1~ What is the original source of energy in the food you eat?(1 point) sugar
plants*
photosynthesis
sun

2~ Why are leaves red in the fall?(1 point)

Chlorophyll breaks down because there's less sunlight
Mitochondria breaks down because there's less sunlight.
Chlorophyll reflects green light in the fall.*
Chlorophyll absorbs red in the fall, rather than green.

3~ Which statement is true?(1 point)

The Calvin cycle is the light-dependent (needs light) step of photosynthesis and happens in the thylakoid membrane.*

The Calvin cycle is the light-dependent (needs light) step of photosynthesis and happens in the stroma.

The Calvin cycle is the light-independent (does not need light) step of photosynthesis and happens in the thylakoid membrane.

The Calvin cycle is the light-independent (does not need light) step of photosynthesis and happens in the stroma.

4~ The original energy for photosynthesis to begin comes from:(1 point)

carbon dioxide molecules
light
water molecules
ATP *

5~ Which equation best models cellular respiration?(1 point)

C6H12O6 + 6O2 → 6H2O + 6CO2 + Energy*

C6H12O6 + 6O2 + 6CO2 → 6H2O + Energy

6H2O + 6CO2 + Energy → C6H12O6 + 6O2

6H2O + 6CO2 → C6H12O6 + 6O2 + Energy

6~ Lactic acid fermentation can be modeled by which equation?(1 point)

Lactic acid + NADH → Pyruvic acid + NAD+

Pyruvic acid + NADH → Lactic acid + NAD+

Pyruvic acid + NAD+ → Lactic acid + NADH *

Lactic acid + NADH → Pyruvic acid NADH

7~ In the Krebs cycle, how is citric acid formed?(1 point)

Acetyl-CoA joins with a large molecule called oxaloacetic acid.*

Carbon dioxide bonds with a chain of coenzyme A.

Enzymes combine hydrogen ions, oxygen, and electrons.

Pyruvic acid molecules are broken down by an acetyl group.

8~ Which macromolecule provides the energy that starts glycolysis?(1 point)

ATP

sugar*

water

carbon dioxide

9~ During which phase of cellular respiration is carbon dioxide released?(1 point)

glycolysis

digestion

Krebs cycle*

electron transport chain

10~ Which compound is a reactant in cellular respiration?(1 point)

oxygen

ATP

carbon dioxide *

water

11~ How many O2 molecules are required for two glucose molecules to undergo cellular respiration?(1 point)

2

12

18

6*

12~Which statement is true?(1 point)

Ectotherms cannot insulate (stop heat loss from) their bodies and can only control their body temperature involuntarily.

Endotherms can insulate (stop heat loss from) their bodies but can only control their body temperature by choice.

Ectotherms can insulate (stop heat loss from) their bodies and can control their body temperature by choice.

Endotherms cannot insulate (stop heat loss from) their bodies and can only control their body temperature involuntarily.*

13~ Which activity uses ATP to raise body temperature?(1 point)

storing fats

panting

hibernating

shivering*
14~ How can Gram staining be used to determine how bacteria respond to their environments?(1 point)

Gram staining helps scientists visualize bacterial antibiotic resistance.*

Gram staining helps scientists visualize the thickness of bacterial cell walls.

Gram staining helps scientists visualize the composition of bacterial cell membranes.

Gram staining helps scientists visualize bacterial motility.

15~ Which statement is true?(1 point)

Most protists can respire with small amounts of oxygen.

Most protists only respire without oxygen.

Most protists only respire with oxygen.*

Most protists can respire with and without oxygen at will.

Pls help ∵