A linear strand of DNA is 1,000 bp long. A recognition sequence for the restriction enzyme Eco R1 is located 300 base pairs (bp) from the 5' end of this linear DNA molecule. Digesting this DNA molecule with Eco RI would produce ________
A) one DNA fragment, 1,000 bp long
B) three DNA fragments, two of them 300 bp long and one 400 bp long
C) two DNA fragments, one 300 bp long and one 700 bp long
D) two fragments, each 500 bp long
E) none of the above
C
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Diatoms can best be described as ____
a. unicellular and autotrophic b. unicellular and heterotrophic c. multicellular and autotrophic d. multicellular and heterotrophic e. multicellular and parasitic
Gardasil ____
a. is a vaccine against two types of human papillomavirus (HPV) b. is most effective in women beyond child bearing age c. contains live viruses d. prevents cervical cancer shown to be caused by HPV infection e. causes warts on the hands and feet
For a normal, healthy individual, what percentage of whole blood is plasma?
a. 25 percent b. 40 percent c. 45 percent d. 55 percent e. 60 percent
As red blood cell components are recycled, the heme group is converted by the liver to ____
a. bilirubin b. bile c. iron d. proteins e. amino acids