The first antibiotic to be utilized was
A) vancomycin.
B) quinine.
C) penicillin.
D) salvarsan.
E) sulfonamides.
Ans: C) penicillin.
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Answer the following statements true (T) or false (F)
1. The covalent bonds that hold monosaccharides together in a polysaccharide are called glycosidic bonds. 2. A DNA nucleotide consists of the following three parts: a nitrogenous base, ribose, and a phosphate group. 3. The waxes in the cell walls of Mycobacterium tuberculosis cause this organism to be acid-fast. 4. The basic structure of a cell membrane is a lipid bilayer. 5. DNA polymerase is the only enzyme required for DNA replication.
Pioneering species __________
a. migrate seasonally b. tend to have fast reproductive rates c. grow slowly in disturbed areas d. migrate seasonally and tend to have fast reproductive rates
Most polymorphisms do not result in a phenotypic difference because they are typically
A) nonsense mutations. B) either missense or neutral mutations. C) either silent mutations or are in non-coding regions. D) either missense mutations or are in promoter regions.
In green plants, which photosystem absorbs photons to excite electrons in the reaction center?
A. Photosystem I, II and III B. Photosystem II C. Photosystem III D. Photosystem I E. Photosystem I and II