Biology 1201 exam 2 - Study guides, Class notes & Summaries

why are membranes called phospholipid bilayers? - ANSWER phospholipids have hydrophilic head and hydrophobic tail, hydrophobic face inside of cell making 2 layers what is meant by fluid mosaic? - ANSWER Mosaic of proteins drifting laterally in fluid bilayer of phospholipids how are membranes adjusted for different temperatures? - ANSWER membrane fluidity adjusted by changing the ratio of unsaturated to saturated fatty acids how do the relative amounts of saturated and unsaturated fats chan...

SJ Singer and G Nicolson - 1972- proposed that membrane proteins are dispersed, individually inserted into phospholipid bilayer with their hydrophilic regions protruding Fluid Mosaic Model - -behaves like liquid -contains numerous diff. types of proteins -not held in one place, constantly moving Proteins - embedded in the membrane need to have amino acids that interact with water/ repel water to be inside the membrane Membrane Fluidity - -membranes are locked in place -held together by h...

Biology 1201 LSU Exam 2: Pomarico Latest Version Graded A+ macromolecules large organic molecules which are usually polymers polymers large molecules consisting of many identical or similar subunits monomer subunit of a polymer most biological polymerization reactions are_____ condensation reactions aka dehydration synthesis reactions condensation reactions (dehydration synthesis) polymerization reactions in which the covalent linkage of the monomers is accompanies by removal...

Biology 1201 LSU Exam 2 Questions and Answers 100% Pass What type of chemical reaction is without outside energy? Spontaneous (exergonic/downhill) NOT INSTANTANEOUS -decreasing enthalpy and increasing entropy What is the equation for Free Energy? deltaG=deltaH-TdeltaS -free enrgy=enthalpy-(temp.)(entropy;disorder) -high deltaS=low delta G Entropy Disorder: -breakdown: increase in disorder, more parts -synthesis: decrease in disorder, less parts -high entropy=low free energy ...

Exam 3: BIO1201/ BIO 1201 (Latest 2024/ 2025 Update) | Questions and Verified Answers| 100% Correct| Grade A – LSU Q: How are genes coordinately controlled in eukaryotic cells? Coordinately controlled genes in eukaryotic cells share a set of control elements. Coordinately controlled genes in eukaryotic cells are activated by the same chemical signals. Coordinately controlled genes in eukaryotic cells are located together on the same chromosome. Answer: Coordinately controlled...

Exam 2: BIO1201/ BIO 1201 Study Guide (Latest 2024/ 2025 Update) | Questions and Verified Answers| 100% Correct| Grade A – LSU Q: transport proteins allow passage of hydrophilic substances across the membrane Q: carrier proteins Answer: bind to molecules and change shape to shuttle them across the membrane Q: passive transport Answer: the diffusion of a substance across a membrane with no energy investment Q: Diffusuion Answer: Spreading out of partic...

Biology 1201 Final Exam Moroney LSU Questions and Answers Graded A+ An element has 8 protons, 9 neutrons, and 8 electrons. What are its atomic number and mass? 8 and 17 How many and what type of bonds does sulfur usually form in biology? 2 covalent A molecule that has all non polar covalent bonds would be________. hydrophobic What substance makes up the interior of a potato tuber? starch What is an example of a lipid? triglyceride One characteristic shared by sucrose, lactose, and maltos...

Exam 2: BIO1201/ BIO 1201 Review (Latest 2024/ 2025 Update) | Questions and Verified Answers| 100% Correct| Grade A – LSU Q: what is active transport? Answer: work must me done; must use supplied energy; employs carrier molecule Q: for which transport processes are carrier molecules involved? Answer: facilitated diffusion and active transport Q: which transport processes require the input of additional energy? Answer: active transport Q: what is a semi...

Biology 1201 LSU Exam 2 Questions and answers latest update

Biology 1201 Exam 3 with Certified Solutions One gene-one enzyme hypothesis (figure 17.2) genes code for enzymes Flow of information from DNA to RNA to protein (figure 17.3 and 17.4) DNA --- [transcription]---> mRNA ---[translation]---> Poypeptide RNA structure versus DNA structure (figure 5.26) deoxyribose is replaced by the 5 carbon sugar, ribose in DNA, the pyrimidines are C and T in RNA, the pyrimidines are C and U; in RNA, U pairs with A Transcription, RNA polymeras...