What is the difference between a dideoxynucleotide (ddNTP) used in sequencing and regular deoxynucleotides?
a. ddNTPs are tagged with radiolabels.
b. ddNTPs have 3 extra phosphate groups.
c. ddNTPs lack the free 3’ OH group on the five-carbon sugar.
d. ddNTPs are bound by hydrogen bonds instead of phosphodiester bonds.
c. ddNTPs lack the free 3’ OH group on the five-carbon sugar.
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Enhancement of a response to a stimulus by first presenting a strong or novel stimulus is called____
Fill in the blank with the appropriate word.
What is most likely to occur when an individual is exposed to UV radiation?
A. The melanocytes will produce melanin, the melanin is distributed into epidermal cells, a steroid is converted into vitamin D and stem cells can mutate leading to cancer. B. The melanin will produce melanocytes, the melanocytes are then distributed into epidermal cells, a steroid is converted into vitamin D and stem cells can mutate leading to cancer. C. The melanocytes will produce melanin, the melanin is distributed into epidermal cells, vitamin D is converted into a steroid and stem cells can mutate leading to cancer. D. The melanocytes will produce melanin, the melanin is distributed into dermal cells, a steroid is converted into vitamin D and stem cells can mutate leading to cancer.
Although often single celled, protists are clearly different from bacteria because _____.
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Polyomaviruses
A. cause common asymptomatic to mild infections. B. include the JC virus and BK virus. C. cause progressive multifocal leukoencephalopathy. D. cause problems in renal transplant patients. E. All of the choices are correct.