Main TopicsWhich of the following statement regarding a DNA double helix is true?
Table of Contents
- Which of the following statement regarding a DNA double helix is true?
- What is the best description of the DNA double helix?
- Which of the following statements is true about the structure of DNA?
- What are the characteristics of a double helix?
- What is pitch of DNA helix?
- Which of the following statement is not consistent with the double helix model of DNA?
- Why is DNA in the shape of a double helix?
- Why can't you see the double helix structure of DNA?
- What are three functions of DNA?
- What is a cells DNA called?
- Which is the correct statement about the structure of DNA?
- How are new base pairs formed during DNA replication?
- How is the pairing of nitrogenous bases in DNA specific?
- How is the pitch of the double helix determined?
Which of the following statement regarding a DNA double helix is true?
Chapter 15-18
| Question | Answer |
|---|---|
| Which of the following statements regarding a DNA double helix is always true? | The amount of adenine is equal to the amount of thymine, and the amount of guanine is equal to the amount of cytosine |
| DNA replication | uses each strand of a DNA molecule as a template for the creation of a new strand |
What is the best description of the DNA double helix?
Yes - The double helix is like a twisted ladder with it sugar-phosphate backbone forming the sides of the ladder and the nitrogenous bases forming the rungs. An extension ladder with sugars facing each other as the rungs of and the phosphates and bases forming the sides of the ladder.
Which of the following statements is true about the structure of DNA?
Answer: The correct answer will be option- the nucleic acid strands in a DNA molecule are oriented antiparallel to each other, meaning they run in opposite directions. Explanation: Deoxyribose nucleic acid or DNA is the molecule which acts as the genetic material of the organisms.
What are the characteristics of a double helix?
Double Helix Double helix is the description of the structure of a DNA molecule. A DNA molecule consists of two strands that wind around each other like a twisted ladder. Each strand has a backbone made of alternating groups of sugar (deoxyribose) and phosphate groups.
What is pitch of DNA helix?
The pitch per helix turn, which corresponds to its identity period, is 3.37 nm (33.7 Å). There are ten bases per pitch in one strand. The base planes are thus spaced about 0.34 nm (3.4 Å) apart. They are perpendicular to the axis of the helix.
Which of the following statement is not consistent with the double helix model of DNA?
The density of DNA decreases on heating as hydrogen bonds breakdown. According to ChargafFs rules, the amount of adenine is always equal to that of thymine, and the amount of guanine is always equal to that of cytosine i.e A = T and G = C.
Why is DNA in the shape of a double helix?
The double helix of DNA is, like its name implies, in the shape of a helix which is essentially a three dimensional spiral. The double comes from the fact that the helix is made of two long strands of DNA that are intertwined—sort of like a twisted ladder.
Why can't you see the double helix structure of DNA?
Under a microscope, the familiar double-helix molecule of DNA can be seen. Because it is so thin, DNA cannot be seen by the naked eye unless its strands are released from the nuclei of the cells and allowed to clump together.
What are three functions of DNA?
DNA now has three distinct functions—genetics, immunological, and structural—that are widely disparate and variously dependent on the sugar phosphate backbone and the bases.
What is a cells DNA called?
In organisms called eukaryotes, DNA is found inside a special area of the cell called the nucleus. Because the cell is very small, and because organisms have many DNA molecules per cell, each DNA molecule must be tightly packaged. This packaged form of the DNA is called a chromosome.
Which is the correct statement about the structure of DNA?
Choose the incorrect statement regarding DNA structure. A Base stacking destabilise DNA double helical structure. B Each chain in DNA constitute sugar-phosphate backbone C Two chains are coiled in right handed fashion D The pitch of the helix has roughly 10 bp.
How are new base pairs formed during DNA replication?
each strand of a DNA molecule carries complementary information and can be used as a template during replication. During the replication of a DNA molecule new base pairs must be formed according to Chargaff's rule.
How is the pairing of nitrogenous bases in DNA specific?
The pairing of nitrogenous bases in DNA is specific because. functional groups on each of the bases form hydrogen bonds with functional groups on only one other base. Eukaryotic cells store their DNA in the form of linear chromosomes.
How is the pitch of the double helix determined?
Each chain in DNA constitute sugar-phosphate backbone, Two chains are coiled in right-handed fashion in case of B-DNA and the pitch of the helix has roughly 10 bp in it. However, apart from it the base stacking interactions between the nitrogenous bases of the DNA help to stabilize the double helix structure.
