33. Cellulose is a polysaccharide that is a major component of:

(A) animal cell membranes.

(B) fungal cell walls.

(C) plant cell walls.

(D) bacterial capsules.

(E) insect exoskeletons.

34. Lignin's role in plant transition from aquatic to terrestrial environments was to: (A) protect early aquatic plants only in freshwater. (B) allow plants to grow tall with rigid stems, providing structural support against gravity. (C) serve as a cuticle component preventing any water loss. (D) be primarily responsible for vibrant flower colors. (E) significantly decrease photosynthetic efficiency.

35. Which statement is accurate regarding metabolism? (A) Energy from exergonic reactions is never coupled to drive endergonic reactions. (B) Endergonic reaction products have less potential energy, releasing energy. (C) Metabolism encompasses all chemical reactions, where exergonic energy (via ATP) drives endergonic. (D) Cellular respiration is exergonic, but it does not store energy in ATP. (E) Photosynthesis is an exergonic process that breaks down energy-rich molecules.

36. Which statement accurately describes the processes of photosynthesis? (A) Initial light-capturing reactions occur in thylakoid membranes, converting light into ATP/NADPH, releasing oxygen. (B) Splitting carbon dioxide releases oxygen as a byproduct. (C) Carbon fixation (Calvin cycle) takes place in the cytoplasm. (D) Electrons from chlorophyll go directly to ATP synthase. (E) Cellular respiration exclusively sustains light-independent reactions during night.

37. In photosynthesis, the splitting of water molecules (photolysis) directly contributes to the production of: (A) glucose and carbon dioxide. (B) ATP and NADPH for the Calvin cycle. (C) electrons, protons (H+), and oxygen gas. (D) pigments within the thylakoid membrane.. (E) ATP only, without NADPH.

38. The Calvin cycle (light-independent reactions) in photosynthesis primarily involves: (A) capturing light energy independently from water splitting. (B) producing ATP and NADPH from light energy. (C) converting carbon dioxide into sugars using ATP and NADPH. (D) releasing oxygen as a byproduct. (E) occurring exclusively during the night.

39. Which statement accurately describes key conceptual aspects of cellular respiration? (A) Glycolysis is a universal process that occurs with or without oxygen, serving as glucose's initial breakdown. (B) Pyruvate oxidation and citric acid cycle fully oxidize all oxygen atoms from glucose. (C) Oxidative phosphorylation uses ATP and FADH2 energy to produce NADH via single-step redox reactions. (D) The electron transport chain creates a sugar gradient for ATP synthesis. (E) Most aerobic ATP is produced exclusively in glycolysis.

40. Most of the ATP generated during aerobic cellular respiration is produced during: (A) glycolysis. (B) pyruvate oxidation. (C) the citric acid cycle. (D) oxidative phosphorylation. (E) fermentation.

41. The primary role of oxygen in aerobic cellular respiration is to: (A) directly produce ATP. (B) oxidize glucose during glycolysis. (C) act as an enzyme in the citric acid cycle. (D) serve as the final electron acceptor in the electron transport chain. (E) create a proton gradient across the mitochondrial membrane.

42. Which statement accurately describes a key event or outcome of meiosis? (A) Meiosis produces four genetically identical daughter cells. (B) In meiosis I, sister chromatids separate. (C) Crossing over occurs during prophase II. (D) Meiosis involves two successive cell divisions, resulting in four genetically unique haploid cells. (E) Meiosis's primary purpose is to repair damaged somatic cells.

43. Which statement accurately describes a fundamental concept in Mendelian genetics? (A) Mendel used cross-pollinating peas, which made true-breeding lines easy to establish. (B) Dominant alleles have a higher inheritance frequency. (C) The Law of Segregation states that during gamete formation, alleles for a character separate and end up in different gametes. (D) Repeated self-pollination was not necessary to obtain true-breeding lines. (E) Mendel concluded independent sorting, though his chosen genes were always linked.

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