The phenomenon known as chemotaxis is defined as
A. the squeezing of cells through the lining of capillaries.
B. the release of prostaglandins and leukotrienes in response to microbes.
C. the movement of a cell toward or away from a chemical stimulus.
D. the coating of a pathogen by complement.
E. an increase in allergies and helminth infection.
Answer: C
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Which of the following bonds do not participate in the stabilization of double-stranded DNA as an energetically preferred structure compared with single-stranded DNA?
A. dipole-dipole interactions B. pi orbital stacking C. van der Waals interactions D. phosphodiester bonds E. hydrophobic base-stacking interactions
Most of Europe is in the ______ biome.
A. cold desert B. taiga C. temperate deciduous forest D. tundra E. tropical deciduous forest
Which of the following would not be a function of the peroxisomes?
A) break down fats in the liver B) produce bile salts in the liver C) help germinating seeds convert fatty acids into molecules that can be converted to sugars D) storage of toxic materials in the cell E) metabolism that uses oxygen and releases carbon dioxide in leaves
Each species has a typical survivorship curve. Identify the labeled curves and briefly describe the typical survival rates and when death occurs. Give examples of organisms that have this type of survivorship curve.
What will be an ideal response?