What causes the rhythmic change in cyclin concentration in the cell cycle?
A) The cascade of increased production once the protein is phosphorylated by Cdk
B) An increase in production of a Cdk once the restriction point is passed
C) Its destruction by an enzyme phosphorylated by the cyclin-Cdk complex
D) The binding of PDGF to receptors on the cell surface
E) The changing ratio of cytoplasm to genome
C
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In which phase of mitosis do chromosomes arrive at opposite sides of the cell?
a. anaphase b. prophase c. metaphase d. telophase e. interphase
When a red blood cell is placed in a hypotonic solution, it will _____
1.swell, because water will diffuse in 2.swell, because active transport will bring water in 3.shrink, because water will diffuse out 4.shrink, because salt will flow in
What potential issue did the introduction of objects to test hypotheses of what is in the black box cause?
A. The loss of tools to test hypotheses on what is in the box. B. The need to revise old hypotheses and create new ones. C. Creating too many possible candidates for what is in the box to be solved during class. D. A potential bias towards the objects presented being what is in the box instead of the best fit judging by your observations alone.
Antioxidants are believed to:
A) generate free radicals B) cause cancer C) destroy free radicals D) break down vitamins E) break down hydrogen peroxide