K¹² Honors Biology 2.11 Mid-Unit Assessment- The Chemistry of Life Quiz

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Which statement is true of all organic compounds?

All contain carbon (CORRECT)

Which type of bond holds atoms together in a water molecule?

Covalent bond (CORRECT)

According to the concept of entropy, what will likely happen to most molecules over time?

They will break down (CORRECT)

How is an organic compound different from an inorganic compound?

Organic compounds contain carbon atoms bonded to other atoms (CORRECT)

Which statement best explains why a carbon atom can bond with itself easily?

It has four valence electrons (CORRECT)

How are hydrogen bonds different from covalent bonds?

Hydrogen bonds are weaker bonds that form from molecules that have a slight positive charge on one side and a slight negative charge on the other (CORRECT)

Which type of molecule is fat?

Lipid (CORRECT)

Which statement best explains why electrical signlas in the body are often based on ions?

Ions are charged particles (CORRECT)

Why is carbon present in so many types of molecules?

It can form up to four covalent bonds (CORRECT)

Study the diagrams. The dots represent valence electrons orbiting the nucleus if an atom. Which diagram shows the valence electron pattern for a carbon atom?

A (or the one with four small circles on a ring around a ball in the middle) (CORRECT)

Atoms of which three elements could bond together to form an organic compound?

carbon, hydrogen, oxygen (CORRECT)

Which property of water is likely the most significant in water’s role as a universal solvent?

Water molecules have positive and negative sides (CORRECT)

Which of the following is a direct result of hydrogen bonding?

Cohesion and adhesion (CORRECT)

Refer to the following scenario to answer Questions 14 and 15:

Scientists are studying compounds in a newly discovered rain forest plant. The plant produces an unusual substance that local people from the area say acts as an anesthetic.

One scientist tested the substance with the chemical indicator Sudan III. If the test is negative, which type of macromolecule is not present in the substance?

Lipid (CORRECT)

If another scientist tests the substance using iodine, which macromolecule is the scientist testing for?

Carbohydrate (CORRECT)

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