What is the relationship between DNA and chromatin?
A) A chromatin is a unit of DNA whose sequence encodes a protein.
B) Chromatin is the combination of DNA packaged around proteins.
C) A chromatin is a DNA molecule that is separated during mitosis.
D) Chromatin is the collection of proteins encoded by DNA.
Answer: B
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Degenerative joint disease (DJD) commonly affects the knee joints because ___________
Fill in the blank(s) with the appropriate word(s).
During muscle contractions
a. the myofibrils lengthen. b. the actin and myosin filaments slide over each other. c. the actin filaments move away from the middle of the sarcomere during contraction and toward on relaxation. d. the muscle thins. e. ATP is produced.
Which of the three parts of a nucleotide (nitrogen base, phosphate, sugar) lies between the other two?
____________________ Fill in the blank(s) with the appropriate word(s).
Recall that light can be emitted from an atom when the atom loses energy. Which of the following processes is responsible for this production of light?
a. An electron moves closer to the nucleus of the atom. b. An electron moves farther away from the nucleus of the atom. c. An electron orbits the atom. d. A proton is released from the nucleus of the atom. e. The proton comes into close contact with a neutron of another atom.