An object in free fall undergoes an increase in
What will be an ideal response?
speed
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Why does the activity of the dynein motor proteins in an axoneme produce a "whip-like motion"?
A. The motor proteins are attached to the outer microtubule doublets. B. The motor proteins bind to an adjacent outer microtubule doublet. C. The outer microtubule doublets are all connected through cross-linking proteins. D. All of the above are correct.
Which of the following structures would be the best choice as a biological indicator to test autoclave operations?
A. Endopores formed by Geobacillus (Bacillus) stearothermophilus B. Cysts formed by Azotobacter species C. Microcysts withing the fruiting bodies of myxobacteria D. Dormant spores in the conidia of Streptomyces species
Diapedesis is the movement of white blood cells through intact blood vessel walls into surrounding body tissue. It typically happens when an area of the body is injured or damaged, and an inflammation response is required. What role would you expect cell adhesion molecules to play in this process?
A. Cell adhesion molecules help white blood cells adhere to the blood vessel wall so that they can migrate across the wall and infiltrate into the underlying tissue. B. Cell adhesion molecules will allow the white blood cells to cling to one another to form a migrating clot. C. Cell adhesion molecules will allow the white blood cells to attach to the injured area so they become immobile.
Which vertebrate group has a three-chambered heart?
A) Mammals B) Amphibians C) Lobe-finned fishes D) Ray-finned fishes E) Birds