What is the advantage to spirochetes of the corkscrew movement provided by axial filaments?
a. It provides faster movement, allowing the spirochete to escape the cells of the immune system.
b. It hides the flagella, so they are not as easily detected by the immune system.
c. It allows the cells to move more easily through viscous human tissues and fluids, such as mucus.
d. It makes spirochete cells more flexible, and prevents them from breaking as easily as bacillus-shaped bacteria.
Answer: c. It allows the cells to move more easily through viscous human tissues and fluids, such as mucus.
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The brain interprets the loudness of a sound according to _____
1.the number of signals emitted by the hair cells in the organ of Corti 2.the frequency of beats of the anvil on the round window 3.how far out the eardrum bows in response to the beating of the anvil 4.how far the cochlea uncoils
When photosynthetic pigments are extracted from the chloroplasts of green plants, they have a higher
tendency to fluoresce than pigments within intact chloroplasts. Explain this phenomenon. What will be an ideal response?
Taxonomy is the science of:
a. making new biological species. b. generating cladograms that represent evolutionary relationships between organisms. c. naming, describing, and classifying organisms. d. conserving biodiversity. e. comparing macromolecules to assess evolutionary relationships
Preservatives such as citric acid are added to foods to interfere with bacterial growth. This creates an acidic pH in the food. Why does this affect the bacteria that are present?
A) An acidic environment causes bacterial enzymes to fail or work less efficiently. B) An acidic environment increases the activation energy more quickly in bacteria. C) An acidic environment encourages endergonic reactions in the bacterial cells. D) An acidic environment causes the bacteria to grow more rapidly.