Antiparallel strands of a DNA molecule mean that:
Correct answer: D. The phosphate groups at the start of two DNA strands are in opposite positions (poles)
- A. One strand turns clockwise
- B. One strand turns anti-clockwise
- C. The phosphate groups of two DNA strands, at their ends, share the same position
- D. The phosphate groups at the start of two DNA strands are in opposite positions (poles)
Explanation
DNA is a type of nucleic acid that forms genetic material in many organisms. It consists of a long polymer of nucleotides that transcribes the coded information in the form of a triplet code of nucleotides in mRNA. It is a double helical molecule. The two strands of DNA run in opposite directions to one another with hydrogen bonds between them. One strand of DNA has a 5'-3' direction and the other strand has a 3'-5' direction, so they are antiparallel. This direction is determined by the presence of a free phosphate or OH group at the end of the strand.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Chromosomes
Chromosomes are DNA-protein structures that carry genes and become visible during cell division. Coverage includes chromatin, centromeres, sister chromatids, homologous chromosomes, chromosome number, and the distinction between diploid and haploid cells, with links to DNA replication, mitosis and meiosis.
Practise Cell Structure and Function
2,478 free Cell Structure and Function MCQs from Biology, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Biology questions like this
Biology is on 8 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Chromosomes questions
Which one of the following is not a part of a transcription unit in DNA?
Which of the following is required as an inducer(s) for the expression of Lac operon?
A molecule that can act as a genetic material must NOT fulfill which of the the traits given below?
What would happen if, in a gene encoding a polypeptide of 50 amino acids, the 25 th codon (UAU) is mutated to UAA?
Which of the following enzymes are used to join bits of DNA?
Most protein coding genes are found in?