Which of the followings are required for conjugation
A. a plasmid
B. a piece of Donor DNA
C. a virus
D. Pili
E. Cell-to-cell direct contact
A. A and B
B. B and C
C. A, C and E
D. A, D and E
E. B, D and E
Ans: D. A, D and E
You might also like to view...
Plasmid vectors often contain ________ genes that can be used to screen for recombinants.
A. antibiotic resistance B. insertion sequence C. metabolic activation D. promoter/operator
The intermediate-disturbance hypothesis predicts that the most species rich communities would contain
A. both r- and K-selected species. B. high rates of evapotranspiration. C. predominantly K-selected species. D. intermediate biomass. E. None of the answers is correct.
The most common isotope of carbon has an atomic number of 6 and a mass number of 12, while the
most common isotope of oxygen has an atomic number of 8 and a mass number of 16. A molecule of CO2 made up of these common isotopes has a molecular weight of ____.
a. 28 b. 44 c. 56 d. 14 e. 22
The gene responsible for Marfan syndrome encodes a protein associated with ____
a. heart muscle b. connective tissue c. fat tissue d. red blood cells e. nervous tissue