Question

1. arrange the steps of protein synthesis in order.

a. dna is transcribed into mrna
b. mrna travels to ribosome
c. ribosome translates mrna into a protein

1. how could a mutation in the dna sequence change the hair shaft?

a. by preventing mrna from forming
b. by eliminating the ribosome
c. by altering carbohydrate storage
d. by changing the amino acid sequence of the protein

1. why does only scalp hair show uhs even though the same dna is in all cells?

a. environmental stress blocks other follicles
b. other body hair has no dna
c. the mutation is active only in teenage years
d. only scalp cells transcribe the mutated gene for hair shaft proteins
ls.bio.2.1 use models to illustrate how cellular division results in the reproduction, growth, and repair of organisms.

1. how does mitosis help a child with uhs grow?

a. it creates new proteins
b. it repairs and increases the number of cells in hair follicles
c. it mixes chromosomes for variation
d. it copies mrna

Explanation:

3.

Protein synthesis starts with DNA being transcribed into mRNA (a). Then mRNA travels to the ribosome (b). Finally, the ribosome translates mRNA into a protein (c).

DNA sequence mutations affect protein synthesis. The amino - acid sequence of the protein is determined by the mRNA, which is transcribed from DNA. A mutation in DNA can change the mRNA codons, thus changing the amino - acid sequence of the protein (d). mRNA formation (a) is not the direct way a DNA mutation affects the hair shaft. Ribosomes (b) are not eliminated by a DNA mutation in the general sense of hair - shaft - related mutations. Carbohydrate storage (c) is not directly related to how a DNA mutation changes the hair shaft.

Gene expression is cell - specific. Even though all cells have the same DNA, only scalp cells transcribe the mutated gene for hair - shaft proteins (d). Environmental stress (a) is not the main reason for only scalp hair showing UHS. Other body hair has DNA (b). The mutation's activity is not limited to teenage years (c) as the question is about why only scalp hair shows UHS, not the age - related activity of the mutation.

Answer:

a, b, c

4.