What is a possible rationale for the difference between the DNA in chromatin and chromosome form? The structure of chromatin allows DNA-binding proteins to access the DNA. The loosely organized chromatin facilitates transcription. The condensed chromatin keeps the DNA organized through cell division.
What consists of DNA wrapped around proteins and is only observed when the cell is dividing or preparing to divide?
It is estimated that humans have almost 22,000 genes distributed on 46 chromosomes. Figure 3.3. 4 – DNA Macrostructure: Strands of DNA are wrapped around supporting histones. These proteins are increasingly bundled and condensed into chromatin, which is packed tightly into chromosomes when the cell is ready to divide.
What organelle is responsible for protein synthesis and membrane production?
Ribosomes, large complexes of protein and ribonucleic acid (RNA), are the cellular organelles responsible for protein synthesis.
Which membranous organelle is responsible for protein synthesis quizlet?
Ribosomes are Responsible for Protein Synthesis and are often Associated with the Endoplasmic Reticulum 3.5.
What structure in the nucleus stores the instructions for protein synthesis?
The structure in the nucleus that stores the instructions for protein synthesis is DNA.
What are the similarities of homologous chromosomes and how do they differ from each other?
The two chromosomes in a homologous pair are very similar to one another and have the same size and shape. Most importantly, they carry the same type of genetic information: that is, they have the same genes in the same locations. However, they don’t necessarily have the same versions of genes.
Is there a difference between DNA in eukaryotes and DNA in prokaryotes?
Prokaryotic genomic DNA is attached to the plasma membrane in the form of a nucleoid, in contrast to eukaryotic DNA, which is located in a nucleus. Prokaryotes contain circular DNA in addition to smaller, transferable DNA plasmids. Eukaryotic cells contain mitochondrial DNA in addition to nuclear DNA.
How does the membrane of the cell differ from the nuclear membrane?
The cell membrane is a lipid bilayer that surrounds the entire cell. It is a lipid bilayer in the form of a continuous sheet. The nuclear membrane is not a continuous sheet, but rather is made up of a series of vesicles that come together to form the envelope around the nucleus.
Why DNA and ribosomes are located at different sites?
Firstly their functions are very different. Ribosomes are present, where protein synthesis is needed. DNA is present inside the nucleus, bcz Chromosomes are in nucleus and they are inheritery materials..
What is the difference between how a molecule crosses the cell membrane in simple diffusion and in facilitated diffusion?
The difference is how the substance gets through the cell membrane. In simple diffusion, the substance passes between the phospholipids; in facilitated diffusion there are a specialized membrane channels.
How does the flow of genetic information differ in a retrovirus when compared to any other cell?
How does the flow of genetic information differ in a retrovirus when compared to any cell? In a retrovirus the flow is reversed: Instead of DNA → RNA, it’s RNA → DNA.
Which organelle makes the proteins that are needed by the cell quizlet?
Ribosomes are the protein-producing organelles of a cell. They are then transported to the cytoplasm. Proteins are necessary for the cells to perform cellular functions. Ribosomes are the cellular component that makes proteins from all amino acids.
What is the purpose of the nucleus in protein synthesis?
The nucleus directs protein synthesis by synthesizing messenger RNA (mRNA) according to instructions provided by the DNA. Once an mRNA molecule reaches the cytoplasm, ribosomes translate the mRNA’s genetic message into the primary structure of a specific polypeptide.
How does the nucleus contribute to protein synthesis?
In eukaryotes, ribosomes get their orders for protein synthesis from the nucleus, where portions of DNA (genes) are transcribed to make messenger RNAs (mRNAs). An mRNA travels to the ribosome, which uses the information it contains to build a protein with a specific amino acid sequence.
How nucleus controls protein synthesis?
The nucleus directs all cellular activities by controlling the synthesis of proteins. mRNA then leaves the nucleus through the nuclear pores. Once in the cytoplasm, mRNA attaches to ribosomes (either bound to endoplasmic reticulum or free in the cytoplasm) and initiates protein synthesis.