Which of the following is a correct description of bonds between DNA nitrogenous bases?
a) 2 phosphodiester bonds between A and T and 3 hydrogen bonds between C and G
b) 3 hydrogen bonds between A and T and 2 hydrogen bonds between C and G
c) 2 hydrogen bonds between A and T and 2 phosphodiester bonds between C and G
d) 2 hydrogen bonds between A and T and 3 hydrogen bonds between C and G
e) 2 phosphodiester bonds between A and T and 3 phosphodiester bonds between C and G
Ans: d) 2 hydrogen bonds between A and T and 3 hydrogen bonds between C and G
You might also like to view...
In the mid-nineteenth century Charles Darwin and Alfred Russel Wallace observed many organisms. Based on these
observations, they arrived at an explanation, called ____, for how populations change through time.
a. creationism b. natural evolution c. natural selection d. genetics e. evolution
After childbirth, ____ in the mother
a. oxytocin stimulates the production and secretion of milk b. oxytocin stimulates the production of milk and prolactin stimulates the secretion of milk c. prolactin stimulates the production and secretion of milk d. prolactin stimulates the production of milk and oxytocin stimulates the secretion of milk e. estrogen and progesterone are directly responsible for the production and secretion of milk
The heritable disorder fragile X syndrome, a major cause of intellectual disability, is caused by
A) production of enzymes that break the phosphate backbone. B) UV light. C) X-rays. D) the presence of an extra X chromosome in the sperm or egg. E) the expansion of a region of trinucleotide repeats.
The most important aspect of agar that makes it a useful ingredient for solidifying media for bacterial culture is
A. It provides an excellent carbon and energy source for bacteria. B. Bacteria are unable to break it down so it stays solidified. C. It melts at 100oC and solidifies at temperatures below 50oC. D. It provides an excellent nitrogen source for bacteria.