Carbon 14 radioisotopes decay into stable
a. carbon 13 isotopes.
b. nitrogen atoms.
c. carbon atoms.
d. nitrogen 15 isotopes.
e. sodium atoms.
B
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The major obstacle to the use of xenotransplants can possibly be overcome by ____
a. giving a series of injections that depress the immune systems of recipients b. changing genetic markers in humans to make them more receptive to nonhuman tissue c. cloning donor animals using human DNA d. introducing a complement genes to both the donor animal and recipient human e. altering the patient's MHC complex
A cell is considered _______ if two of each type of chromosome are present inside the cell.
Fill in the blank(s) with the appropriate word(s).
Which of the following does NOT provide new genetic combinations?
A) Random fertilization B) Cytokinesis C) Independent assortment D) Crossing over
If the number of bacteria during log phase growth can be calculated by the following equation: Nt = N0 x 2t/d in which Nt is the number of bacteria after time (t), t/d is the amount of time divided by the doubling time, and N0 is the initial number of bacteria, how many bacteria will be in the Culture after 2 hours if the doubling time is 20 minutes and the initial bacterial inoculum contained 1,000 bacteria?
A. 512,000 B. 64,000 C. 256,000 D. 128,000 E. 132,000