Bio Chapter 8: Test your understanding
which of the following statements is a correct distinction between autotrophs and heterotrophs? (a.) autotrophs, but not heterotrophs, can nourish themselves beginning with CO2 and other nutrients that are inorganic (b.) only heterotrophs require chemical compounds from the environment (c.) cellular respiration is unique to heterotrophs (d.) only heterotrophs have mitochondria
(a.) autotrophs, but not heterotrophs, can nourish themselves beginning with CO2 and other nutrients that are inorganic
which of the following sequences correctly represents the flow of electrons during photosynthesis? (a.) NADPH -> O2 -> CO2 (b.) H2O -> NADPH -> Calvin Cycle (c.) H2O -> photosystem I -> photosystem II (d.) NADPH -> electron transport chain -> O2 (e.) NADPH -> chlorophyll -> Calvin cycle
(b.) H2O -> NADPH -> Calvin Cycle
which of the following processes could still occur in a chloroplast in the presence of an inhibitor that prevents H+ from passing through ATP synthase complexes? (a.) sugar synthesis (b.) generation of a proton-motive force (c.) photophosphorylation (d.) the Calvin cycle (e.) oxidation of NADPH
(b.) generation of a proton-motive force
in mechanism, photophosphorylation is most similar to (a.) substrate-level phosphorylation in glycolysis (b.) oxidative phosphorylation in cellular respiration (c.) carbon fixation (d.) reduction of NADP+ (e.) the Calvin cycle
(b.) oxidative phosphorylation in cellular respiration
cooperation of the two photosystems of the chloroplast is required for (a.) ATP synthesis (b.) reduction of NADPH+ (c.) cyclic photophosphorylation (d.) oxidation of the reaction center of photosystem I (e.) generation of a proton-motive force
(b.) reduction of NADPH+
how is photosynthesis similar in C4 plants and CAM plants? (a.) in both cases, electron transport is not used (b.) both types of plants make sugar without the Calvin cycle (c.) in both cases, rubisco is not used to fix carbon initially (d.) both types of plants make most of their sugar in the dark
(c.) in both cases, rubisco is not used to fix carbon initially
which of the following does NOT occur during the Calvin cycle (a.) carbon fixation (b.) oxidation of NADPH (c.) release of oxygen (d.) regeneration of the CO2 acceptor
(c.) release of oxygen
which process is most directly driven by light energy? (a.) creation of a pH gradient by pumping protons across the thylakoid membrane (b.) reduction of NADP+ molecules (c.) transfer of energy from pigment molecule to pigment molecule (d.) ATP synthesis
(c.) transfer of energy from pigment molecule to pigment molecule
the light reactions of photosynthesis supply the Calvin cycle with (a.) light energy (b.) CO2 and ATP (c.) O2 and NADPH (d.) ATP and NADPH (e.) sugar and O2
(d.) ATP and NADPH
which of the following conclusions does not follow from studying the absorption spectrum for chlorophyll a and the action spectrum for photosynthesis (a.) not all wavelengths are equally effective for photosynthesis (b.) there must be accessory pigments that broaden the spectrum of light that contributes energy for photosynthesis (c.) the red and blue areas of the spectrum are most effective in driving photosynthesis (d.) chlorophyll owes its color to the absorption of green light (e.) chlorophyll a has two absorption peaks
(d.) chlorophyll owes its color to the absorption of green light
which of the following statements is a correct distinction between cyclic and noncyclic photophosphorylation? (a.) only noncyclic photophosphorylation produces ATP (b.) in addition to ATP, noncyclic photophosphorylation also produces O2 and NADPH (c.) only cyclic photophosphorylation utilizes light at 700 nm (d.) chemiosmosis is unique to noncyclic photophosphorylation (e.) only cyclic photophosphorylation can operate in the absence of photosystem II
(e.) only cyclic photophosphorylation can operate in the absence of photosystem II
to synthesis one glucose molecule, the Calvin cycle uses _____ molecules of CO2, _____ molecules of ATP, and _____ molecules of NADPH
6, 18, 12