The zone of inhibition that is formed during the disc diffusion susceptibility test is dependent on many factors. Which of the following choices is not one of the factors discussed that the zone of inhibition is dependent on?
A) The molecular weight of the antimicrobic.
B) The pH of the antimicrobic.
C) The type of media.
D) The concentration of the bacterial culture.
B) The pH of the antimicrobic.
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The master gene for male sex determination is located on _____
a. both X chromosomes b. each autosome c. the Y chromosome d. the X chromosome e. both X and Y chromosomes
Answer the following statements true (T) or false (F)
1.BMI stands for body mass index. 2.The solid waste that leaves the digestive tract of a vertebrate is called chyme. 3.The process by which a cell engulfs particulate matter is phagocytosis. 4.In herbivores, the cecum is small because the food they ingest is easily digested. 5.Symbiotic bacteria in the large intestine help prevent infection by pathogenic bacteria.
All of the following characteristics are necessary for a structure to be classified as a primitive cell except
A. a boundary separating the cell from its watery surroundings. B. DNA. C. an ability to obtain energy from its surroundings. D. macromolecules.
Which of the following is TRUE concerning the structure and function of enzymes?
A) All enzymes bind cofactors necessary for their function. B) An apoenzyme is a combination of a cofactor bound to a holoenzyme. C) Enzymes can function at a wide range of pH. D) Competitive inhibition of an enzyme occurs when an inhibitor binds to an allosteric site on the enzyme. E) After an enzyme has catalyzed a reaction, it resumes its original shape and can interact with a new substrate molecule.