When attracted to an infected area, macrophages can leave the bloodstream by squeezing through the endothelial cells lining a blood vessel. What is this process called?
A) opsonization
B) adherence
C) margination
D) diapedesis
Ans: D) diapedesis
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The observation that atmospheric CO2 levels were typically low during glacial periods in Earth's history is an example of _________________
A. causation B. correlation C. communication
You are curious about the dynamic instability of microtubules and decide to join a lab that works on microtubule polymerization
The people in the lab help you grow some microtubules in culture using conditions that allow you to watch individual microtubules under a microscope. You can see the microtubules growing and shrinking, as you expect. The professor who runs the lab gets in a new piece of equipment, a very fine laser beam that can be used to sever microtubules. She is very excited and wants to sever growing microtubules at their middle, using the laser beam. A. Do you predict that the newly exposed microtubule plus ends will grow or shrink? Explain your answer. B. What do you expect would happen to the newly exposed plus ends if you were to grow the microtubules in the presence of an analog of GTP that cannot be hydrolyzed, and you then severed the microtubules in the middle with a laser beam?
Cleavage produces the
a. zygote. b. blastula. c. gastrula. d. puff. e. third germ layer.
According to the sliding filament mechanism, during a muscle contraction, myosin pulls actin filaments toward the center of a sarcomere, causing the entire sarcomere to shorten
Indicate whether the statement is true or false