The nucleophile of the first step of spliceosome-mediated pre-mRNA splicing is the:
A. 2' hydroxyl of the branch point adenosine.
B. 3' hydroxyl of a free guanine nucleotide.
C. 3' hydroxyl of the 5' splice site exon.
D. 2' hydroxyl of the 3' splice site intron.
A
You might also like to view...
Which of the following is a property of all living organisms?
a. Must “fit” their environment. b. Use the sun to fuel cellular respiration. c. Grow and develop based on inherited proteins. d. Regulate a constant internal body temperature.
Which physician is first associated with vaccination?
A) Ehrlich B) Jenner C) Lister D) Koch E) Escherich
Drug resistance occurs
A) because bacteria are normal microbiota. B) when antibiotics are used indiscriminately. C) against antibiotics and not against synthetic chemotherapeutic agents. D) when antibiotics are taken after the symptoms disappear. E) All of the answers are correct.
Pelvic inflammatory disease may result from infection with ________.
A. Mycobacterium leprae B. Clostridium perfringens C. Staphylococcus epidermidis D. Neisseria gonorrhoeae