RNA differs from DNA in all of the following ways except
A) RNA has directionality.
B) there are several different types of RNA including mRNA, tRNA, and rRNA.
C) in RNA, uracil (U) replaces thymine (T).
D) RNA is single stranded.
E) RNA has a hydroxyl group on the 2' carbon.
Answer: A
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Water is the least dense when it ________.
A. is frozen B. is just below boiling C. is at room temperature D. is just above freezing
Which of the following cells are involved in cell-mediated immunity and also respond to class I MHC molecule-antigen complexes?
A) cytotoxic T cells B) natural killer cells C) helper T cells D) macrophages E) B cells
How do fossils provide evidence of evolutionary history?
A. Fossils provide an accurate account of the number of species that exist at any particular time. B. Older fossils are an excellent source of DNA from which we can construct molecular phylogenies. C. Fossils provide a record of extinct species. D. Fossils provide complete information on extinct species.
The relationship between the per capita rate of consumption and the number of prey is known as the predator's ________ response
Fill in the blank(s) with correct word