During DNA replication, nucleosomes must ____ ahead of the replication fork and ____ after DNA is replicated
a. disassemble; reassemble
b. reassemble; disassemble
c. unwind DNA; disassociate
d. synthesize primers; proofread
e. cut DNA; ligate DNA
ANSWER: a
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All of the following are true statements about life zones EXCEPT:
a. Life zones are very broad geographical regions with similar physical characteristics. b. Terrestrial life zones are typically described by the dominant type of vegetation. c. Animals typically moved readily between different life zones in a geographical area. d. Each continent is made up of many different life zones
Place the following in the correct order of the
structures blood flows through beginning with the arrival of blood at the vena cavae and ending with the blood flowing to the lungs. 1. right atrioventricular valve 2. pulmonary artery 3. right ventricle 4. right atrium 5. pulmonary valve
a. 4-3-5-2-1 b. 4-1-3-5-2 c. 4-2-3-1-2 d. 3-1-4-5-2 e. 3-2-4-5-1
________ organisms are unable to regulate their body temperature and must rely on ________ to maintain optimal membrane fluidity
Fill in the blank with correct word.
Why is a secondary immune response stronger?
A) Body cells are primed to produce antibodies against the pathogen. B) Antibodies produced during the primary response are still present circulating in the blood. C) Body cells develop resistance to the pathogen. D) Effector cells produced during the primary response are still present circulating in the blood. E) Exposure to a previously encountered antigen gives rise not only to effector cells but also to clones of long-lived memory T cells and memory B cells.