The development of multicellular organisms likely originated
a. from colonies of unicellular organisms of the same species.
b. from endocytosis of other cells followed by mitosis.
c. from cooperation between different species of cells.
d. from colonies of numerous species of cells.
e. from endosymbiotic eukaryotes.
A
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A patient was suspected of having a rickettsial infection after hiking in the Rocky Mountains. A Weil-Felix test was performed, which resulted in no agglutination observed. Which one of the following statements explains this discrepancy?
a. Detection of rickettsial infections using strains of Proteus is not as specific as other serologic tests; therefore the infec-tions should be retested with a newer me-thod. b. The Weil-Felix test is not the appropriate test to order; it cannot detect cross-reacting antibodies. c. Rickettsial antibodies should be tested using the fluorescent treponemal antibody absorption (FTA-ABS) test, not the Weil-Felix test. d. No discrepancy is present. Rickettsial an-tibodies do not agglutinate with Proteus antigens.
What is the genetic engineering technique being developed to cure inherited diseases in the future called?
a. gene mutation b. vaccination c. gene therapy d. plasmid therapy
Plants, algae, and certain prokaryotes are:a
photoheterotrophs b. chemoheterotrophs. c. chemoautotrophs. d. independent trophs. e. photoautotrophs.
Which of the following is a non-protein carrier found in some electron transport chains?
A) flavoproteins B) metal-containing proteins C) ribozymes D) cytochromes E) ubiquinones