Processes in which cellular energy is used to make complex molecules from simpler ones are described as anabolic.
Missing Word
anabolic
Anabolic processes, also known as biosynthesis, involve the construction of complex molecules from simpler precursors. These processes require energy input, typically in the form of ATP, to create new chemical bonds.
Question 2
The loss of an electron from a molecule is called oxidation.
Missing Word
oxidation
Oxidation is defined as the loss of electrons from a molecule, atom, or ion. This process often involves the addition of oxygen or the removal of hydrogen and results in an increase in the oxidation state of the molecule.
Question 3
The part of an enzyme to which a substrate binds is called the active site.
Missing Words
active, site
The active site is the specific region of an enzyme where the substrate binds and undergoes a chemical reaction. The shape and chemical properties of the active site are complementary to the substrate, allowing for specific and efficient catalysis.
Question 4
Per turn of the Krebs cycle, one acetyl group is oxidized to produce three NADH molecules.
Missing Word
three
The Krebs cycle oxidizes one acetyl-CoA molecule per turn, yielding specific quantities of key energy carriers and waste products. Specifically, each turn produces 2 CO2 molecules, 1 ATP (or GTP) molecule, 3 NADH molecules, and 1 FADH2 molecule, which are crucial for subsequent ATP production via oxidative phosphorylation.
Question 5
Most commonly, glycolysis occurs by the Embden-Meyerhof pathway.
Missing Word
Embden-Meyerhof
The Embden-Meyerhof pathway is the most prevalent glycolytic pathway in cells. It involves a series of enzymatic reactions that break down glucose into pyruvate, generating ATP and NADH in the process.
Question 6
The final ETS complex used in aerobic respiration that transfers energy-depleted electrons to oxygen to form H2O is called cytochrome oxidase.
Missing Words
cytochrome, oxidase
Cytochrome oxidase is the terminal enzyme complex in the electron transport system (ETS) during aerobic respiration. It catalyzes the transfer of electrons to oxygen, reducing it to water and contributing to the proton gradient that drives ATP synthesis.
Question 7
The passage of hydrogen ions through ATP synthase down their electrochemical gradient harnesses the energy needed for ATP synthesis by oxidative phosphorylation.
Missing Word
ATP synthase
ATP synthase is a crucial enzyme that utilizes the proton motive force (electrochemical gradient of hydrogen ions) generated by the electron transport chain. As protons flow through ATP synthase, the energy released is used to phosphorylate ADP, producing ATP through oxidative phosphorylation.
Question 8
The microbe responsible for ethanol fermentation for the purpose of producing alcoholic beverages is yeast (Saccharomyces cerevisiae).
Missing Word
yeast (Saccharomyces cerevisiae)
Yeast, particularly Saccharomyces cerevisiae, is widely used in the production of alcoholic beverages. It ferments sugars into ethanol and carbon dioxide, a process essential for brewing beer, making wine, and baking bread.
Question 9
Heterolactic fermentation results in the production of a mixture of fermentation products, including lactic acid, ethanol and/or acetic acid, and CO2.
Missing Word
Heterolactic fermentation
Heterolactic fermentation is a type of fermentation where glucose is converted into a mixture of products, including lactic acid, ethanol and/or acetic acid, and carbon dioxide. This pathway is characteristic of certain bacteria, such as Leuconostoc species.
Question 10
Fermenting organisms make ATP through the process of glycolysis.
Missing Word
glycolysis
Fermenting organisms rely on glycolysis as their primary means of ATP production. Glycolysis breaks down glucose into pyruvate, generating a small amount of ATP and NADH, without the need for oxygen or an electron transport chain.
Question 11
The process by which two-carbon units are sequentially removed from fatty acids, producing acetyl-CoA, FADH2, and NADH is called β-oxidation.
Missing Word
β-oxidation
β-oxidation is the metabolic process by which fatty acids are broken down into acetyl-CoA molecules. This process also generates FADH2 and NADH, which are subsequently used in the electron transport chain to produce ATP.
Question 12
The NADH and FADH2 produced during β-oxidation are used to make ATP by oxidative phosphorylation.
Missing Word
ATP by oxidative phosphorylation
The NADH and FADH2 molecules produced during β-oxidation are high-energy electron carriers. They donate their electrons to the electron transport chain, driving the proton gradient that powers ATP synthesis by oxidative phosphorylation.
Question 13
Skim milk agar is a type of medium used to detect the production of an extracellular protease called caseinase.
Missing Words
Skim, milk, agar
Skim milk agar is used to detect caseinase production because it contains casein, the main protein in milk. If a microorganism produces caseinase, it will hydrolyze the casein, resulting in a clear zone around the colony on the agar plate.
Question 14
The enzyme responsible for CO2 fixation during the Calvin cycle is called ribulose bisphosphate carboxylase (RuBisCO).
Missing Word
ribulose bisphosphate carboxylase (RuBisCO)
RuBisCO is the key enzyme in the Calvin cycle, catalyzing the carboxylation of ribulose-1,5-bisphosphate, the initial step in fixing atmospheric carbon dioxide into organic molecules. Without RuBisCO, autotrophs would be unable to convert inorganic carbon into sugars.
Question 15
The types of pigment molecules found in plants, algae, and cyanobacteria are chlorophylls and carotenoids.
Missing Word
chlorophylls
Chlorophylls are the primary photosynthetic pigments, capturing light energy, while carotenoids are accessory pigments that broaden the range of light wavelengths absorbed and also provide photoprotection. These pigments are essential for photosynthesis in plants, algae, and cyanobacteria.
Question 16
The molecule central to the carbon cycle that is exchanged within and between ecosystems, being produced by heterotrophs and used by autotrophs, is carbon dioxide.
Missing Word
carbon dioxide
Carbon dioxide (CO2) is the central molecule in the carbon cycle, linking autotrophs and heterotrophs. Autotrophs use CO2 during photosynthesis to produce organic compounds, while heterotrophs release CO2 during respiration as they break down these compounds.
Question 17
The use of microbes to remove pollutants from a contaminated system is called bioremediation.
Missing Word
bioremediation
Bioremediation utilizes the metabolic capabilities of microorganisms to degrade or transform environmental contaminants into less harmful substances. This process can be applied to a wide range of pollutants, offering a sustainable approach to environmental cleanup.