General Biology 1. Unit 4 Exam
Question and answers already passed
2025/2026
All chromosomes are made of the same material - correct answer ✔DNA twisted into a double helix
what are the building blocks of DNA called? - correct answer ✔nucleotides
What are the 3 components of a nucleotide? - correct answer ✔five carbon sugar (a pentose), a
nitrogen containing (nitrogenous) base, and one of the 3 phosphate groups.
what does the overall structure of a double-stranded DNA molecule look like? - correct answer ✔A
twisted ladder (double helix)
What makes up the backbone of a double-stranded DNA molecule? - correct answer ✔Two linear sugar
phosphates
what projects away from the backbone to form structures similar to rungs on a ladder? - correct answer
✔A sugar, A phosphate, and a base
what are the two strands that make up one DNA molecule oriented? - correct answer ✔The two
strands of the helix run in opposite directions, so that the 5' carbon end of one strand faces the 3'
carbon end of its matching strand
Be able to identify the 3' and 5' ends of a DNA molecule based only on the chemical structures of
nucleotides making up the strand. - correct answer ✔5' end of DNA or RNA has a free phosphate group
attached to the 5' carbon. 3' end of DNA or RNA has a free hydroxyl group attached to the 3' carbon.
Question and answers already passed
2025/2026
All chromosomes are made of the same material - correct answer ✔DNA twisted into a double helix
what are the building blocks of DNA called? - correct answer ✔nucleotides
What are the 3 components of a nucleotide? - correct answer ✔five carbon sugar (a pentose), a
nitrogen containing (nitrogenous) base, and one of the 3 phosphate groups.
what does the overall structure of a double-stranded DNA molecule look like? - correct answer ✔A
twisted ladder (double helix)
What makes up the backbone of a double-stranded DNA molecule? - correct answer ✔Two linear sugar
phosphates
what projects away from the backbone to form structures similar to rungs on a ladder? - correct answer
✔A sugar, A phosphate, and a base
what are the two strands that make up one DNA molecule oriented? - correct answer ✔The two
strands of the helix run in opposite directions, so that the 5' carbon end of one strand faces the 3'
carbon end of its matching strand
Be able to identify the 3' and 5' ends of a DNA molecule based only on the chemical structures of
nucleotides making up the strand. - correct answer ✔5' end of DNA or RNA has a free phosphate group
attached to the 5' carbon. 3' end of DNA or RNA has a free hydroxyl group attached to the 3' carbon.
