Chromosomes, Genes & DNA

Question 1

An atom of chlorine has 17 protons and a mass number of 35. How many neutrons are present in this atom?

Accepted Answer

18

Answer

16

Answer

35

Answer

17

Question 2

Scientists discover that a single‑base substitution in a gene on chromosome 12 changes the codon from GAA to GAC, resulting in a different amino acid at one position of the protein. Which statement best explains how this mutation could have a harmful effect on the organism?

Accepted Answer

The new amino acid may alter the protein’s three‑dimensional shape, preventing it from performing its normal function.

Answer

The mutation changes the DNA sequence, but proteins are made from RNA, so the protein will be unchanged.

Answer

Since only one base is changed, the protein’s overall structure remains the same, so there is no effect on the organism.

Answer

All mutations that change a codon are always beneficial because they increase genetic diversity.

Question 3

An atom of chlorine has an atomic number of 17 and a mass number of 35. How many neutrons are present in this atom?

Accepted Answer

18

Answer

52

Answer

17

Answer

35

Try three questions

An atom of chlorine has 17 protons and a mass number of 35. How many neutrons are present in this atom?

Scientists discover that a single‑base substitution in a gene on chromosome 12 changes the codon from GAA to GAC, resulting in a different amino acid at one position of the protein. Which statement best explains how this mutation could have a harmful effect on the organism?

An atom of chlorine has an atomic number of 17 and a mass number of 35. How many neutrons are present in this atom?

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