Search results
By structure, the nucleus is dark, round, surrounded by a nuclear membrane. It is a porous membrane (like cell membrane) and forms a wall between cytoplasm and nucleus. Within the nucleus, there are tiny spherical bodies called nucleolus. It also carries an essential structure called chromosomes. Chromosomes are thin and thread-like structures ...
- Aerobic Respiration
It is the primary step of aerobic respiration is glycolysis...
- Metabolism
All the chemical reactions occurring in the living organisms...
- Endoplasmic Reticulum
Endoplasmic Reticulum is a network of membranous tubules...
- Ribosomes
Ribosomes are located inside the cytosol found in the plant...
- Acute Disease
Acute Diseases: Chronic Diseases: These diseases occur...
- Herbivore Examples
Carnivores are animals deriving their nutritional...
- Nucleus
The most integral component of the cell is the nucleus...
- Root System
Roots are the first part of a plant to grow. All vascular...
- Aerobic Respiration
Oct 30, 2024 · The single chromosome of a prokaryotic cell is not enclosed within a nuclear membrane. Among eukaryotes, the chromosomes are contained in a membrane-bound cell nucleus. The chromosomes of a eukaryotic cell consist primarily of DNA attached to a protein core. They also contain RNA. The remainder of this article pertains to eukaryotic chromosomes.
- The Editors of Encyclopaedia Britannica
- Chromosome Definition
- Function of A Chromosome
- Chromosome Structure
- Examples of Chromosome
- Related Biology Terms
- Quiz
A chromosome is a string of DNA wrapped around associated proteins that give the connected nucleic acid bases a structure. During interphase of the cell cycle, the chromosome exists in a loose structure, so proteins can be translated from the DNA and the DNA can be replicated. During mitosis and meiosis, the chromosome becomes condensed, to be orga...
The chromosome holds not only the genetic code, but many of the proteins responsible for helping express it. Its complex form and structure dictate how often genes can be translated into proteins, and which genes are translated. This process is known as gene expressionand is responsible for creating organisms. Depending on how densely packed the ch...
As seen in the graphic above, chromosomes have a very complex structure. DNA, or deoxyribonucleic acidmakes the base of the structure, as seen on the far left. DNA is made of a two strings of nucleic acid base pairs. The base pairs in DNA are cytosine, adenine, thymine, and guanine. The spiral structure formed by the two strings of DNA is due to co...
Prokaryote Replication
When a single bacteria cell has reached a large enough size, it can reproduce asexually. Although there are no membranes that separate individual organelles in bacteria, the cell will duplicate its DNA and and special chemicals it needs to survive. The DNA exists in a single chromosome, sometimes called a genophore, which is replicated by the individual strands being separated and polymerase building new, corresponding strands. The two chromosomes are separated into individual cells, and the...
Eukaryote Replication
A much more complicated view of chromosomes is present in eukaryotes. In eukaryotes, the DNA is replicated at the end of interphase, the part of the cell cycle in which the cell grows and functions. Much like in the prokaryotes, the DNA strands are separated and new strands are created by enzymes. However, in eukaryotes, there are multiple chromosomes. The new chromosomes remain connected at the centromere, a structure that allows microtubules to connect and holds chromosomes together. These...
Chromatin– DNA and its associated proteins, of which chromosomes are a part.Sister Chromatid– The still connected copies of a chromosome, which will be separated into individual chromosomes during anaphase of mitosis or anaphase II of meiosis.Homologous Chromosomes– Pairs of chromosomes from separate parents that contain the same genetic information, which are separated in anaphase I of meiosis.Sister Chromosome– One of the two new chromosomes created during DNA replication, which are now separated from each other and will soon be in different cells.1. A species has 6 homologous chromosome pairs in somatic, non-gamete cells. How many chromosomes are present in the gamete cells? How many homologous pairs? A. 6 chromosomes, 6 homologous pairs B. 12 chromosomes, 3 homologous pairs C.6 chromosomes, no homologous pairs 2. The DNA has been replicated in a cell containing 4 chromosomes. The cell is g...
The interphase nucleus is an extremely organized place. To fit all of that DNA into the nucleus in a way that allows efficient access to the required genes is no easy task. The chromatin helps with the packing and organization of the nucleus. Assembly of the histones and DNA into chromatin is very precise.
Chromosome. Chromosomes are the genetic material present in all cells. They are present in the nucleus of a eukaryotic cell. They are a thread-like structure. Each chromosome of a eukaryotic cell contains DNA and associated proteins, known as histone proteins. They are responsible for the hereditary traits and passed from parents to offspring ...
Jan 19, 2021 · What is a chromosome? 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. Chromosomes are not visible in the cell’s nucleus—not even under a microscope—when the cell ...
People also ask
What is a chromosome made up of?
Which chromosome is not enclosed in a nuclear membrane?
Where are chromosomes found in a cell?
What is a chromosome in biology?
How do chromosomes work in a cell?
Where are chromosome proteins found in a eukaryotic cell?
Eukaryotic Chromosome Structure. 1. Eukaryotic chromosomes are found in the cell’s nucleus. The principal feature that distinguishes a eukaryotic cell from a prokaryotic cell is the presence of a membrane-bound nucleus. This nucleus is the “control center” of the cell that stores all the cell’s genetic information, or DNA.
