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MMSC490 Exam 2 Questions and Correct Answers/ Latest Update / Already Graded
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--66december 20252025/2026A+Beschikbaar in een bundel
- During E. coli DNA replication, all newly synthesized or nascent DNA 
fragments must have one of the following characteristics 
a. a 5' hydroxyl and 3' triphosphate 
b. a 5' triphosphate and 3' monophosphate 
c. 5' monophosphate and 3' hydroxyl 
d. 5' triphosphate and 3' hydroxyl 
Ans: d. 5' triphosphate and 3' hydroxyl 
Among the 3 DNA polymerases in E. coli, DNA polymerases I and III 
differ in a number of properties that make DNA polymerase III a more 
s...
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MMSC490 Exam 2 Questions and Correct Answers/ Latest Update / Already Graded
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--47december 20252025/2026A+Beschikbaar in een bundel
- Aminoacyl tRNA synthetases are enzymes that 
connect amino acids while they are held in place on ribosomes by 
transfer RNAs. 
attach the terminal CCA sequence to transfer RNAs. 
synthesize transfer RNAs. 
attach amino acids to specific transfer RNAs. 
Ans: attach amino acids to specific transfer RNAs. 
E. coli contains about .................... different tRNAs that code for 
.................... different amino acids. 
40; 20 
50; 20 
62; 40 
62; 20 
Ans: 40; 20 
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MMSC490 Exam 1 Questions and Correct Answers/ Latest Update / Already Graded
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--65december 20252025/2026A+Beschikbaar in een bundel
- cytoplasmic organelles are: 
a. absent in prokaryotic cells and present in eukaryotic cells. 
b. present in both prokaryotic and eukaryotic cells. 
c. present in prokaryotic cells and absent in eukaryotic cells. 
d. absent in both prokaryotic and eukaryotic cells. 
Ans: a. absent in prokaryotic cells and present in eukaryotic 
cells 
E. coli is a useful model system for molecular biology studies because: 
a. it has a small genome. 
b. it reproduces rapidly. 
c. mutants can easily be is...
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MMSC490 Questions and Correct Answers/ Latest Update / Already Graded
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--23december 20252025/2026A+Beschikbaar in een bundel
- What are genes? 
 Ans: Segments of DNA that encode proteins or RNA. 
 
What is transcription? 
 Ans: The process where the nucleotide gene sequence is copied 
into RNA. 
 
What is translation? 
 Ans: The process where the nucleotide sequence of RNA is 
used to specify the order of amino acids in a protein. 
 
What are the main components of present-day biological membranes? 
 Ans: They are composed of phospholipids, which have 
hydrophobic hydrocarbon chains and hydrophilic head gro...
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