Which of the following demonstrates the central dogma of molecular biologists?(1 point)
DNA and RNA mutate into either harmful or helpful effects on the human body.
DNA and RNA hold the code to create proteins that are the key to gene expression.
Gene expression relies on environmental factors that determine which traits are dominant.
Proteins replicate DNA which gives the expression of traits to an organism.
DNA: Gene Expression (unit 7, lesson 4)
1. Which of the following demonstrates the central dogma of molecular biologists?
B: DNA and RNA hold the code to create proteins that are the key to gene expression
2. After the amino acid chain leaves the ribosome, which organelle then folds, modifies, and transports the protein?
D: Endoplasmic Reticulum
3. Look at the DNA sequence.
C G T T A C T G C A A T
G C A A T G A C G T T A
Which sequence shows a substitution mutation?
C:
C G T G A C T G C A A T
G C A C T G A C G T T A
4. Which of the following best describes how a liver cell and skin cell have the exact same DNA sequence and yet look different and perform different functions?
C: The proteins are expressed differently in each cell
5. Stella described protein synthesis as a process that makes the necessary proteins for the human body to function. She explained the process in the following steps.
1. DNA is transcribed into mRNA.
2. Amino acids form a chain.
3. The amino acid chain is folded into a protein in the endoplasmic reticulum.
What step did Stella miss in her explanation?
A: mRNA is translated into amino acids
witch one is it
The correct answer is:
DNA and RNA hold the code to create proteins that are the key to gene expression.
The correct option that demonstrates the central dogma of molecular biology is:
DNA and RNA hold the code to create proteins that are the key to gene expression.
To understand how this option aligns with the central dogma, let's break it down:
The central dogma of molecular biology is a fundamental concept that describes the flow of genetic information within a biological system. It states that genetic information flows from DNA to RNA to proteins.
In this option, it is stated that DNA and RNA hold the code to create proteins. DNA, which carries the genetic information, is transcribed into RNA in a process called transcription. Then, RNA is translated into proteins in a process called translation. These proteins are essential for various cellular functions and are the key to gene expression.
To arrive at this answer, you can eliminate the other options:
- Option 1: DNA and RNA mutating into harmful or helpful effects on the human body is not related to the central dogma. Although mutations can have consequences, they do not directly represent the flow of genetic information.
- Option 3: Environmental factors influencing gene expression is not part of the central dogma. It is true that gene expression can be influenced by environmental factors, but the central dogma focuses on the flow of information from DNA to RNA to proteins.
- Option 4: Proteins do not replicate DNA. DNA replication is a separate process that occurs prior to gene expression. Proteins do play a role in DNA replication, but they do not directly replicate DNA themselves. Therefore, this option does not accurately represent the central dogma.
By considering these explanations and testing each option against the concept of the central dogma, you can determine that the correct answer is option 2: DNA and RNA hold the code to create proteins that are the key to gene expression.