Which of the following is not a characteristic of vertebrates?
A. paired eyes
B. an open circulatory system
C. a well-developed cranium
D. pharyngeal slits at some point in their life
B
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How does primary protein structure affect the function of protein enzymes?
A) Substrates interact with R-groups at the enzyme's active site. B) Substrates interact with R-groups at the enzyme's external surface. C) Substrates interact with hydrophobic R-groups at any region of the enzyme. D) Substrates permanently bind to R-groups at the enzyme's active site.
Characterize the demographic transition seen in the human population. When did it occur?
What will be an ideal response?
Why is fertilization in flowering plants called
double fertilization?
a. it takes two pollen grains to fertilize a single ovule b. two ovules must be fertilized to form a single seed c. two cells in the ovule are fertilized, the egg and the endosperm mother cell d. one pollen grain fertilizes two ovules e. it takes the efforts of two flowers (male and female) to produce seeds
Although MCF-10A breast cancer cells grow well on Matrigel-coated culture dishes, the cells will form cysts of polarized cells that produce milk only when
A) extra collagen is added to the Matrigel. B) extra fibronectin is added to the Matrgel. C) extra elastin is added to the Matrigel. D) the Matrigel layer is thick enough to form a 3D environment. E) the Matrigel layer is present as a very thin layer on the culture dishes.