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DNA Structure and Function
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DNA Structure and Function
DNA Structure and Function
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1
Question
What does DNA stand for?
Answer
Deoxyribonucleic acid.
2
Question
What is the primary function of DNA in living organisms?
Answer
It provides a way to store and express the information for life.
3
Question
How is genetic information transferred from a parent to its offspring?
Answer
Genetic information is transferred through DNA.
4
Question
What are genes?
Answer
Genes are regions on DNA strands that contain discrete instructions for producing the molecular tools required for all living organisms, namely proteins.
5
Question
What role do proteins play in living cells?
Answer
Proteins have functional roles in just about every aspect of a living cell, including structural roles and as enzymes that regulate biochemical pathways.
6
Question
What is meant by the term 'transcription' in DNA processes?
Answer
Transcription is the process of copying stretches of DNA into a related nucleic acid RNA.
7
Question
What are the chemical building blocks of DNA?
Answer
DNA is a long polymer of simple units called nucleotides.
8
Question
What forms the backbone of a DNA molecule?
Answer
The backbone of DNA is made of sugars and phosphate atoms joined by ester bonds.
9
Question
What is a nucleotide?
Answer
A nucleotide is a molecular unit made up of a pentose sugar, a nitrogenous base, and a phosphoric acid.
10
Question
What are the four types of nitrogen bases found in DNA?
Answer
Adenine (A), Thymine (T), Guanine (G), and Cytosine (C).
11
Question
What are the two types of nitrogenous bases in DNA?
Answer
Purine bases (adenine and guanine) and pyrimidine bases (thymine and cytosine).
12
Question
What distinguishes RNA from DNA in terms of structure?
Answer
In RNA, the pentose sugar is ribose instead of deoxyribose and the base thymine is replaced by uracil.
13
Question
What is the structural feature of DNA that involves base pairing?
Answer
Adenine pairs with Thymine (A-T) and Guanine pairs with Cytosine (G-C) through hydrogen bonds.
14
Question
What kind of bond joins nucleotides together in DNA?
Answer
Nucleotides are joined together by phosphate ester bonds.
15
Question
What is a phosphodiester bond?
Answer
A phosphodiester bond links the phosphate component of one nucleotide with the sugar component of the next nucleotide.
16
Question
What are the 3' and 5' ends of a DNA molecule?
Answer
The 3' end has a free -OH group on the sugar at the Carbon known as C3', and the 5' end has a phosphoric acid group at C5'.
17
Question
What did Watson and Crick propose in 1953 about DNA structure?
Answer
They proposed a model of the structure of DNA as a double helix.
18
Question
How do the sequences of bases on two DNA strands relate to each other?
Answer
The sequence of bases on one chain determines the sequence on the other chain due to specific base pairing.
19
Question
What is the significance of Chargaff's rules in DNA structure?
Answer
It states that the ratio of adenine to thymine and guanine to cytosine are always very close to unity.
20
Question
What holds the structures together in a helical arrangement?
Answer
Bases hold the structures together.
21
Question
How are the bases represented in the helical structure?
Answer
The bases are shown as paired structures situated within the helix.
22
Question
What does the diagram illustrate regarding the helical structure?
Answer
The diagram illustrates the arrangement of atoms and phosphates on the helix structure.