Which of the following characterizes blood flow through capillaries?
A) small total cross-sectional area, so blood flows rapidly
B) enormous total cross-sectional area, but wide so that blood cells pass quickly
C) enormous total cross-sectional area, but narrow so that blood cells pass slowly
D) small total cross-sectional area, so blood flows slowly
Answer: C
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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 will allow the white blood cells to cling to one another to form a migrating clot. B. 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. C. Cell adhesion molecules will allow the white blood cells to attach to the injured area so they become immobile.
A pathway for cell growth control is conserved between Drosophila and humans, indicating that the
pathway is _______.
a. also found in prokaryotes d. at least 3.8 billion years old b. also found in all animals e. at least 8 million years old c. at least 800 million years old
A disaster such as a meltdown in a nuclear power plant requires close examination of potential impacts on organisms. Which of the following would be useful to biologists in such a situation?
A) Use a molecular clock to time the divergence of species in an area from those far away. B) Measure continental drift to determine if the disaster had accelerated movement of continents. C) Use radiometric dating to determine if new species are forming. D) Examine the mutation rate of species in the area.
All Entamoeba are harmful to their hosts.
Answer the following statement true (T) or false (F)