Proteins
A) are involved in almost every important function performed by a cell AND are characterized by a 1:3:1 ratio of carbon to hydrogen to oxygen.
B) comprise more than 50% of the dry weight of a cell AND are composed of a chain of nucleotides.
C) are involved in almost every important function performed by a cell AND comprise more than 50% of the dry weight of a cell.
D) are composed of a chain of amino acids AND are characterized by a 1:3:1 ratio of carbon to hydrogen and oxygen.
E) are characterized by a 1:2:1 ratio of carbon to hydrogen to oxygen AND are composed of a chain of nucleotides.

Question

Proteins
A) are involved in almost every important function performed by a cell AND are characterized by a 1:3:1 ratio of carbon to hydrogen to oxygen.
B) comprise more than 50% of the dry weight of a cell AND are composed of a chain of nucleotides.
C) are involved in almost every important function performed by a cell AND comprise more than 50% of the dry weight of a cell.
D) are composed of a chain of amino acids AND are characterized by a 1:3:1 ratio of carbon to hydrogen and oxygen.
E) are characterized by a 1:2:1 ratio of carbon to hydrogen to oxygen AND are composed of a chain of nucleotides.

Quizplus · Accepted Answer

Proteins are indeed crucial for nearly all cellular functions and make up more than half of the dry mass of cells. They are not characterized by a 1:3:1 ratio of carbon to hydrogen to oxygen (that's more characteristic of carbohydrates), nor are they composed of nucleotides (that's DNA and RNA). Proteins are made of amino acids.