The control in an experiment
a. makes the experiment valid.
b. is an additional replicate for statistical
purposes.
c. reduces the experimental errors.
d. minimizes experimental inaccuracy.
e. allows for comparison to the experimental
group.
E
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During inspiration, intercostal muscles function to
A) flatten the diaphragm. B) pull the rib cage up and out, so that lung volume increases. C) constrict the lungs so that intrapulmonary pressure increases. D) separate the layers of pleural membranes. E) increase blood flow to lung tissue.
What is the goal of angiogenesis inhibitors?
A. They inhibit the synthesis of HER1 proteins on cancerous cells. B. They inhibit the formation of small blood vessels that feed a tumor. C. They prevent the activation of protein kinases in the cell. D. They target the Ras protein, causing it to stop promoting cell division. E. All of the choices are correct.
Extremophilic bacteria are able to survive in hostile environments, including scalding hot water as well as springs and vents that reach temperatures over 100°C
Researchers studying these bacteria measured the function of a protein from an extremophile bacterium at 100°C, and they also measured the function of a similar protein from a human cell at 100°C. Which of the following results do you think the researchers obtained? A) The bacterial protein functioned normally, whereas the human protein did not. B) The human protein functioned normally, whereas the bacterial protein did not. C) The bacterial protein and the human protein both functioned normally. D) Neither the human protein nor the bacterial protein functioned normally.
During which initial period of division in a zygote is there no increase in the overall size of the embryo?
A. Meiosis B. Fertilization C. Cleavage D. Mitosis