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AP Biology MCQ
Biological Macromolecules
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Most Probable Number (MPN) Test
Neuroscience MCQ
91
Exploring the molecular pathways and physiological importance of carbon, nitrogen, and phosphorus in dierent biological systems has highlighted their contributions to life’s fundamental processes. Carbon forms the framework of biological molecules, nitrogen is critical for proteins and nucleic acids, and phosphorus is essential for nucleic acids, membrane structure, and energy metabolism. Cellular membranes contain phospholipids which provide structure and specic physiological characteristics to support the molecular pathways of the cell. Which of the following models represents the correct arrangement of phosphorus within a phospholipid?
A:
A
B:
B
C:
C
D:
D
92
Water molecules are composed of the atoms hydrogen and oxygen, which are held together by covalent and hydrogen bonds. Which of the following models best demonstrates the arrangement of hydrogen bonds between water molecules? (Hydrogen bonds are depicted by dashed lines.)
A:
A
B:
B
C:
C
D:
D
93
What is the name of the short segments of DNA synthesized on the lagging strand?
A:
Okazaki fragments
B:
Leading fragments
C:
Replication bubbles
D:
Primer fragments
94
What is the function of topoisomerase during DNA replication?
A:
Adds nucleotides to the growing strand
B:
Relieves the strain caused by unwinding DNA
C:
Synthesizes RNA primers
D:
Joins Okazaki fragments
95
During which phase of the cell cycle does DNA replication occur?
A:
G1 phase
B:
G2 phase
C:
S phase
D:
M phase
96
What is the purpose of the RNA primer in DNA replication?
A:
To bind to the leading strand
B:
To provide a 3' OH group for DNA polymerase
C:
To unwind the DNA helix
D:
To remove nucleotides from the lagging strand
97
Which strand is synthesized discontinuously during DNA replication?
A:
Leading strand
B:
Lagging strand
C:
Both strands simultaneously
D:
Both strands continuously
98
What is the function of ligase in DNA replication?
A:
Unwinds the DNA
B:
Adds nucleotides to the growing strand
C:
Joins Okazaki fragments
D:
Synthesizes RNA primers
99
What is the role of primase in DNA replication?
A:
Unwinds the DNA
B:
Synthesizes the RNA primer
C:
Adds nucleotides to the new strand
D:
Removes RNA primers
100
In which direction does DNA replication occur?
A:
5' to 3'
B:
3' to 5'
C:
Both directions simultaneously
D:
3' to 3'
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