How many electrons will be found in the 2nd orbital shell of Carbon?
a. 2
b. 3
c. 4
d. 5
e. 1
c
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After mutagenesis, the nitrogen-fixing bacterium Sinorhizobium meliloti could no longer colonize Medicago truncatula plants. This inability to colonize was due to the absence of recognition by the host plant
Which of the following genes is most likely the site of the mutation in these bacteria? A) nitrogenase B) flavonoid-synthesizing enzyme C) Nod factors D) leghemoglobin E) peptidoglycans of the bacterial cell wall
DNA methylation is the only known natural modification of DNA. It affects
A. adenine bases. B. guanine bases. C. cytosine bases. D. thymine bases.
The immune system’s attack on the body’s own cells
a. is an autoimmune response. b. results in anaphylactic shock. c. is a type of acquired immune deficiency syndrome. d. is due to the inactivation of helper T cells. e. is due to an error in the production of MHC markers.
Nadia, who is 25 years old, wants to be taller because she is just 5 feet tall. Of the choices given, which would be the wisest option for Nadia?
A) Do nothing. B) Take injections of growth hormone. C) Use GHRH so she will have her own natural growth. D) Take thyroxine daily.