What is the structure of a nucleotide?
Nucleotide A nucleotide consists of a sugar molecule (either ribose in RNA or deoxyribose in DNA) attached to a phosphate group and a nitrogen-containing base. The bases used in DNA are adenine (A), cytosine (C), guanine (G), and thymine (T).
What is the structure of a nucleotide quizlet?
Nucleotides each have three parts: phosphate, sugar molecule, and one of four bases. The bases include: A, (adenine), g (guanine), t (thymine), c (cytosine). The phosphate and sugar molecule bonds form the backbone or hand rail of the DNA (staircase), but the genetic key is in the steps (of the stairs): the bases.
What describes a complete nucleotide?
Definition. A nucleotide is one of the structural components, or building blocks, of DNA and RNA. A nucleotide consists of a base (one of four chemicals: adenine, thymine, guanine, and cytosine) plus a molecule of sugar and one of phosphoric acid.
What are the 3 structures of a nucleotide?
The building blocks of DNA are nucleotides, which are made up of three parts: a deoxyribose (5-carbon sugar), a phosphate group, and a nitrogenous base (Figure 9.3). There are four types of nitrogenous bases in DNA.
Which of the following nucleotides is present in DNA?
Because there are four naturally occurring nitrogenous bases, there are four different types of DNA nucleotides: adenine (A), thymine (T), guanine (G), and cytosine (C).
Which of the following is present in nucleoside?
A nucleoside has a nitrogenous base and a 5-carbon sugar joined via a β-glycosidic linkage. nucleoside of DNA has deoxyribose sugar wheras that of RNA has ribose sugar. On the basis of different bases, there are five types of nucleoside; cytidine, uridine, adenosine, guanosine, thymidine.
In which DNA is not present?
DNA is not present in d) ribosomes. Explanation: Ribosomes are small double bead like structures that exist freely in cytoplasm and are seen embed in the Rough endoplasmic reticulum. The ribosome is called as cell’s protein factory as it is involved in synthesis of proteins required for the functioning of the body.
Is DNA present in ribosome?
Ribosomal DNA (rDNA) is a DNA sequence that codes for ribosomal RNA. Ribosomes are assemblies of proteins and rRNA molecules that translate mRNA molecules to produce proteins.
Is DNA Found in ER?
A eukaryotic cell is a cell that has its DNA in a distinct compartment from the cytoplasm of the cell due to a membrane; DNA is inside a nucleus. Nucleus – Contains DNA. Endoplasmic Reticulum – Split into smooth ER (SER) and rough ER (RER).
Is DNA present in lysosomes?
Lysosomes contain various hydrolases that can degrade proteins, lipids, nucleic acids and carbohydrates. In the present study, we show that DNA is also directly taken up by lysosomes and degraded. Like RNautophagy, this autophagic pathway, which we term “DNautophagy,” is dependent on ATP.
What is DNA structure and function?
DNA is the information molecule. It stores instructions for making other large molecules, called proteins. These instructions are stored inside each of your cells, distributed among 46 long structures called chromosomes. These chromosomes are made up of thousands of shorter segments of DNA, called genes.
How many bases are in a DNA molecule?
What is base pairs in DNA?
A base pair is two chemical bases bonded to one another forming a “rung of the DNA ladder.” The DNA molecule consists of two strands that wind around each other like a twisted ladder. Attached to each sugar is one of four bases–adenine (A), cytosine (C), guanine (G), or thymine (T).