9.1 Overview

Question 1

For all organisms, food molecules contain chemical energy that is released when:

Answer 1

their chemical bonds are broken

Question 2

organisms get the energy they need from:

Answer 2

food

Question 3

energy stored in food is express in:

Answer 3

units of calories

Question 4

organisms can obtain energy from food by:

Answer 4

cellular respiration

Question 5

Equation for cellular respiration:

Answer 5

6O₂ + C₆H₁₂O₆ yields 6CO₂ + 6H₂O + energy

Question 6

cells break down food molecules gradually capturing a little bit of:

Answer 6

chemical energy at key steps

Question 7

what are the 3 main stages of cellular respiration:

Answer 7

glycolysis, krebs cycle, electron transport chain

Question 8

In glycolysis, glucose eneters a chemical pathway and only a small amount of:

Answer 8

energy is captured to produce ATP

Question 9

In glycolysis, _____ of the chemical energy is unused, locked in chemical bonds of a molecule called _______

Answer 9

90%, pyruvic acid

Question 10

in the Krebs cycle a little more______ is generated

Answer 10

energy

Question 11

True or false?
In the electron transport chain, the bulk of energy is made.

Answer 11

true

Question 12

anytime a cells demand for energy increases, its use of oxygen _______

Answer 12

increases too

Question 13

which part of cellular respiration is anaerobic?

Answer 13

glycolysis

Question 14

glycolysis occurs in the ________

Answer 14

cytoplasm

Question 15

Krebs cycle and electron transport chain occur in the ________

Answer 15

mitochondira

Question 16

if oxygen is not present, _______ makes it possible for the cell to keep glycolysis running

Answer 16

fermentation

Question 17

Photosynthesis removes _____ from the atmosphere and cellular respiration puts it back

Answer 17

CO2

Question 18

Photosynthesis releases ______ into the atmosphere, and cellular respiration uses that oxygen to release energy from food

Answer 18

oxygen