Which of the following demonstrates the central dogma of molecular biologists? (1 point)
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 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.
DNA and RNA hold the code to create proteins that are the key to gene expression.
What type of mutation is shown below? DNA Sequence: TTA-GCG-ATC
Copy of DNA Sequence: AAC-TCG-CTA-G (1 point)
Deletion
Insertion
Substitution
Inversion
Deletion
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? (1 point)
The proteins are expressed differently in each cell.
The cells discard the DNA that is not in use.
The tRNA uses a different sequence in each cell during transcription.
The cells mutate during transcription.
The proteins are expressed differently in each cell.
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?
(1 point)
DNA is replicated into two daughter cells. Polypeptide chains express gene traits. mRNA is translated into amino acids. tRNA delivers the DNA to the ribosome.