Pyrimidines and purines can exist in alternate forms, or tautomers, shown here. Under common cellular conditions (physiological pH) the most common form of each purine or pyrimidine is shown on the left, and the rare tautomer on the right
Tautomers differ in the placement of hydrogen atoms and double bonds. Consider cytosine and its tautomer, the rare imino form of cytosine. With which nitrogenous base will the imino form of cytosine
most likely base pair in a double stranded DNA?
A. adenine
B. cytosine
C. guanine
D. thymine
E. uracil
A
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The _______________________ , which is part of the nervous system, is also recognized as a major endocrine organ because it produces several hormones
Fill in the blank(s) with the appropriate word(s).
Disease cases that exhibit new syndromes or characteristics or are linked to new pathogens are surveyed through regional laboratories and considered ________ cases
A) zoonotic B) index C) endemic D) epidemic
Which of the following is a symbiotic relationship that was probably present in the first terrestrial plants and is still important for the mineral nutrition of present-day angiosperms?
a. Mycorrhizae b. Lichens c. Insects pollinating flowers d. Carnivorous plants feeding on insects e. Epiphytes growing on a tree trunk
Please order the following microbes or microbial forms in terms of their resistance to control methods, beginning with those that are most resistant.
> Prions > Enveloped viruses > Mycobacterium tuberculosis > Gram-negative bacteria > Bacterial endospores