TEKS 9B

Enzymes affect chemical reactions in living organisms by

• changing the direction of a reaction.

• breaking down molecules into starch.

• increasing the temperature range.

• weakening bonds in reactants.

• lowering the activation energy for a reaction.

Tags

NGSS.HS-PS1-2

Consider the relationship between a polymer and monomer. Which polymer is correctly matched with its monomer? Select all that apply.

• amino acid: lipid

• nucleic acid: nucleotide

• carbohydrate:monosaccharide:

• fatty acid: protein

• protein: amino acid

Some of these organic complex molecules are made up of building blocks containing 3 fatty acids bonded to a molecule of glycerol.

• Carbohydrates

• Lipids

• Proteins

• Nucleic Acid

Plant cells have mitochondria, which use glucose to produce ATP. From what process does the glucose in these plant cells originate?

• Photosynthesis

• Fermentation

• Exocytosis

• Diffusion

Tags

NGSS.HS-LS1-5

NGSS.HS-LS1-7

Enzymes are protein catalysts. What is the role of a catalyst?

• Provides extra energy for a reaction

• Lowers the activation energy of a reaction

• Allows only irreversible reactions to happen

• Eliminates the activation energy of a reaction

Fill in the missing parts of the statement below to correctly describe how a diagram of cellular respiration would differ from a diagram of photosynthesis. The cellular respiration diagram would show _________as the main energy source while the diagram of photosynthesis would show __________ as the main energy source.

Tags

NGSS.HS-LS1-5

NGSS.HS-LS1-7

Living things use enzymes in the chemical reactions of digesting food. When food is digested, it is metabolized (broken down) to release energy. Describe the role of an enzyme in this process.

Tags

NGSS.MS-LS1-7

Carbohydrates are more easily metabolized than lipids. However, on a gram-for-gram basis, lipids provide cells with more -

• Nitrogen

• Proteins

• Structure

• Energy

Tags

NGSS.HS-LS1-7

The activity for Enzyme A and Enzyme B are displayed on the graph below. Enzyme A is found in the stomach and Enzyme B is found in the intestinal tract of some animals.  

What is the probable pH of the stomach?

• 1

• 2

• 3

• 4

The speed of a planet varies as it orbits the Sun. What causes the speed of a planet's orbit to change when it is closer to the Sun?

• Heat from the sun

• a reverse in the direction of the planet's orbit

• Gravity from the Sun

• an increase in the number of objects close to the Sun

Tags

7.9B