Which of the following best describes scientific method?
A) A way to prove hypotheses correct
B) A systematic means of observation and reasoning
C) A method that relies on chance discoveries
D) A method that proves educated guesses
B) A systematic means of observation and reasoning
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The availability of rapid antigen detection (RAD) systems for pathogenic streptococci has eliminated the need to culture Streptococcus pyogenes
Indicate whether the statement is true or false.
Which of the following statements about deserts and the organisms that live there is true?
A) Air temperatures in cold deserts, such as those west of the Rocky Mountains, may never fall below 30 degrees C. B) Growth and reproduction occur year-round in deserts. C) Deserts typically occur at the equator. D) Desert plants typically produce very few seeds. E) Many desert animals are nocturnal.
Which of the following parasites is NOT generally microscopic in its mature form, even though microbiologists usually study them?
A) amoebae B) toxoplasmas C) helminths D) leishmanias E) cyclosporas
Antibodies are Y-shaped molecules that have two identical binding sites. Suppose that you have obtained an antibody that is specific for the extracellular domain of an RTK. When the antibody binds to the RTK, it brings together two RTK molecules
If cells containing the RTK were exposed to the antibody, would you expect the kinase to be activated, inactivated, or unaffected? Explain your reasoning.