Table of Contents
- 1 What can happen if a nitrogenous base is lost in the DNA sequence?
- 2 What happens to the function of a protein if the sequence of DNA bases is altered?
- 3 What will happen if there are changes in the DNA sequence that affects the genetic information?
- 4 What affect would a mutation in a cell’s DNA have on protein synthesis?
- 5 What is the relationship between a protein the cell and DNA?
- 6 How are the nitrogen bases connected to the DNA backbone and how are they connected to each other?
- 7 How do mutations in DNA affect protein synthesis?
- 8 How does a base substitution affect a protein?
What can happen if a nitrogenous base is lost in the DNA sequence?
If one or two bases are deleted the translational frame is altered resulting in a garbled message and nonfunctional product. A deletion of three or more bases leave the reading frame intact. A deletion of one or more codons results in a protein missing one or more amino acids.
What happens to the function of a protein if the sequence of DNA bases is altered?
The outcome of a frameshift mutation is complete alteration of the amino acid sequence of a protein. This alteration occurs during translation because ribosomes read the mRNA strand in terms of codons, or groups of three nucleotides. Each word itself has a separate meaning, as each codons represents one amino acid.
Why are nitrogenous bases so important to the structure of DNA?
A set of five nitrogenous bases is used in the construction of nucleotides, which in turn build up the nucleic acids like DNA and RNA. These bases are crucially important because the sequencing of them in DNA and RNA is the way information is stored.
How the structure of DNA affects the function of DNA?
DNA winds into a double helix, with hydrogen bonding between the bases of each strand like the rungs of a ladder. This structure enables DNA to coil so that the long molecule is compact and lots of information can be stored in a small space.
What will happen if there are changes in the DNA sequence that affects the genetic information?
A mutation is a change in the DNA sequence of a gene. Though some mutations are harmful, most are not. A mutation may change a trait in a way that may even be helpful, such as enabling an organism to better adapt to its environment. The simplest mutation is a point mutation.
What affect would a mutation in a cell’s DNA have on protein synthesis?
Sometimes, gene variants (also known as mutations) prevent one or more proteins from working properly. By changing a gene’s instructions for making a protein, a variant can cause a protein to malfunction or to not be produced at all.
What causes a protein to denature what happens to a protein if it is denatured?
If a protein loses its shape, it ceases to perform that function. The process that causes a protein to lose its shape is known as denaturation. Denaturation is usually caused by external stress on the protein, such as solvents, inorganic salts, exposure to acids or bases, and by heat.
What might happen if protein synthesis is malfunctioning in the human body?
Errors in protein synthesis disrupt cellular fitness, cause disease phenotypes, and shape gene and genome evolution.
What is the relationship between a protein the cell and DNA?
The relationship between DNA and protein is that DNA has the code, or instructions, for making protein. DNA is the genetic material of the cell.
How are the nitrogen bases connected to the DNA backbone and how are they connected to each other?
The chemical bases are connected to each other by hydrogen bonds, but the bases can only connect to a specific base partner – adenine and thymine connect to each other and cytosine and guanine connect to each other.
What is the role of proteins associated with the DNA molecule that makes up the gene?
DNA contains the instructions needed for an organism to develop, survive and reproduce. To carry out these functions, DNA sequences must be converted into messages that can be used to produce proteins, which are the complex molecules that do most of the work in our bodies.
How does DNA control the production of proteins?
The type of RNA that contains the information for making a protein is called messenger RNA (mRNA) because it carries the information, or message, from the DNA out of the nucleus into the cytoplasm. Through the processes of transcription and translation, information from genes is used to make proteins.
How do mutations in DNA affect protein synthesis?
Point mutations can cause serious changes to an organism if they change the way a protein works. A mutation in DNA alters the mRNA, which in turn can alter the amino acid chain. A base substitution may have three different effects on an organism’s protein.
How does a base substitution affect a protein?
A base substitution may have three different effects on an organism’s protein. It can cause a missense mutation, which switches one amino acid in the chain for another. It can cause a nonsense mutation, which results in a shorter chain because of an early stop codon.
What happens if the amino acid chain is wrong with DNA?
The amino acid chains are the basis of protein structure. So, if something goes wrong with the DNA, then the mRNA will also be wrong. If the mRNA is wrong, then the amino acid chain will be wrong. And that will cause a problem in the protein.
What determines the sequence of amino acids in DNA and RNA?
The central dogma says that DNA makes RNA and RNA makes protein. By this point, you probably know that the code in DNA determines the code in mRNA, and the code in mRNA determines the sequence of amino acids. The amino acid chains are the basis of protein structure.