What is meant the description \"antiparallel\" regarding the strands that make u

Question

What is meant the description "antiparallel" regarding the strands that make up DNA? A) The twisting nature DNA creates nonparallel strands. B) The 5' to 3' direction of the other strand runs counter to the 5' to 3' direction of the other strand. C) Base pairings create unequal spacing between the two DNA strands D) One strand is positively charged and the other is negatively charged. E)One strand contains only purines and the other contains only Which enzyme catalyzes the elongation of a DNA strand in the 5' rightarrow 3' direction? A) primase B) DNA ligase C) DNA polymerase D) topoisomerase E) helicase Of the following human aneuploidies, which is the one that generally has the most severe impact on the health of the individual? A) 47, +21 B) 47, XXY C) 47, XXX D) 47, XYY E) 45, x What is the role of DNA ligase in the elongation of the lagging strand during DNA replication? A) It synthesizes RNA nucleotide to make a primer. B) It catalyzes the lengthening of telomeres. C) It joins Okazaki fragments together. D) lt unwinds the parental double helix. E) It stabilizes the unwound parental DNA. A new DNA strand elongates only in the 5' to 3' direction because A) DNA polymerase begins adding nucleotides at the 5' end of the template. B) okazaki fragments prevent elongation in the 3' to 5' direction. C) the polarity of the DNA molecule prevents addition of nucleotides at the 3' end. D) replication must progress toward the replication fork. E) DNA polymerase can only add to the free 3' end. Why do histones bind tightly to DNA? A) Histones are positively charged, and DNA is negatively charged. B) Histones are negatively charged, and DNA is positively charged. C) Both histones and DNA are strongly hydrophobic. D) Histones are covalently linked to the DNA. E) Histones are highly hydrophobic, and DNA is hydrophilic. Which of the following nucleotide triplets best represents a codon? A) a triplet separated spatially from other triplets B) a triplet that has no corresponding amino acid C) a triplet at the opposite end of tRNA from the attachment site of the amino acid D) a triplet in the same reading frame as an upstream AUG E) a sequence in tRNA at the 3' end A part of the promoter, called the TATA box, is said to be highly conserved in evolution. Which of the following might this illustrate? A) The sequence evolves very rapidly. B) The sequence does not mutate. C) Any mutation in the sequence is selected against. D) The sequence is found in many but not all promoters. E) The sequence is transcribed at the start of every gene.

Explanation / Answer

32. Answer: - Option (B) is correct

The 5' to 3' direction of one strand runs counter to the 5' to 3' direction of the other strand.

DNA strands orientation expressed using the term of antiparallel when two opposite strands runs parallel to each other. These opposite strands will be complementary to each other.    

33. Answer: - Option (C) is correct

DNA polymerase III

DNA Polymerase III enzyme functions in direction from 5’-3’ end.

34. Answer: - Option (A) is correct

47, +21

It represents the Down syndrome which shows the abnormal number chromosomes.

35. Answer: - Option (C) is correct

It joins the Okazaki fragments together. These are the short fragments of DNA joined with the help of DNA ligase. This fragment synthesized on the strand of 3’-5’ direction. Break down in linear sequence occur because of non hydroxyl group.

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