What compound has the highest concentration in a cell?
A. H2O
B. CO2
C. NH3
D. glucose
E. CH4
Answer: A
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You treat a sample of DNA with DNase and run the digested fragments out on an electrophoretic gel. You found mostly long fragments. What can you conclude about this sample of DNA?
A) The sample contains mostly euchromatin. B) The sample contains relatively few histone proteins. C) The sample contains mostly heterochromatin. D) The DNA is from yeast cells. E) The sample likely represents actively transcribed genes.
Several experiments were required to demonstrate how traits are inherited
Which scientist or team of scientists first demonstrated that cells contain some component that can be transferred to a new population of cells and permanently cause changes in the new cells? (a) Griffith (b) Watson and Crick (c) Avery, MacLeod, and McCarty (d) Hershey and Chase
How do mitogen-activated protein kinases become inactive?
A. Ras hydrolyzes GTP to GDP. B. Ligand diffuses away from the ligandbinding site. C. Phosphatases remove phosphate groups. D. Receptor kinases move apart in the membrane.
________ are small peptide molecules (10—50 amino acids in length) that affect membrane permeability.
Fill in the blank(s) with the appropriate word(s).