A chromosome
contains a single, long DNA molecule, only a portion of which corresponds to a single gene. Humans have approximately 20,000 genes arranged on their chromosomes.
Which are the components of DNA molecule?
DNA has three types of chemical component:
phosphate, a sugar called deoxyribose, and four nitrogenous bases—adenine, guanine, cytosine, and thymine
. Two of the bases, adenine and guanine, have a double-ring structure characteristic of a type of chemical called a purine.
Which of these contains a single long DNA molecule gene nucleotide chromosome Deoxyribose?
Which of these contains a single long DNA molecule gene nucleotide chromosome Deoxyribose? Answer:
A chromosome
contains a single long DNA molecule.
What two substances form the long threadlike strands of the DNA molecule?
In the nucleus of each cell, the DNA molecule is packaged into thread-like structures called
chromosomes
. Each chromosome is made up of DNA tightly coiled many times around proteins called histones that support its structure.
Are genes nucleotides?
A DNA molecule is a twisted ladder-like stack of building blocks called nucleotides. … A gene is a distinct stretch of DNA that determines something about who you are. (More on that later.) Genes vary in size, from
just a few thousand pairs of nucleotides
(or “base pairs”) to over two million base pairs.
What part of DNA is gene?
Genes are
segments of
deoxyribonucleic acid (DNA) that contain the code for a specific protein that functions in one or more types of cells in the body. Chromosomes are structures within cells that contain a person’s genes. Genes are contained in chromosomes, which are in the cell nucleus.
What is gene example?
For example, if both of your parents have green eyes, you might inherit the trait for green eyes from them. Or if your mom has freckles, you might have freckles too because you inherited the trait for freckles. Genes aren’t just found in humans —
all animals
and plants have genes, too.
What are 3 major components of A DNA molecule?
In turn, each nucleotide is itself made up of three primary components:
a nitrogen-containing region known as a nitrogenous base, a carbon-based sugar molecule called deoxyribose, and a phosphorus-containing region known as a phosphate group attached to the sugar molecule
(Figure 1).
What are the 3 types of DNA?
Three major forms of DNA are double stranded and connected by interactions between complementary base pairs. These are terms
A-form, B-form,and Z-form DNA
.
What are the 5 components of DNA?
DNA is made up of six smaller molecules — a five carbon sugar called
deoxyribose
, a phosphate molecule and four different nitrogenous bases (adenine, thymine, cytosine and guanine).
Is DNA bigger than A chromosome?
From smallest to largest: nucleotide, gene,
chromosome
, genome. Nucleotides are the smallest building blocks of DNA. … A gene is therefore composed of many pairs of nucleotides. A chromosome is a long strand of DNA which is coiled up with various proteins.
What is difference between gene and DNA?
| Gene DNA | Genes are defined as the DNA stretches. It is used to encode specific proteins. DNA is defined as a biomolecule. It consists of genetic information. |
|---|
What is difference between DNA and chromosome?
Genes are segments of deoxyribonucleic acid (DNA) that contain the code for a specific protein that functions in one or more types of cells in the body. Chromosomes are structures within cells that contain a person’s genes. Genes are contained in chromosomes, which are in the cell nucleus.
How many genes are in a chromosome?
Chromosome 1 likely contains
2,000 to 2,100 genes
that provide instructions for making proteins.
Is adenine a gene?
Adenine (A) is
one of four chemical bases in DNA
, with the other three being cytosine (C), guanine (G), and thymine (T). Within the DNA molecule, adenine bases located on one strand form chemical bonds with thymine bases on the opposite strand. The sequence of four DNA bases encodes the cell’s genetic instructions.
What is another name for nucleotides?
With all three joined, a nucleotide is also termed a “
nucleoside monophosphate”
, “nucleoside diphosphate” or “nucleoside triphosphate”, depending on how many phosphates make up the phosphate group.
