Organisms belonging to the genus Brucella are:
a. gram-positive diplococci.
b. gram-positive diphtheroid bacilli.
c. gram-negative coccobacilli.
d. gram-negative bacilli.
C
Organisms belonging to the genus Brucella are small, nonmotile, aerobic, gram-negative cocco-bacilli or short rods that stain poorly with conventional Gram stain.
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DNA consists of two antiparallel strands of nucleotides held together by
A. peptide bonds. B. covalent bonds. C. ionic bonds. D. hydrogen bonds.
An organism with a temperature growth optimum near 80°C and a pH growth optimum between two and three is usually referred to as a(n) ________.
A. thermophile B. halophile C. thermoalkalophile D. thermoacidophile
Lysosomes function best at a pH of ____
a. 7.4 b. 6.5 c. 3.2 d. 5.0 e. 8.2
The endosymbiotic hypothesis accounts for the origin of which cell structure?
A) Ribosome B) Plasma membrane C) Cell wall D) Chromosome E) Chloroplast