Bio 243 Lab Final Exam 2025/2026 Exam
Questions with 100% Correct Answers |
Latest Update
What is DNA? - 🧠 ANSWER ✔✔DNA is a biomolecule which contains the
genetic blueprint for all living organisms.
What is the DNA chain made of? What are the parts? - 🧠 ANSWER ✔✔The
DNA chain is made of deoxyribonucleotides. The three parts are N-bases,
sugar, and phosphate group(s).
Name the pyrimidines. How many ring structures do they have? - 🧠
ANSWER ✔✔Thymine and Cytosine. They are single ring structures.
Name the purines. How many ring structures do they have? - 🧠 ANSWER
✔✔Adenine and Guanine. They are double ring structures.
,How many hydrogen bonds does adenine and thymine have? - 🧠 ANSWER
✔✔Two
How many hydrogen bonds does cytosine and guanine have? - 🧠 ANSWER
✔✔Three
Through which bond are the P-group and the N-base bonded to the sugar?
and on which carbon? - 🧠 ANSWER ✔✔Through covalent bonding. For the
N-base, it bonds onto the C-1' and for the P- group, it bonds onto the C-5'.
Which bond joins the two strands of DNA together? - 🧠 ANSWER
✔✔Hydrogen bonds
What does one nucleotide consist of? - 🧠 ANSWER ✔✔A sugar, one base,
and a phosphate group.
What is the phosphodiester bond? Characteristics? Direction? - 🧠
ANSWER ✔✔It is when deoxyribonucleotides get joined together through
covalent bonds. It goes from 5'-3', and you add new nucleotides to the 3'
end of the previous nucleotide present in the DNA chain. It is important for
DNA replication to start, and is catalyzed by DNA polymerases.
, What is the external structures of the DNA responsible for? - 🧠 ANSWER
✔✔DNA synthesis, gives a framework for supporting the overall structure of
the DNA molecule.
What is the internal structures of the DNA responsible for? - 🧠 ANSWER
✔✔Storage of genetic information in the N bases, central dogma.
What does the DNA polymerase do? - 🧠 ANSWER ✔✔Takes a single
nucleotide from the template strand and creates complementary
nucleotides.
How is the antiparallel nature of DNA made? - 🧠 ANSWER ✔✔It is a result
of the hydrogen bonding interactions between the nitrogen bases. It occurs
when a base has to pair itself with another base at the 3' end, which is
opposite.
What is the anti conformation of DNA? - 🧠 ANSWER ✔✔When the rotation
around the covalent bond between the nitrogen base and sugar cause the
nitrogen base to lie flat, instead of being upright.
How does DNA fit into a nucleus in eukaryotes? - 🧠 ANSWER ✔✔It wounds
itself around positively charged histone proteins and helps fold DNA into
chromatin.
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
3
Questions with 100% Correct Answers |
Latest Update
What is DNA? - 🧠 ANSWER ✔✔DNA is a biomolecule which contains the
genetic blueprint for all living organisms.
What is the DNA chain made of? What are the parts? - 🧠 ANSWER ✔✔The
DNA chain is made of deoxyribonucleotides. The three parts are N-bases,
sugar, and phosphate group(s).
Name the pyrimidines. How many ring structures do they have? - 🧠
ANSWER ✔✔Thymine and Cytosine. They are single ring structures.
Name the purines. How many ring structures do they have? - 🧠 ANSWER
✔✔Adenine and Guanine. They are double ring structures.
,How many hydrogen bonds does adenine and thymine have? - 🧠 ANSWER
✔✔Two
How many hydrogen bonds does cytosine and guanine have? - 🧠 ANSWER
✔✔Three
Through which bond are the P-group and the N-base bonded to the sugar?
and on which carbon? - 🧠 ANSWER ✔✔Through covalent bonding. For the
N-base, it bonds onto the C-1' and for the P- group, it bonds onto the C-5'.
Which bond joins the two strands of DNA together? - 🧠 ANSWER
✔✔Hydrogen bonds
What does one nucleotide consist of? - 🧠 ANSWER ✔✔A sugar, one base,
and a phosphate group.
What is the phosphodiester bond? Characteristics? Direction? - 🧠
ANSWER ✔✔It is when deoxyribonucleotides get joined together through
covalent bonds. It goes from 5'-3', and you add new nucleotides to the 3'
end of the previous nucleotide present in the DNA chain. It is important for
DNA replication to start, and is catalyzed by DNA polymerases.
, What is the external structures of the DNA responsible for? - 🧠 ANSWER
✔✔DNA synthesis, gives a framework for supporting the overall structure of
the DNA molecule.
What is the internal structures of the DNA responsible for? - 🧠 ANSWER
✔✔Storage of genetic information in the N bases, central dogma.
What does the DNA polymerase do? - 🧠 ANSWER ✔✔Takes a single
nucleotide from the template strand and creates complementary
nucleotides.
How is the antiparallel nature of DNA made? - 🧠 ANSWER ✔✔It is a result
of the hydrogen bonding interactions between the nitrogen bases. It occurs
when a base has to pair itself with another base at the 3' end, which is
opposite.
What is the anti conformation of DNA? - 🧠 ANSWER ✔✔When the rotation
around the covalent bond between the nitrogen base and sugar cause the
nitrogen base to lie flat, instead of being upright.
How does DNA fit into a nucleus in eukaryotes? - 🧠 ANSWER ✔✔It wounds
itself around positively charged histone proteins and helps fold DNA into
chromatin.
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
3
