Scientists have found that extracellular matrix components may induce specific gene expression in embryonic tissues such as the liver and testes. For this to happen there must be direct communication between the extracellular matrix
and the developing cells. Which kind of transmembrane protein would most likely be involved in this kind of induction?
A) integrins
B) collagens
C) actins
D) fibronectins
Answer: A
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What structure is not divided during cytokinesis?
A. endoplasmic reticulum B. chromosome C. cytoplasm D. cell membrane E. cell wall
An airfoil provides lift because air moving over a wing must travel
A) a greater distance than air moving under the wing, creating a lower pressure system above the wing. B) a greater distance than air moving under the wing, creating a higher pressure system above the wing. C) a lesser distance than air moving under the wing, creating a lower pressure system above the wing. D) a lesser distance than air moving under the wing, creating a higher pressure system above the wing.
Which of the following is the name of the heavy chain constant domain of an antibody?
A) beta B) delta C) zeta D) rho
We can conclude that natural selection must have acted in favor of large brains in humans because:
A. we have large brains in proportion to our body size compared to other mammals. B. large brains have allowed us to dominate the planet. C. large brains are metabolically expensive to produce and maintain. D. we would not have large brains if natural selection did not favor them. E. None of the answer options are correct.