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Bio exam 3
| Question | Answer |
|---|---|
| _______ is lifeâs primary source of energy. Food Water Sunlight ATP | Sunlight |
| Which of the following statements is not correct? Energy cannot be created or destroyed Energy cannot change from one form to another Energy tends to disperse spontaneously | Energy cannot change from one form to another |
| Entropy _____ Disperse Is a measure of disorder Always increases, overall Disperse and is a measure of disorder | Disperse and is a measure of disorder |
| If we liken a chemical reaction to an energy hill, then a(n) ______ reaction is an uphill run. Endergonic Exergonic Catalytic Both endergonic and catalytic | Endergonic |
| If we liken a chemical reaction to an energy hill, then activation energy is like _______ A burst of speed Coasting downhill A bump at the top of a hill | A bump at the top of a hill |
| _______ are always changed by participating in a reaction ( choose all that are correct ) Enzymes Cofactors Reactants Coenzymes | Reactants and coenzymes |
| Name one environmental factor that typically influences enzyme function. | Temperature, pH, pressure, salt |
| A metabolic pathway may__________ Build or break down molecules Include an electron transfer chain Generate heat All of the above | All of the above |
| All antioxidants _______ Prevent other molecules from being oxidized Are necessary in the human diet Balance charge Deoxidize free radicals | Deoxidize free radicals |
| Solutes tend to diffuse from a region where they are _____ (more/less) concentrated to an adjacent region where they are _______(more/less) concentrated. | More, less |
| ______ cannot easily diffuse across a lipid bilateral. Water Grass Ions All of the above | Ions |
| A transport protein require ATP to pump sodium ions across a membrane. This is a case of ______. Passive transport Active transport Facilitated diffusion Passive transport and facilitated diffusion | Active transport |
| Immerse a human blood cell in a hypotonic solution and water ______ Diffuses into the cell Diffuses out of the cell Shows no net movement Moves in by endocytosis | Diffuses into the cell |
| Vesicles form during _____ Endocytosis Exocytosis Phagocytosis Endocytosis and phagocytosis | Endocytosis and phagocytosis |
| Reactant | Enters a reaction |
| Phagocytosis | One cell engulfs another |
| First law of thermodynamics | Energy cannot be created or destroyed |
| Product | Forms at reactions end |
| Cofactor | Assists enzymes |
| Concentration gradient | Basis of diffusion |
| Passive transport | No energy input required |
| Active transport | Requires energy input |
| A cat eats a bird, which ate a caterpillar that chewed on a weed. Which of these organisms are autotrophs? Which ones are heterotrophs? | A: weed H: cat, bird, caterpillar |
| Which of the following statements is incorrect? Pigments absorb light of certain wavelengths only. Many accessory pigments are multipurpose molecules. Chlorophyll is a green because it absorbs green light. | Chlorophyll is a green because it absorbs green light. |
| In plants the light dependent reactions proceed at/ in the ______. Thylakoid membrane Plasma membrane Strong Cytoplasm | Thylakoid membrane |
| When a photosystem absorb light ______. Sugar phosphates are produced Electrons are transferred to ATP RuBP accepts electrons Electrons are ejected from its special pair | Electrons are ejected from its special pair. |
| In the light dependent reactions, _____ Caribou dioxide is fixed ATP forms Sugars form CO2 accepts electrons ATP forms and sugars form Carbon dioxide is fixed and sugars form | ATP forms |
| What accumulates inside the thylakoid compartment during the light dependent reactions? Sugars Hydrogen ions O2 CO2 | Hydrogen ions |
| Light independent reactions in plants proceed at/in the _____ of chloroplasts. Thylakoid membrane Plasma membrane Stroma Cytoplasm | Stroma |
| The atoms in the molecular oxygen released during photosynthesis come from split _____ molecules. Sugar CO2 Water O2 | Water |
| The Calvin Benson cycle starts when ________ Light is available Carbondioxide is attached to RuBP Electrons leave photosystem 2 | Carbondioxide is attached to RuBP |
| Which of the following substance does not participate in the Calvin Benson cycle? ATP O2 NADPH RuBP PGAL CO2 | O2 |
| Plants use energy in ______ to drive photosynthesis. Light Hydrogen ions O2 CO2 | Light |
| Most of the carbon dioxide used in photosynthesis comes from _______. Glucose The atmosphere Rainwater Photolysis | The atmosphere |
| PGAL formation | ATP, NADPH needed |
| CO2 fixation | Rubisco function |
| Photolysis | Water molecules split |
| ATP forms; NADPH does not | Electron cycle back to photosystem 1 |
| Photorepiration | Problem in C3 plants |
| Photosynthesis | Converts light to chemical energy |
| Pigment | Absorbs light |
| Autotroph | Self feeder |
| Mitochondrial matrix | Inner space |
| Pyruvate | Product of glycolysis |
| NAD+ | Needed for glycolysis |
| Mitochondrion | Makes many ATP |
| NADH | Reduced coenzyme |
| Anaerobic | No oxygen required |
| Hydrogen ion flow drives ATP synthesis during _______. Glycolysis The Krebs cycle Aerobic respiration Fermentation Both glycolysis and aerobic respiration | Aerobic respiration |
| Which of the following is not produced by an animal muscle cell operating under anaerobic conditions? Heat Lactate ATP NAD+ Pyruvate All are produced | All are produced |
| You body cells can break down _____ as a source of energy to fuel ATP production. Fatty acids Glycerol Amino acids All of the above | All of the above |
| _____ accepts electrons in alcoholic fermentation. Oxygen Pyruvate Acetaldehyde Ethanol | Ethanol |
| Most of the energy that is released by the full breakdown of glucose to CO2 and water ends up in _____. NADH ATP Heat Electrons | ATP |
| In the third stage of aerobic respiration, _____ is the final acceptor of electrons. Water Hydrogen Oxygen NADH | Oxygen |
| After the Krebs reactions run through _______ cycle, one Glucose has been completely broken down to CO2. One Two Three Six | Two |
| Which of the following reaction pathways is not part of the second stage of aerobic respiration? ETP Acetyl-CoA formation Krebs cycle Glycolysis ETP and glycolysis | ETP and Glycolysis |
| In eukaryotes fermentation is completed in the _______. Nucleus Mitochondrion Plasma membrane Cytoplasm | Cytoplasm |
| In eukaryotes aerobic respiration is completed in the _____. Nucleus Mitochondrion Plasma membrane Cytoplasm | Mitochondrion |
| Which molecule does not form glycolysis? NADH Pyruvate Oxygen ATP | Oxygen |
| Which of the following metabolic pathways require molecular oxygen? Aerobic respiration Lactate fermentation Alcoholic fermentation All of the above | Aerobic respiration |
| Glycolysis starts and ends in the _______. Nucleus Mitochondrion Plasma membrane Cytoplasm | Cytoplasm |
| True/False. Blume animals which make ATP by aerobic respiration, plants make all of their ATP by photosynthesis. | True |
Created by:
Jasminemarisa