What is not part of a DNA molecule?
short strands of DNA are contained in chromosomes inside the nucleus of a cell. nucleotides. Which of the following is not part of a molecule of DNA? a sugar, a phosphate group, and a nitogenous base.
Which of the following is part of a DNA molecule?
The DNA molecule consists of two strands that wind around one another to form a shape known as a double helix. Each strand has a backbone made of alternating sugar (deoxyribose) and phosphate groups. Attached to each sugar is one of four bases–adenine (A), cytosine (C), guanine (G), and thymine (T).
Which of the following is not part of a DNA nucleotide?
Which of the following is not part of nucleotide structure? C is correct. The three components of a nucleotide are a 5-carbon sugar, a phosphate group, and a nitrogenous base. A nucleotide does not contain phospholipids; those are molecules that make up the cell membrane and nuclear envelope.
What are the four DNA molecules?
There are four different DNA nucleotides, each defined by a specific nitrogenous base: adenine (often abbreviated “A” in science writing), thymine (abbreviated “T”), guanine (abbreviated “G”), and cytosine (abbreviated “C”) (Figure 2).
What are the parts of a DNA?
DNA is made of chemical building blocks called nucleotides. These building blocks are made of three parts: a phosphate group, a sugar group and one of four types of nitrogen bases. To form a strand of DNA, nucleotides are linked into chains, with the phosphate and sugar groups alternating.
What is the DNA ladder called?
The shape of DNA is a double helix, which is like a twisted ladder. The sides of the ladder are made of alternating sugar and phosphate molecules.
How does DNA get its shape?
DNA is coiled into chromosomes and tightly packed in the nucleus of our cells. The twisting aspect of DNA is a result of interactions between the molecules that make up DNA and water. The fact that the two DNA strands that form the double helix are anti-parallel helps to twist the molecule as well.
Is DNA a single strand?
DNA does not usually exist as a single strand, but instead as a pair of strands that are held tightly together. The nucleotide contains both a segment of the backbone of the molecule (which holds the chain together) and a nucleobase (which interacts with the other DNA strand in the helix).
How long is a DNA?
about 3 meters
What if there was no DNA?
Without DNA, living organisms could not grow. Further, plants could not divide by mitosis, and animals could not exchange genes through meiosis. Most cells simply wouldn’t be cells without DNA.
Can you lose DNA?
In tissues composed of non- or infrequently replicating cells, DNA damage can accumulate with age and lead either to loss of cells, or, in surviving cells, loss of gene expression. Accumulated DNA damage is usually measured directly.
Why doesn’t DNA leave the nucleus?
DNA cannot leave the nucleus because that would risk it getting damaged. DNA carries the genetic code and all of the information needed for cells and…
What is DNA virus and RNA virus?
DNA viruses contain usually double‐stranded DNA (dsDNA) and rarely single‐stranded DNA (ssDNA). These viruses replicate using DNA‐dependent DNA polymerase. Compared to DNA virus genomes, which can encode up to hundreds of viral proteins, RNA viruses have smaller genomes that usually encode only a few proteins.
What are DNA virus examples?
DNA viruses comprise important pathogens such as herpesviruses, smallpox viruses, adenoviruses, and papillomaviruses, among many others.
Why is RNA virus more dangerous?
RNA viruses generally have very high mutation rates compared to DNA viruses, because viral RNA polymerases lack the proofreading ability of DNA polymerases. The genetic diversity of RNA viruses is one reason why it is difficult to make effective vaccines against them.