenotypic types and in what
proportion would you expect among the test cross progeny?
a) 1/4 WD, 1/4 wd, 1/4 Wd, 1/4 wD
b) 1/2 WD, 1/2 wd
c) 1/8 Wd, 1/8 wd, 3/8 Wd, 3/8 wD
d) 1/2 Wd, 1/2 wD
e) non of the above - answer✔d) 1/2 Wd, 1/2 wD
In 1982, Frederick Griffith's experiments with Streptococcus pneumoniae suggested that...
a) bacteria do not incorporate the DNA of the other bacteria
b) attenuated R (rough) bacteria easily revert to the wild type (virulent)
c) DNA was conclusively the molecule of heredity
d) heat killed bacteria could somehow "transform" live bacteria
e) all of the above - answer✔d) heat killed bacteria could somehow "transform" live bacteria
Which term best describes an individual with Klinefelter syndrome?
a) euploid
b) aneuploid
c) polyploid
d) triploid
e) monosomic - answer✔b) aneuploid
How can a deletion of a portion of a chromosome occur?
a) unequal crossing over during meiotic prophase
b) spindle failure during chromosome separation
c) recombination within an inversion loop
d) exposure to radiation
2|Page
11/16/2024 10:16 AM
CMB 352 Exam #2 Questions With Correct
Answers
If bacteriophage are labeled with radioactive sulfur and allowed to infect bacterial cells, the
infected bacterial cells prior to lysis are expected...
a) to be non-radioactive
b) to have radioactive DNA
c) to have radioactive proteins
d) to have radioactive DNA and proteins
e) to have radioactive carbohydrates - answer✔a) to be non-radioactive
Out of 800 progeny of a three point test cross there were 16 double crossover recombinant
progeny whereas 80 had been expected on the basis of no interference. The interference is...
a) 0.10
b) 0.20
c) 0.05
d) 0.50
e) 0.80 - answer✔e) 0.80
A plant of genotype CCdd is crossed to ccDD and the F1 testcrossed to ccdd. If the genes are
linked and 40 map units apart the percentage of ccdd test cross progeny will be...
a) 10
b) 20
c) 25
d) 50
1|Page
, ©BRIGHTSTARS EXAM SOLUTIONS
11/16/2024 10:16 AM
e) 75 - answer✔b) 20
In maize the genes W and D are so tightly linked that virtually no crossovers occur between
them. A dihybrid Wd/wD is test crossed to wd/wd. What phenotypic types and in what
proportion would you expect among the test cross progeny?
a) 1/4 WD, 1/4 wd, 1/4 Wd, 1/4 wD
b) 1/2 WD, 1/2 wd
c) 1/8 Wd, 1/8 wd, 3/8 Wd, 3/8 wD
d) 1/2 Wd, 1/2 wD
e) non of the above - answer✔d) 1/2 Wd, 1/2 wD
In 1982, Frederick Griffith's experiments with Streptococcus pneumoniae suggested that...
a) bacteria do not incorporate the DNA of the other bacteria
b) attenuated R (rough) bacteria easily revert to the wild type (virulent)
c) DNA was conclusively the molecule of heredity
d) heat killed bacteria could somehow "transform" live bacteria
e) all of the above - answer✔d) heat killed bacteria could somehow "transform" live bacteria
Which term best describes an individual with Klinefelter syndrome?
a) euploid
b) aneuploid
c) polyploid
d) triploid
e) monosomic - answer✔b) aneuploid
How can a deletion of a portion of a chromosome occur?
a) unequal crossing over during meiotic prophase
b) spindle failure during chromosome separation
c) recombination within an inversion loop
d) exposure to radiation
2|Page
