During which phase of mitosis do the centromeres line up along the cell equator?
A) Anaphase B) Prophase C) Metaphase D) Telophase
C
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When the air in a testing chamber is specially mixed so that its oxygen content is 10 percent and its overall air pressure is 400 mm Hg, then is _____
A) 400 mm Hg B) 82 mm Hg C) 40 mm Hg D) 21 mm Hg E) 4 mm Hg
After performing a Gram stain of a mixed culture of Gram-positive and Gram-negative cells, you
realize that you omitted the iodine step. What would you expect to see if you observed the slide under the microscope?
a. pink Gram-positive and purple Gram-negative cells b. purple Gram-positive and pink Gram-negative cells c. pink Gram-positive and pink Gram-negative cells d. colorless Gram-positive and pink Gram-negative cells e. colorless Gram-positive and colorless Gram-negative cells
What is the role of interferons?
a. Protecting cells against viral infections b. Engulfing and digesting pathogens c. Producing inflammatory molecule d. Killing viral and cancerous cells
One of the most important branch points in the evolution of animals and their nervous systems was the appearance of
A) radial symmetry. B) bilateral symmetry. C) the spinal column. D) specialized cells for transmitting signals.