A double-stranded DNA strand contains 26 pyrimidines. How many purines will the copied strand contain?
A. 52
B. 26
C. 13
D. 0
Answer: B
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Scientists want to determine whether chemical X, a component of fertilizer, is harmful to fish. They treat fish in the
laboratory with increasing amounts of the chemical for one week and then measure their viability. Fish that are not treated with chemical X are considered ____.
a. experimental data b. controls c. replicates d. experimental variables e. the null hypothesis
In contrast to a G protein-linked receptor and an enzyme-linked receptor, a channel-linked receptor:a
is located on the cell surface. b. is composed of seven alpha helices. c. couples signaling molecules to signal transduction pathways. d. is a ligand-gated channel. e. functions as a tyrosine kinase.
Which of the following is used to treat candidiasis of the skin or mucous membranes?
A) penicillin B) sulfonamide C) trifluridine D) miconazole E) acyclovir
Negative staining with India ink can be used to reveal the presence of capsules that surround bacterial cells.
Answer the following statement true (T) or false (F)