Department of Biology | College of Arts and Sciences
BIL 360 - Study Guide for Exam 2 This is not a substitute for reading your text or your notes. Anything said in class or in the assigned readings is fair game. This study guide is just a checklist. Use it wisely. As always, be able to read figures and tables competently.Nutrition, Feeding and Digestion (Chapter 6 - Lecture 6b)Recall the definitions of: herbivoreheterotrophprimary consumercarnivoreautotrophsecondary consumeromnivoreprimary produceretc. (If you don’t’ remember…Google it.)Know the definitions of: frugivore, granivore, insectivore, coprophageKnow the basic mechanisms of: suction feedingprotrusion feedinggill rakers in suspension feeding fishlunge feedingsimple suspension feedingram feedingfilter feedingUnderstand how predation has resulted in the evolutionary adaptations for procurement of food and for avoiding becoming food.Know the precise definitions of: poison, toxin, venom.Understand what is meant by the terms: nutrition, feeding, digestion, absorption/assimilation and how they are interrelated.Know the definitions of: poison, toxin, venom. (Which term is most inclusive? Least inclusive?)Know the meaning/significance of endotoxin vs. exotoxin, and be able to recognize examples of each.Know the meaning/significance/functions ofcytotoxinhemotoxin(which of the toxin types includes all the others?)phospholipasemyotoxinKnow the general effects of each type of toxin.Know the meaning/significance/functions ofneurotoxinneurotoxins(which of the toxin types includes all the others?)fasciculinsbotulinum toxins Know the general effects of each type of toxin.dendrotoxinstetanus toxin(Functional difference btw botulinum & tetanus toxins?)(To which of these toxins is capsaicin an antagonist?)Be able to recognize examples of animals that use each of these types of toxins and the structures they use to deliver venom (e.g. modified radula of cone snail; fangs of spider, viper, etc.)Be able to recognize examples of heterotroph, photoautotroph, and chemoautotroph microbe symbioses.If you don’t remember the different types of symbiosis from BIL 160, BE SURE to review them here: the functions and benefits of the symbiotic microbiome.Know the meaning/significance ofmetagenomezooxanthellaeFeeding (Chapter 6 - Lecture 6c)Know the difference between an incomplete and a complete digestive tract. Which is more derived?Know the meaning/significance ofblastoporeendodermentericabsorptionarchenterongastricdigestionKnow the anatomical divisions of the gastrointestinal tract (GIT): headgutforegutmidguthindgutKnow which structures are derived from each of the above, and the functions of each:lipsesophagussmall intestinemouthstomachlarge intestinetonguecrop(Know which types of animals have these structures/organs)pharynxgizzard(e.g., mammals have lips; birds & some reptiles have gizzards, etc.)Know the anatomical differences between the gut of an herbivore vs. that of an omnivore or carnivore.Understand the specializations of the headgut that allow different types of animals to procure food.Be familiar with the dental specializations of various species of animals.Know how to interpret (or create) a dental formula for a mammal.Know the meaning/significance of: diphyodont homodontdeciduous teethincisorspremolarsfangsheterodont hypsodontpermanent teethcaninesmolarsrear fangsBe familiar with the general morphology of bird bills, and how bill shape has evolved with diet.Know the functions and relative positions of the components of the foregut: Esophagusstomachpancreaspyloric sphincterCropproximal duodenumliverGizzardgallbladdercardiac sphincterKnow the functions and relative positions of the components of the midgut: distal duodenumcaecumtransverse colon (first ~65% is midgut-derived)jejunumappendixileumascending colonKnow the functions and relative positions of the components of the midgut: transverse colon (last ~35%)sigmoid colonproximal anus or cloacadescending colonrectum(distal anus/cloaca are partly integumentary)Understand the basic anatomical/developmental differences between the arthropod and vertebrate GIT.What are Malpighian tubules and what is their function?What is a cloaca, and how does it differ from an anus?Is your Chemistry study guide this embarrassing?Know the meaning/significance of: gut motilitysegmentationdysbiosis (intestinal, cecal, etc.)peristalsisileus(What generates each of these? Which muscles involved?)Know which types of animals guts are analogous to a batch reactor, a continuous flow reactor (no mixing), continuous flow reactor (with mixing)Know the meaning/significance of:monogastricenzymatic digestion(Which does which?)ruminant microbial fermentationKnow the difference between foregut, midgut, and hindgut fermenters, and recognize examples of each.In foregut fermenters, know the basic difference between animals with four-chambered stomachs vs. those with two- or three-chambered stomachs.Know the path of food in the stomach of a ruminant. What is the significance of the rumen microbiome? What does it do? What is the general anatomy and function of each chamber:rumenreticulumomasumabomasumKnow the meaning/significance ofchymosinpepsinlipasesrennetUnderstand the process of rumination (“chewing cud”) (EEeeuuuuuw)What is the significance of the human chymosin pseudogene?Understand the basic biochemistry of cellulose and hemicellulose fermentation (which is what the whole four-chambered stomach thing is all about). Know the meaning/significance ofShort-chain fatty acids (a.k.a. volatile fatty acids)e.g. – acetic acid, propionic acid, butyric acidHow are ruminants and anthropogenic climate change interrelated? What gases are involved? How does diet affect gas output?Understand the basic process of Urea Nitrogen Salvaging (UNS) via the Urea Cycle. (Don’t memorize the cycle!)Be able to recognize examples of midgut fermenters and understand the significance of their microbiomes.Know what is meant by the following terms regarding digestive enzymes: intraluminalamylasechitinasechymotrypsinmembrane-associated lactasepeptidasesendopeptidases vs. exopeptidasesproenzymes/zymogenslipasepepsinintracellularemulsificationtrypsinKnow the meaning/significance/role in digestion of: extracellular absorptionenterocyte(How are polar vs. non-polar nutrients absorbed?)intestinal villigoblet cellchylomicrons, immune system cells (Paneth cells, M cells, dendritic cells, Peyer’s Patch)Understand the roles of G cellssecretingastric inhibitory polypeptideleptingastrincholecystokininghrelinUnderstand the various ways feeding/digestion mechanisms in animals responding to hunger signals, satiety signals, seasonal changes, etc.Energy Metabolism (Chapter 7 – Lecture 7)Recall the Second Law of Thermodynamics, and how it applies to energy metabolism in animals. Be able to recognize animal-related examples of potential and kinetic energy.Know the meaning/significance/differences between chemical, electrical, mechanical energies, and heat.Know the meaning/significance ofmetabolic rate (and the ways it can be measured)Standard Metabolic Rate (SMR)thermoneutral zoneRoutine Metabolic Rate (RMR)basal metabolic rate (BMR)(Which measures are used for which types of animals?)Know the definitions of: endotherm vs ectothermhomeotherm vs. poikilothermRecall the definitions of: calorie, Calorie (kilocalorie), JouleUnderstand the concepts of metabolic scaling and weight-specific BMR.Understand how the allometric equation can be applied to metabolic scaling. What types of physiological functions scale allometrically?How can metabolic scaling be applied to ecological problems?Understand the general ways that metabolic rate can be measured.(e.g., calorimetry, respirometry, material balance)Which are direct measures? Which are indirect measures?Does diet affect these measures? How? Which type of nutrient has an R value of 1.0, and what does this mean to measurements if diet components have an R value < 1.0?Know the meaning/significance of specific dynamic action (SDA) and Diet-Induced Thermogenesis (DIT). What are some possible causes of SDA and DIT?How and why can these vary within and among species?Understand how energy absorption efficiency varies among species, and depends on what the animal is eating.When is growth efficiency greatest during an animals’ life cycle? Aerobic and Anaerobic Metabolism (Chapter 8 – Lecture 8)Recall the steps of aerobic catabolism (glycolysis, Krebs Cycle, electron transport, oxidative phosphorylation), but you don’t have to memorize those cycles again. Just know what’s happening.Know the meaning/characteristics of: steady state vs. nonsteady state mechanisms of ATP production.Be able to recognize examples of each.Understand the purpose and general course of the phosphagen system:phosphagens (creatine phosphate, arginine phosphate, lombricine, etc)phosphocreatinephosphagen kinasescreatinineWhat is the relationship between phosphagens and ATP?Understand the role of myoglobin for ATP production in low oxygen conditions.How are diving mammals able to survive such long, deep dives? What is special about their myoglobins?Know the differences between aerobic vs. anaerobic mechanisms of ATP production in terms ofATP yieldpeak rate of ATP productionATP production acceleration recovery timeRecall the molecular mechanisms of muscle contraction. (Watch the video!)Understand the various causes of muscle fatigue. Know the meaning/significance of: muscle fatigueendurance exercise fatiguelactic acid fatiguehyperthermia fatigue.Understand the differences between slow oxidative (SO) and fast glycolytic (FG) muscle fibers. Where would you expect to find each type? What is the difference between white muscle and red muscle?Understand the basic mechanism of insect flight and why it is so energy efficient.Understand the concepts of: maximal exercisesupramaximal exerciseoxygen deficitpay-as-you-go phase, submaximal exerciseexcess postexercise oxygen consumption (EPOC)Understand how, as oxygen levels fluctuate, animals undergo oxygen regulation or oxygen conformity.How do species with different evolutionary histories cope with hypoxic or anoxic conditions?What is the range of tolerance?Understand the reason for altitude sickness. Does being very fit affect your risk of altitude sickness?Understand the various mechanisms by which different species respond to hypoxic or anaerobic conditions.What unusual metabolic pathway is used by cyprinid fish in hypoxic conditions? (*hic*)Thermal Relations : General Concepts (Chapter 10 – Lecture 9a)Don’t forget the definitions of: poikilotherm vs. homeothermendotherm vs. ectothermKnow the meaning/significance of thermoregulator vs. thermoconformerUnderstand how the Second Law of Thermodynamics applies to heat transfer between living and non-living objects. Understand the difference and relationship between heat and temperature.Understand the meaning/significance of: Circadian cyclehibernationTorporaestivation(and be able to recognize examples of each)Know the meaning/significance of temporal heterothermybehavioral thermoregulationzoonosisregional heterothermyflight-induced hyperthermia in bats (significance to humans?)Are mammals ever poikilothermic? Under what conditions?Know the meaning/thermal significance of: thermal radiationconductionheat sinksolar irradianceconvectionevaporationsolar radiationinsolationKnow the meaning/thermal significance of: rate of conductive heat transferLatent heat of vaporizationrate of convective heat transfer(Don’t memorize equations, but recognize their components)Know how to apply Fourier’s Law to a described situation. (It’s open book, so you need not memorize any equations, including this one. Just know how to use it.)Know how to calculate a rate of convective heat transfer (with the equation in the notes). ................
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