Biology 121 Midterm Exam UPDATED ACTUAL Exam Questions and CORRECT Answers

Biology 121 Midterm Exam UPDATED
ACTUAL Exam Questions and CORRECT
Answers
A carcinogen __________.
A. Is an agent that mutates DNA
B. Is a mutagen
C. Causes cancer
D. All of the above

E. None of the above - CORRECT ANSWER - D. All of the above


In complete dominance, a recessive allele is only expressed in the absence of the dominant allele.
A. True

B. False - CORRECT ANSWER - A. True


Identify the stage of cell cycle represented in the figure to the right.
A. Metaphase
B. Telophase
C. Anaphase

D. Prophase - CORRECT ANSWER - A. Metaphase


Cytokinesis involves the ________.
A. Division of the chromosomes at the equator
B. Build-up of the new DNA
C. Division of the centrioles
D. Division of the cytoplasmic material

E. All of the above - CORRECT ANSWER - D. Division of the cytoplasmic material

, A benign tumor fragments easily and spreads throughout the body.
A. True

B. False - CORRECT ANSWER - B. False


By convention, the dominant allele is represented by an upper-case letter while a recessive allele
is represented by a lower-case letter.
A. True

B. False - CORRECT ANSWER - A. True


During the S stage of Interphase, ____.
A. Spindle fibers form
B. DNA is replicated
C. Centromeres break down
D. The nuclear membrane breaks down and chromatin condenses into chromosomes. -
CORRECT ANSWER - B. DNA is replicated


Humans have ____ pairs of chromosomes in normal body cells.
A. 13
B. 22
C. 23

D. 46 - CORRECT ANSWER - C. 23


How many times can a messenger RNA molecule be used?
A. Once
B. Twice
C. 5-10 times

D. As many times as needed - CORRECT ANSWER - D. As many times as needed