Often students are surprised after performing this exercise at the fact that the bacterial pellet was quite small, and yet they were able to see the DNA without the aid of magnification. Which of the following choices provides a good explanation as to why the amount of DNA may seem large?
A) In this procedure the DNA is replicated
B) While in cells DNA is extremely compact within the double helix (supercoiled), the DNA isolated in this protocol is no longer compact
C) DNA swells after it has been extracted from bacterial cells
B) While in cells DNA is extremely compact within the double helix (supercoiled), the DNA isolated in this protocol is no longer compact
You might also like to view...
The percentage of different colored water boatmen eaten by fish were graphed relative to the frequency of that color in the population. Based on the graph, a population of water boatmen would _____
A. increase in rare genotypes.
B. have no variation in genotype frequencies.
C. lose rare genotypes.
D. increase in size.
E. decrease in genetic variability.
In plants and algae, __________ is the source of the electrons needed for photosynthesis
A. O2 B. CO2 C. H2O D. NADPH E. H+
Which term refers to a normal gene that when mutated causes a cell to become cancerous?
a. Proto-oncogene b. Carcinogen c. Suppressor gene d. Diploid germ cell
What is the structural and contractile unit of a skeletal muscle called?
Myofilament Myofibril Sarcoplasmic reticulum Sarcomere