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Step-by-step solution for: DNAColoringKEY-1.pdf - DNA - The Double Helix - Answer Key 1. Why ...
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Step-by-step solution for: DNAColoringKEY-1.pdf - DNA - The Double Helix - Answer Key 1. Why ...
1. What is the main objective of the "Double Helix" activity?
To understand the structure and function of DNA by building a model.
2. What does DNA stand for?
Deoxyribonucleic Acid.
3. What are the four nitrogenous bases in DNA?
Adenine (A), Thymine (T), Cytosine (C), Guanine (G).
4. Which base pairs with adenine?
Thymine (T).
5. Which base pairs with cytosine?
Guanine (G).
6. What holds the two strands of DNA together?
Hydrogen bonds between complementary base pairs.
7. What is the shape of the DNA molecule?
Double helix.
8. What sugar is found in DNA?
Deoxyribose.
9. What is the backbone of the DNA strand made of?
Alternating sugar (deoxyribose) and phosphate groups.
10. What is the role of DNA in living organisms?
Stores genetic information and directs protein synthesis.
11. How many hydrogen bonds form between A and T?
Two.
12. How many hydrogen bonds form between C and G?
Three.
13. Why is the pairing of bases specific?
Due to the size, shape, and hydrogen bonding capacity of each base.
14. What is meant by “complementary base pairing”?
Each base on one strand pairs specifically with its complement on the opposite strand (A-T, C-G).
15. What would happen if the wrong base were added during replication?
It could cause a mutation, potentially altering protein function.
16. Why is DNA described as “antiparallel”?
The two strands run in opposite directions — one 5’ to 3’, the other 3’ to 5’.
17. What is the significance of the double helix structure?
Allows for accurate replication and stable storage of genetic information.
18. How does the structure of DNA relate to its function?
The complementary base pairing enables precise copying; the double helix protects the genetic code.
19. What enzyme is responsible for unwinding the DNA double helix during replication?
Helicase.
20. What is the importance of the “rungs” in the DNA ladder?
They represent base pairs that encode genetic instructions.
21. Why is DNA called the “blueprint of life”?
It contains the instructions for building and maintaining an organism.
22. What is the difference between DNA and RNA?
DNA is double-stranded, uses deoxyribose and thymine; RNA is single-stranded, uses ribose and uracil.
23. If a DNA strand has the sequence ATCG, what is its complementary strand?
TAGC.
24. Why must DNA be replicated before cell division?
To ensure each daughter cell receives a complete set of genetic instructions.
25. What part of the DNA molecule carries the genetic code?
The sequence of nitrogenous bases.
26. What is the function of the phosphate group in DNA?
Forms part of the sugar-phosphate backbone, providing structural support and negative charge.
27. How does the specificity of base pairing contribute to genetic stability?
Ensures accurate copying of DNA during replication, minimizing errors.
28. What happens if a mutation occurs in a gene?
It may alter the amino acid sequence of a protein, potentially affecting its function.
29. Why is the double helix model important in biology?
It explains how genetic information is stored, copied, and transmitted.
30. What is the role of Chargaff’s rules in understanding DNA?
They established that A=T and C=G, which helped deduce the base-pairing structure.
To understand the structure and function of DNA by building a model.
2. What does DNA stand for?
Deoxyribonucleic Acid.
3. What are the four nitrogenous bases in DNA?
Adenine (A), Thymine (T), Cytosine (C), Guanine (G).
4. Which base pairs with adenine?
Thymine (T).
5. Which base pairs with cytosine?
Guanine (G).
6. What holds the two strands of DNA together?
Hydrogen bonds between complementary base pairs.
7. What is the shape of the DNA molecule?
Double helix.
8. What sugar is found in DNA?
Deoxyribose.
9. What is the backbone of the DNA strand made of?
Alternating sugar (deoxyribose) and phosphate groups.
10. What is the role of DNA in living organisms?
Stores genetic information and directs protein synthesis.
11. How many hydrogen bonds form between A and T?
Two.
12. How many hydrogen bonds form between C and G?
Three.
13. Why is the pairing of bases specific?
Due to the size, shape, and hydrogen bonding capacity of each base.
14. What is meant by “complementary base pairing”?
Each base on one strand pairs specifically with its complement on the opposite strand (A-T, C-G).
15. What would happen if the wrong base were added during replication?
It could cause a mutation, potentially altering protein function.
16. Why is DNA described as “antiparallel”?
The two strands run in opposite directions — one 5’ to 3’, the other 3’ to 5’.
17. What is the significance of the double helix structure?
Allows for accurate replication and stable storage of genetic information.
18. How does the structure of DNA relate to its function?
The complementary base pairing enables precise copying; the double helix protects the genetic code.
19. What enzyme is responsible for unwinding the DNA double helix during replication?
Helicase.
20. What is the importance of the “rungs” in the DNA ladder?
They represent base pairs that encode genetic instructions.
21. Why is DNA called the “blueprint of life”?
It contains the instructions for building and maintaining an organism.
22. What is the difference between DNA and RNA?
DNA is double-stranded, uses deoxyribose and thymine; RNA is single-stranded, uses ribose and uracil.
23. If a DNA strand has the sequence ATCG, what is its complementary strand?
TAGC.
24. Why must DNA be replicated before cell division?
To ensure each daughter cell receives a complete set of genetic instructions.
25. What part of the DNA molecule carries the genetic code?
The sequence of nitrogenous bases.
26. What is the function of the phosphate group in DNA?
Forms part of the sugar-phosphate backbone, providing structural support and negative charge.
27. How does the specificity of base pairing contribute to genetic stability?
Ensures accurate copying of DNA during replication, minimizing errors.
28. What happens if a mutation occurs in a gene?
It may alter the amino acid sequence of a protein, potentially affecting its function.
29. Why is the double helix model important in biology?
It explains how genetic information is stored, copied, and transmitted.
30. What is the role of Chargaff’s rules in understanding DNA?
They established that A=T and C=G, which helped deduce the base-pairing structure.
Parent Tip: Review the logic above to help your child master the concept of the blueprint of life worksheet answers.
