BSC 108 EXAM 3 EXAM SCRIPT LATEST
UPDATE PRACTICE TEST PAPER
QUESTIONS AND SOLUTIONS VERIFIED
GRADED A PLUS
●● What are the differences between RNA and DNA?
Answer: -RNA contains ribose rather than deoxyribose
-RNA contains base uracil (U) rather than thymine
-RNA is usually found in single-stranded form, while DNA usually
exists as a double helix
●● What is a mutation? What can cause a mutation?
Answer: -A mutation is a change in the DNA sequence caused by:
-external agents
- an error in internal processing
●● What are the four nucleotide bases for DNA and RNA?
Answer: DNA: thymine (T), cytosine (C), adenine (A), and guanine (G)
RNA: uracil (U) , cytosine (C), adenine (A), and guanine (G).
●● What is the full name for DNA? RNA?
Answer: DNA: Deoxyribonucleic Acid
, RNA: Ribonucleic Acid
●● Know where the sugar, phosphates, and nucleotides are located on
the double helix.
Answer:
●● How can a mutation be good, bad or cause no obvious difference?
Answer: Good: when it enables the organism to withstand particular
environmental stresses better than normal.
Bad: Mostly all the time. To populations and one's own health.
●● Who won the Nobel Prize for the structure of DNA?
Answer: James Watson and Francis Crick
●● What is replication?
Answer: Replication occurs in all organisms and copies DNA.
It is the basis for biological inheritance.
●● What is transcription?
Answer: The synthesis of mRNA under the direction of DNA
UPDATE PRACTICE TEST PAPER
QUESTIONS AND SOLUTIONS VERIFIED
GRADED A PLUS
●● What are the differences between RNA and DNA?
Answer: -RNA contains ribose rather than deoxyribose
-RNA contains base uracil (U) rather than thymine
-RNA is usually found in single-stranded form, while DNA usually
exists as a double helix
●● What is a mutation? What can cause a mutation?
Answer: -A mutation is a change in the DNA sequence caused by:
-external agents
- an error in internal processing
●● What are the four nucleotide bases for DNA and RNA?
Answer: DNA: thymine (T), cytosine (C), adenine (A), and guanine (G)
RNA: uracil (U) , cytosine (C), adenine (A), and guanine (G).
●● What is the full name for DNA? RNA?
Answer: DNA: Deoxyribonucleic Acid
, RNA: Ribonucleic Acid
●● Know where the sugar, phosphates, and nucleotides are located on
the double helix.
Answer:
●● How can a mutation be good, bad or cause no obvious difference?
Answer: Good: when it enables the organism to withstand particular
environmental stresses better than normal.
Bad: Mostly all the time. To populations and one's own health.
●● Who won the Nobel Prize for the structure of DNA?
Answer: James Watson and Francis Crick
●● What is replication?
Answer: Replication occurs in all organisms and copies DNA.
It is the basis for biological inheritance.
●● What is transcription?
Answer: The synthesis of mRNA under the direction of DNA
