unit 3 (biochem) test review

The major role of carbohydrates in the human diet is to

• form the membranes that surround mitochondria

• act as a catalyst for cellular reactions

• supply energy for the body

• provide building blocks for amino acids

Tags

NGSS.MS-LS1-7

NGSS.MS-LS2-3

Proteins, starch, and DNA are similar in that they are all

• organic compounds

• parts of genes

• made of amino acids

• made of simple sugars

The energy in this molecule is stored

• in the bonds between atoms

• in the oxygen found in the molecule

• when the carbon atoms break off

• when water breaks this molecule apart

Tags

NGSS.HS-LS1-7

NGSS.HS-PS1-4

Even though human proteins are synthesized from only 20 different amino acids, there are thousands of different proteins found in human cells. This great variety of proteins is possible because the

• chemical composition of a specific amino acid can vary

• sequence and number of amino acids can be different in each protein

• size of a specific amino acid can vary within a protein

• same amino acid can have many different properties

Tags

NGSS.HS-LS1-1

The function of a specific enzyme is most directly influenced by its

• stored energy

• carrying capacity

• molecular size

• physical shape

Chemicals that help chemical reactions occur at faster rates in living organisms are known as

• biotic resources

• simple sugars

• oxygen molecules

• organic catalysts

Which statement explains the importance of maintaining a constant internal environment to ensure proper enzyme functioning?

• Changes in pH and temperature will cause the enzyme reaction rate to be too fast.

• Temperature and pH determine amino acid sequences in enzymes.

• Changes in pH will change the genetic instructions of enzymes.

• Increasing the temperature and pH can alter the specific shape of enzymes.

This process best represents

• the bonding of amino acids to form a starch molecule

• the digestion of amino acids to form a starch molecule

• the digestion of simple sugars to form a starch molecule

• the bonding of simple sugars to form a starch molecule

Tags

NGSS.MS-LS1-7

Which statement best describes enzymes?

• Every enzyme controls many different reactions.

• The rate of activity of an enzyme might change as pH changes.

• Temperature changes do not affect enzymes.

• Enzymes are produced from the building blocks of carbohydrates.

Increasing body temperature to 40°C would interfere most directly with the rate of function of structure

• A

• B

• C

• D

Tags

NGSS.HS-LS1-3