Campbell Biology 12th Edition Urry Cain Wasserman Test Bank

Campbell Biology 12th Edition Urry Cain Wasserman Test Bank CAMPBELL BIOLOGY — 12TH EDITION Enhanced Original Biology Study Guide & Practice Workbook Urry • Cain • Wasserman • Minorsky • Orr — concept review, high-yield comparisons, original questions Source basis: public Stuvia listing for the 1,240-page test-bank document, uploaded June 21, 2021 and written for 2020/2021. Its visible preview begins with Chapter 1 and covers cells, prokaryotes/eukaryotes, reductionism, biological organization, feedback, genes, gene expression, the genetic code, photosynthesis, common ancestry, taxonomy and phylogenetic trees. The broader 12th-edition chapter sequence spans chemistry, cells, genetics, evolution, diversity, plant/animal biology and ecology. Copyright note: This is an independently written study resource. It does not reproduce the paid test bank, its question wording, answer key, or hidden pages. Practice questions below are original. Original educational study guide • Not an official test bank Page 2 1. Master Course Map Unit Core ideas Exam emphasis 1. Chemistry of Life Atoms, bonding, water, carbon, macromolecules Structure → property → function 2. Cell Organelles, membranes, metabolism, respiration, photosynthesis, signaling, cell cycle Mechanism and prediction 3. Genetics Meiosis, Mendel, chromosomes, DNA, gene expression, regulation, viruses, biotechnology Inheritance and information flow 4. Evolution Natural selection, population genetics, speciation, history of life Evidence and population-level change 5. Diversity Phylogeny, bacteria/archaea, protists, plants, fungi Shared ancestry + adaptations 6. Plants Structure, transport, nutrition, reproduction, signaling Life-cycle and transport logic 7. Animals Form/function, nutrition, circulation, gas exchange, immunity, reproduction Homeostasis and systems 8. Ecology Populations, communities, ecosystems, conservation Energy, matter and interactions 2. Themes of Biology & Scientific Inquiry Core themes • Evolution: explains both unity and diversity of life. • Structure and function: biological form constrains and enables function. • Information: DNA stores heritable information; gene expression converts information into functional products. • Energy and matter: organisms transform energy and cycle matter. • Interactions: biological systems operate through networks of components and environments. • Emergent properties: interactions among parts can produce system-level properties not present in isolated components. Reductionism vs systems thinking Reductionism studies components to understand a larger system; systems thinking emphasizes interactions among components. Strong biology questions often require both approaches. Levels of organization Biosphere → ecosystem → community → population → organism → organ system → organ → tissue → cell → organelle → molecule → atom. Moving downward usually emphasizes components; moving upward emphasizes interactions and emergent properties. Feedback Negative feedback counteracts a deviation and stabilizes a system. Positive feedback amplifies a process until an endpoint is reached. A classic negative-feedback example is thermoregulation. 3. Chemistry of Life Atoms, bonds and polarity Valence electrons drive bonding behavior. Covalent bonds share electrons; ionic interactions arise from attraction between charged ions; hydrogen bonds are weaker attractions important for water and biomolecular structure. Molecular polarity influences solubility and interactions. Water • Cohesion contributes to surface tension and continuous water columns in plants. • Adhesion helps water interact with other surfaces. • High specific heat buffers temperature changes. • Evaporative cooling removes substantial heat. • Water's solvent properties arise from polarity and its ability to form hydrogen bonds. • Ice is less dense than liquid water because hydrogen bonding creates an open structure. Original educational study guide • Not an official test bank Page 3 pH and buffers pH is logarithmic. A one-unit decrease represents a tenfold increase in hydrogen-ion concentration. Buffers resist abrupt pH changes by accepting or donating H+ as conditions change. 4. Biological Macromolecules Macromolecule Building blocks Major functions Carbohydrates Monosaccharides Energy, storage, structural roles Lipids Not one repeating polymer; includes fatty acids/glycerol in many lipids Energy storage, membranes, signaling Proteins Amino acids Enzymes, transport, structure, signaling, defense Nucleic acids Nucleotides Information storage and transfer Structure matters: changing a molecule's shape or bonding can change its biological function. Protein folding depends on interactions among amino-acid side chains and the environment. 5. Cell Structure & Membranes Prokaryotic vs eukaryotic cells Feature Prokaryotic Eukaryotic Nucleus No membrane-bound nucleus Membrane-bound nucleus Membrane-bound organelles Absent Present DNA Usually nucleoid region; circular chromosome common Nuclear chromosomes; linear chromosomes common Examples Bacteria, Archaea Animals, plants, fungi, many protists Endomembrane system Nuclear envelope, ER, Golgi apparatus, lysosomes and related vesicles coordinate synthesis, modification, sorting and trafficking of many proteins and lipids. Membrane transport Mechanism Energy? Direction/idea Simple diffusion No direct ATP Down concentration/electrochemical gradient Facilitated diffusion No direct ATP Down gradient via protein Osmosis No direct ATP Water movement toward higher effective solute concentration Active transport Yes, directly or indirectly Against gradient Endocytosis/exocytosis Cellular energy required Bulk movement 6. Metabolism & Enzymes Metabolism includes all chemical reactions in an organism. Catabolic pathways break molecules down and often release usable energy; anabolic pathways build molecules and require energy. ATP and energy coupling ATP is an energy-transfer molecule. Hydrolysis can be coupled to reactions that would otherwise be unfavorable. The key exam idea is not that ATP is a long-term energy store, but that it transfers energy within cellular work. Enzymes • Lower activation energy; they do not change the overall ∆G of a reaction. • Do not get consumed as reactants in the reaction they catalyze. • Active-site shape and chemistry determine substrate interactions. Original educational study guide • Not an official test bank Page 4 • Temperature, pH and inhibitors can change enzyme activity. • Competitive inhibitors compete for the active site; noncompetitive/allosteric inhibition changes enzyme function without simply occupying the active site in the same way. 7. Cellular Respiration & Fermentation Overall logic: organic fuel is oxidized and energy is captured in ATP and reduced electron carriers. Glycolysis occurs in the cytosol. In eukaryotes, pyruvate oxidation and the citric acid cycle occur in the mitochondrial matrix; oxidative phosphorylation occurs at the inner mitochondrial membrane. Stage Location in eukaryotes Main role Glycolysis Cytosol Glucose → pyruvate; ATP and NADH produced Pyruvate oxidation Mitochondrial matrix Acetyl-CoA production; NADH Citric acid cycle Matrix Electron carriers + substrate-level ATP/GTP ETC + chemiosmosis Inner mitochondrial membrane Proton gradient drives ATP synthase Fermentation regenerates NAD+ so glycolysis can continue when oxidative phosphorylation cannot provide sufficient NAD+ regeneration. It does not produce the large ATP yield associated with aerobic respiration. 8. Photosynthesis Photosynthesis converts light energy into chemical energy. In chloroplasts, light reactions occur in thylakoid membranes; the Calvin cycle occurs in the stroma. Process Main location Key outcome Light reactions Thylakoid membrane ATP, NADPH; O2 released from water Calvin cycle Stroma Uses ATP/NADPH to build carbohydrate precursor A common trap is saying plants convert sunlight directly into glucose. The process involves multiple energy-transfer and carbon-fixation steps; light energy is first captured in electron-transfer systems. 9. Cell Signaling & Cell Cycle Signal pathway Reception → transduction → response. Ligand binding can change a receptor's conformation and trigger intracellular signaling cascades. Second messengers such as cAMP can amplify signals. Cell-cycle control G1, S, G2 and M are coordinated by checkpoints and regulatory proteins. DNA replication occurs during S phase. Mitosis separates duplicated chromosomes; cytokinesis divides the cytoplasm. Cancer connection Cancer can arise when regulation of cell division, DNA repair, apoptosis or signaling becomes abnormal. Proto-oncogenes can become oncogenes; tumor-suppressor pathways normally restrain inappropriate proliferation. 10. Genetics: Meiosis, Mendel & Chromosomes Mitosis generally produces genetically similar daughter cells; meiosis produces haploid cells and introduces genetic variation through crossing over, independent assortment and random fertilization. Concept What to remember Law of segregation Allele pairs separate during gamete formation Independent assortment Alleles of different genes can assort independently when loci are not linked in a way that prevents it Crossing over Exchange between homologous chromosomes during meiosis I Nondisjunction Failure of chromosome separation; can cause aneuploidy Original educational study guide • Not an official test bank Page 5 Concept What to remember Testcross Cross with homozygous recessive genotype to infer an unknown dominant phenotype's genotype Probability toolkit For independent events, multiply probabilities for an and condition and add probabilities for mutually exclusive or outcomes. Always define the event before calculating. 11. DNA → RNA → Protein DNA replication copies genetic information. During transcription, RNA polymerase synthesizes RNA from a DNA template. During translation, ribosomes use mRNA codons and tRNAs to assemble a polypeptide. Mutation logic • Silent mutation: may not alter the amino-acid sequence. • Missense mutation: changes one amino acid to another. • Nonsense mutation: creates a premature stop codon. • Frameshift: insertion/deletion not divisible by three changes the reading