If a cell containing 20 chromosomes divides by mitosis, a total of how many daughter cells will be produced?
a. 1
b. 2
c. 3
d. 4
e. 5
Ans: b. 2
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Sigma virus infection in Drosophila melanogaster causes flies to become paralyzed and then die in high concentrations of CO2. The virus is passed on extrachromosomally
Two isogenic strains of Drosophila cultures are maintained: R (resistant to CO2 or wild type) and S (susceptible to CO2, infected with sigma). After crosses between male R and female S flies, subsets of offspring of each gender are tested for CO2 sensitivity. Which of the following results do you expect? A) All the offspring are sensitive. B) All the offspring are female. C) All the offspring are male. D) All the offspring are sensitive, but only males pass it on. E) Only male offspring backcrossed to the female parent are sensitive.
Proper cross-matching of blood type is essential for safe blood transfusion
What is the general rule for safe blood transfusion, and what are the consequences if a patient receives the incorrect blood type by accident? If a patient's blood type is unknown, what is the safest course of action?
Suppose that you performed a version of the Hershey and Chase experiment, this time using 32P-labelled viruses that insert their DNA into the DNA of the cells that they infect. Also suppose that the viral DNA is then treated as part of the cell's own DNA, and is replicated during DNA replication and passed on to daughter cells when the cell divides. You infect a population of cells with the 32P-labelled viruses, and then let the infected cells go through two generations of cell divisions. In how many cells should you find 32P-labelled DNA?
a. in none of them b. in about one-quarter of them c. in about one-half of them d. in about three-quarters of them
A mature ovary, specialized as a vessel that houses and protects seeds, is a
A) fruit. B) ovule. C) cotyledon. D) seed coat.