I am a ribonucleoprotein; I contain both a polypeptide and an RNA molecule. My RNA binds to unique sequences on a DNA molecule, targeting them for cleavage by my polypeptide. I occur naturally in microbes to protect against viral attack, and I can be engineered in the lab for precision DNA editing. What am I?
A. Cas9 nuclease
B. EcoR1 restriction enzyme
C. 3' oligonucleotide
D. RNA polymerase
Answer: A
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Dialysis is a procedure in which a machine takes over the function of the
A. liver. B. pancreas. C. hypothalamus. D. urinary bladder. E. kidney.
The __________ gland produces hormones and is the
site where __________ (a kind of white blood cell) mature. Fill in the blank(s) with the appropriate word(s).
If a cell becomes arrested within the cell cycle because it is unable to replicate its DNA, which of the stages would you predict it would become arrested in?
a. Mitotic phase b. Gap 2 phase c. DNA synthesis phase d. Gap 1 phase e. None of the above; the cell would simply die.
Compared to conventional agriculture, organic farming
A) uses fewer synthetic pesticides. B) increases crop yields. C) guarantees the safety and extra health benefits of food. D) requires much less hands-on work.