Which of the following is an intracellular parasite of humans that usually causes a mild pneumonia?
A. Anaplasma phagocytophilium
B. Chlamydophila pneumoniae
C. Chlamydophila psittaci
D. Ehrlichia chaffeensis
E. Rickettsia typhi
Answer: B
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If multiple fragments from a genome have been cloned into bacteria, how can a researcher identify the
bacteria that contains the particular sequence they are interested in?
a. The bacteria containing the gene of interest are antibiotic resistant and unable to digest Xgal. b. The DNA purified from individual colonies of bacteria is probed with a short, single stranded DNA fragment that is complementary to the gene of interest. c. The scientists have to sequence all of the DNA from all of the white bacterial colonies; fortunately computers let us automate this process. d. The scientists have to sequence all of the DNA from all of the blue bacterial colonies; fortunately computers let us automate this process. e. We have to isolate the DNA of interest before transforming it into the bacteria. That is the only way to know which bacteria have the DNA of interest.
Enzymes _____
a. are proteins, except for a few RNAs b. lower the activiation energy of a reaction c. are changed by the reactions they catalyze d. are proteins, except for a few RNAs and lower the activation energy of a reaction
What material provides the internal, flexible support of the ear?
A) epithelial tissue B) muscle tissue C) nervous tissue D) connective tissue
Ample evidence suggests that all animals respond to their environment through instinct and simple innately programmed learning and do not display cognitive behavior.
Answer the following statement true (T) or false (F)