Keystone Homework #4

A teacher demonstrated protein formation to a science class . The model shows three steps the teacher used in the demonstration . How can the steps in the model best be described?

• In Step 1, amino acid monomers are present . In Step 2, the monomers are attached together to form a protein polymer . In Step 3, more amino acid monomers are added to the chain, making a larger protein .

• In Step 1, nucleotide monomers are present . In Step 2, the monomers are attached together to form a protein polymer . In Step 3, more nucleotide monomers are added to the chain, making a larger prot

Which statement best describes how amino acids become polymers?

• Water is added as amino acids link to form proteins .

• Water is released as amino acids break apart to form proteins .

• Peptide bonds link amino acids together as proteins form .

• Peptide bonds break between amino acids as proteins form

Which biological molecules are most likely represented by molecules 1 and 2?

• molecule 1: lipid molecule 2: nucleic acid

• nucleic acid B . molecule 1: lipid molecule 2: protein

. Which property of water is most responsible for plants being able to transport water from their roots to their leaves?

• the attraction between molecules

• a capacity to dissolve many substances

• the ability to form a low-density crystalline structure when frozen

• a capacity to absorb large amounts of energy as temperature increases

Cells are largely made of organic compounds that contain carbon. Which property of the carbon atom makes it an essential component of organic compounds?

• Carbon is a nonmetal.

• Carbon oxidizes to carbon dioxide.

• Carbon is solid at room temperature.

• Carbon can form four covalent bonds.

Which two students correctly described organic compounds?

• students 1 and 2

• students 2 and 3

• students 3 and 4

• students 2 and 4