Biology 103 Chapter 6
Terms in this set (36)
Plants are net
O2 producers and CO2 consumers.
Animals are net
O2 consumers and CO2 producers.
In animal, plant, fungal, and algal cells, the primary organelle that generates molecules of ATP is the
The chemical formula for glucose is:
During glycolysis molecules of glucose are
broken down by enzymes to form two molecules of pyruvate.
Glycolysis of a glucose molecule
produces a net gain of two molecules of ATP
The three main biochemical pathways of cellular respiration are
glycolysis, Krebs cycle, and electron transport.
Glycolysis occurs in the
The electrons that are transferred during cellular respiration are carried in the electron carrier molecules
NADH and FADH2.
Identify which of these places the steps of cellular aerobic respiration in the correct sequence.
glycolysis - formation of Acetyl CoA - Krebs cycle - electron transport chain - ADP phosphorylation
The "spent" electrons from electron transport in aerobic respiration are transferred to
oxygen, reducing it with with hydrogen to form water.
In a eukaryotic cell, the Krebs cycle occurs in the
The enzyme that forms a transport channel in the inner membrane of the mitochondria and phosphorylates ADP is
The products of cellular respiration are
carbon dioxide, water, and ATP.
The reactants for cellular respiration are
glucose and oxygen.
On a class field trip, students swabbed, dug, and dipped samples of life from numerous places around campus. Back in lab, one of the organisms found was unknown to the professor, or any reference books available. It came from the edge of a marsh, and the sample smelled of hydrogen sulfide (rotten eggs). The single cells were found to survive only in a container that had sulfate in it, but also had the oxygen removed by burning a candle. This is likely an organism that uses _____ for cellular respiration.
In eukaryotic cells, the electrons donated by NADH and FADH2 are transported along electron transport proteins in the
inner mitochondrial membrane.
Glycolysis does not require
During glycolysis, ________ molecules of ____________ are required to "activate" glucose
The net ATP production in glycolysis is only two because
two ATPs are used to "activate" glucose, while 4 ATPs are produced in remaining glycolysis steps.
Only a small amount of ATP is produced during glycolysis because most of the energy stored in a glucose molecule remains in the bonds of
The compound that enters the Krebs cycle as a reactant is
The sole source of ATP production in cells using fermentation only is
The Krebs cycle produces
ATP, NADH, and FADH2.
Since the Krebs cycle is a cyclic pathway, the original acceptor needed to start the Krebs cycle and the end product of the Krebs cycle are
the same molecule.
Glycolysis and the Krebs cycle do not capture all of the energy in a glucose molecule because
some energy is always lost as heat during chemical reactions
The sequence of membrane proteins of the electron transport chain includes three transport proteins and other electron transport proteins. As the electrons from original glucose molecules move through the proteins, work is done. The electron transport chain produces a(n) _____________ concentration gradient.
Muscle cells use lactic acid fermentation to
generate NAD+ so that glycolysis can continue in the absence of oxygen.
is carried out by yeasts.
produces far less ATP than aerobic respiration.
----All of the answer choices are correct.
produces carbon dioxide.
The most ancient of the energy pathways among organisms is probably
Compared to the air a person inhales, the air that they exhale has
a lower concentration of O2 and a higher concentration of CO2
The first steps in glycolysis involve
adding two phosphates from ATP to glucose.
What first happens to the carbon atoms that enter the Krebs cycle as acetyl CoA?
They combine with a four-carbon sugar to form a six-carbon sugar.
The reactions in glycolysis are reversible, however, the conversion of pyruvate into acetyl CoA is irreversible in animal cells. Can fatty acids be converted back into carbohydrates?
Yes, because they enter metabolism in the Krebs cycle.
---No, because they enter metabolism as acetyl CoA.
No, because they enter metabolism as pyruvate.
Yes, because they enter metabolism as pyruvate.
Yes, because they enter metabolism as acetyl CoA.
During fermentation, ___ ATP can be produced per glucose, compared with ____ by aerobic respiration.
The rate of carbon dioxide production by Cyclocephala colasi beetles was used to measure their
rate of respiration.
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