Animal cells have "counters" that keep track of how many times a cell has divided. These counters are called:
A) centromeres.
B) odometers.
C) telomeres.
D) nuclei.
E)chromosomes.
C) telomeres.
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Chancroid is the sexually transmitted disease caused by:
a. H. influenzae. b. Haemophilus ducreyi. c. H. aphrophilus. d. Haemophilus parainfluenzae.
Which of the following best describes how enzymes function?
a. by slowing the rate of some reactions and increasing the rate of other reactions b. by increasing the rate of a reaction c. by adding additional reactants to the system d. by changing the ?G of the reaction
Speciation, or the formation of new species, is
A) a form of microevolution. B) responsible for the diversity of life. C) necessary for natural selection and adaptation. D) an event that has occurred only a few times in the history of the planet.
Which one of the following statements about the trypanosome causing African sleeping sickness does not explain why the disease has been difficult to control?
A. Trypanosomes have many variable antigen genes. B. Rearrangement of antigen genes takes place during the asexual cycle. C. Only one gene determining the antigenic nature of the glycoprotein coat is expressed at a time. D. By infesting the red blood cells, trypanosomes can "hide" from the immune system. E. Trypanosomes have a protective glycoprotein coat.