You are asked to culture an unidentified sample of animal tissue. You notice that the cells seem to fail to exhibit density-dependent inhibition. The source of this tissue sample is most likely
A) a cancerous tumor.
B) skin from a human.
C) liver from a cow.
D) sperm-producing tissue of the testis.
Answer: A
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As levels of body fat increase, leptin levels __________ and appetite is __________
a. increase; suppressed b. increase; stimulated c. decrease; stimulated d. decrease; suppressed
Four of the five outcomes listed below result when a
cell is placed in a hypertonic solution. Select the exception. a. wilting b. plasmolysis c. turgidity d. limpness e. shriveling
An agent that can cause disease is a(n)
a. infectivore. b. protozoan. c. disruptor. d. pathogen. e. antibody..
A scientist is trying to coax stem cells to differentiate into muscle to use as a therapy for muscular dystrophy. He looks at his Petri dish and is excited to see the cells contracting! The cells appear striated and multinucleate. What type of muscle are they?
A. cardiac muscle B. involuntary muscle C. smooth muscle D. skeletal muscle