Which of the following molecules would contain a polar covalent bond?

• Cl₂

• NaCl

• H₂O

• CH₄

Tags

NGSS.HS-PS1-2

Which of the following is most closely related to the secondary structure of proteins?

• lipids

• peptide bonds

• alpha helix

• cellulose

The process by which protein conformation is lost or broken down is

• dehydration synthesis

• translation

• denaturation

• hydrolysis

Which of the macromolecules below could be structural parts of the cell, enzymes, or involved in cell movement or communication?

• nucleic acids

• proteins

• lipids

• carbohydrates

The partial negative charge at one end of a water molecule is attracted to a partial positive charge of another water molecule. What is this type of attraction called?

• a polar covalent bond

• an ionic bond

• a hydration shell

• a hydrogen bond

Which two functional groups are always found in amino acids?

• amine and sulfhydryl

• hydroxyl and carboxyl

• carboxyl and amine

• phosphate group and nitrogenous base

Tags

NGSS.HS-LS1-6

The tremendous variation and unique properties of proteins are most likely a result of

• interactions between R groups of the amino acids

• hydrogen bonds lining amino acids

• the sequence of amino acids in the primary structure of the protein

• peptide bonds lining amino and carboxyl groups

Tags

NGSS.HS-LS1-6

Water is an excellent solvent. Select the property that justifies this statement.

• as a polar molecule, it can surround and dissolve ionic and polar molecules

• it forms ionic bonds with ions, hydrogen bonds with polar molecules, and hydrophobic interactions with non polar molecules

• it forms hydrogen bonds with itself so cohesion is possible

• it is liquid and will adhere to many substances

An organic compound that is composed of carbon, hydrogen, and oxygen in a 1:2:1 ratio is known as a

• lipid

• carbohydrate

• protein

• nucleic acid

Tags

NGSS.HS-LS1-6

If the pH of a solution is decreased from 7 to 6, it means that the concentration of

• H+ has decreased to 1/10 of what it was at pH 7

• H+ has increased 10 times what it was at pH 7

• OH- has increased 10 times what it was at pH 7

• OH- has increased by 1/7 of what it was