Biology Questions

Many enzymes cannot recognize a stereoisomer of their substrate Some enzymes accept any of a whole group of substrates Carboxypeptidase recognizes any of the amino acids from the carboxyl end of a polypeptide Cells are often able to carry out metabolic activity with only a handful of enzymes because many are nonspecific Question 30 1 point 4 Listen Which of the following statements is false concerning the value AH OAH is the change in heat content A reaction with a positive AH value is exothermic OAH AE A PV In biology AH is basically the same as AE

as are placed in an aqueous solution The entropy of the phospholipids decreases and the entropy of the entire system also decreases The entropy of the phospholipids increases and the entropy of the entire system decreases O The entropy of the phospholipids decreases and the entropy of the entire system increases Question 38 1 point 4 Listen Under the conditions of a given reaction a positive AG means O the reaction is spontaneous Ono energy needs to be added the reaction is at equilibrium

When the AG of a chemical reaction is positive Keq 1 0 under standard conditions O reactants and products are at equilibrium products predominate over reactants reactants predominate over products None of the above

Which of the following is likely characteristic of pyruvate dehydrogenase ty of allosteric effectors both inhibitors and activators he complex that binds to Pyruvate dehydrogenase has at least two conformations an active form and an inactive form Pyruvate dehydrogenase is a large multisubunit protein The active conformation of pyruvate dehydrogenase likely has a higher affinity for substrates than does the inactive conformation All of the above Question 44 1 point 40 Listen Muscle contraction is an example of which of the following types of work O Heat Mechanical Electrical Concentration

S Km S Km both S Km and S Km Question 32 1 point 4 Listen The image shows a hypothetical enzymatic pathway with four enzymes labeled E1 E2 E3 and E4 The enzymes make products labeled PO P1 P2 P3 and P4 Which of the following statements is most likely to be true in the case of the feedback regulated enzymatic pathway shown OPO binds E4 and activates it OP2 binds E2 and activates it OP4 binds E1 and deactivates it

ving classes of enzymes Transferases Ligases Hydrolases Oxidoreductases Question 28 1 point 4 Listen A classical noncompetitive inhibitor will affect the Km Vmax of an enzymatic reaction

an endergonic system equilibrium an exergonic system the biochemical standard state for cellular reactions mosphere and a Question 42 1 point 4 Listen Succinylcholine is structurally similar to acetylcholine If succinylcholine combines with the enzyme that normally hydrolyzes acetylcholine the enzyme is no longer able to hydrolyze acetylcholine This suggests that Osuccinylcholine must be a noncompetitive inhibitor succinylcholine must be a competitive inhibitor with acetylcholine succinylcholine must be an allosteric regulator for this enzyme the activation energy barrier for succinylcholine hydrolysis is higher than that for

bind to the active site of an enzyme through noncovalent bonds are often toxic to cells have only a temporary effect on enzyme activity are not active against ribozymes Question 24 1 point Listen An enzyme is active in the stomach of an animal but quickly loses its activity when it leaves the stomach This example illustrates that enzymes are Odigested in the small intestine O consumed by the quantities of substrate in the small intestine inactivated by movement

Enzyme enegry Entropy Activation energy O Substrate energy Question 34 1 point 1 Listen Consider a situation in which the enzyme is operating at optimum temperature an pH and has been saturated with substrate What is your best option for increasin the rate of the reaction Increase the pH O Increase the temperature Increase the substrate concentration nonyme concentration

enzymes do not function as well at temperatures other than the optimal temperature bacteria reproduce more rapidly at higher body temperature sweating removes prosthetic groups from biological enzymes the higher temperature increases the activity of lyases Question 26 1 point Listen because 1 The equation AB H2O A B would be catalyzed by which of the following classes of enzymes O Oxidoreductases Transferases Hydrolases

All animals are made of cells All organisms are made of many cells Cells arise spontaneously from organic matter O Viruses exist independently of cells Question 20 1 point Listen CRISPR technique is used for separating proteins from mixtures O separating DNA from mixtures O genome editing testing rodent social behavior

separating DNA from mixtures genome editing testing rodent social behavior Question 21 1 point 4 Listen The limit of resolution can best be defined as O the distance that two objects must be apart to be distinguished as separate objects the magnification power of a microscope the inverse of the wavelength of light it is greatest for black light the distance that an object must be moved to be distinguished from its background

Fatty acids Steroids Chaperones Polypeptides Question 18 1 point 4 Listen The complete folding of polypeptides into proteins can be attributed to which of the following O electrostatic interactions hydrogen bonds hydrophobic clustering All of the other answer choices identify forces that can affect the folding pattern

Monomers are removed from polymers by condensation hydrolysis O substitution neutralization reactions

ter spread on the surface of the moon what effect would it have temperature If we could keep a layer Because water has a high heat of vaporization the temperatures would rise to the upper extremes Physical conditions would remain the same Water would absorb and hold heat and moderate the temperature extremes The temperatures would drop to the lower extremes Question 8 1 point Listen Why do ionic substances such as NaCl dissolve so readily in water The sodium ions repel the negative end of the water molecule lonic substances do not dissolve in water The charged ends of the water molecules are able to surround the oppositely charged salt ion

After shaking the vinegar and oil levels separate based upon polarity and density To this you add glucose and sodium citrate and shake again Where do you expect to find the glucose and sodium citrate in greatest quantities Both will concentrate in the vinegar layer Both will be uniform throughout both layers Sodium citrate will concentrate in the vinegar glucose in the oil The glucose will concentrate in the vinegar sodium citrate in the oil Question 10 1 point Listen How do large polar and charged molecules cross biological membranes O They cross biological membranes via transport proteins that form hydrophilic channels through the membrane Large polar and charged molecules can t cross biological membranes They must be hydrolyzed before they can cross a biological membrane logical membranes via diffusion through the hydrophilic core of

Bond energy is directly proportional to bond stability such that the more stable a bond is the more energy will be required to break it There is no relationship between bond energy and bond stability Bond energy is inversely proportional to bond stability such that the more stable a bond is the less energy will be required to break it Bond energy is inversely proportional to bond stability such that the more stable a bond is the less energy will be required to break it Question 16 1 point 4 Listen Water is an excellent solvent for Olipids Ohydrocarbons membrane proteins

4 Question 14 1 point 40Listen The electron microscope has much better resolving power than the light microscope because living samples are used in electron microscopy the wavelength of the electron beam is much shorter than the wavelengths of visible light tron microscope uses UV fluorescence

ressed You would be studying the macrophage information O amplicon genome transcriptome metabolome to obtain this Question 6 1 point 4 Listen Which of the following is not a fundamental property of carbon Carbon containing molecules are diverse Carbon containing molecules may form stereoisomers Carbon atoms are most likely to form ionic bonds with one another

Glucose 6 phosphate Adenosine triphosphate Amino acid Aminoacyl tRNA Question 12 1 point Listen Which of the following is an informational macromolecule ODNA ATP O Starch Glycogen

sample would be centrifugation chromatography polyacrylamide gel electrophoresis agarose gel electrophoresis cells The best way Question 4 1 point 4 Listen Which of the following biochemical techniques uses an electrical field to separate macromolecules based on their mobility through a semisolid gel Ultracentrifugation Light microscopy

Ribosome Virus Mitochondrion Protein Question 2 1 point 1 Listen Which of the following is an application of immunofluorescence microscopy Visualization of the surface structures of a specimen Construction of three dimensional images of structures smaller than 10 nm Identification of specific components of the immune system ch organelle or cellular compartment contains a particular p

Consider the image below solute particle In this situation which of the following will occur Water will flow out of the cell in a process called crenation Water will flow into the cell in a process called hemolysis There will be no net water flow

solute particle In this situation which of the following will occur Water will flow out of the cell in a process called crenation Water will flow into the cell in a process called hemolysis There will be no net water flow

1 What is the purpose of phosphorylation and dephosphorylation and what is the difference between the two

Why is a standard state necessary in biochemistry and all of science

ARE VI Venn Diagram Activity Part A Use the word bank to complete the Venn diagram to comparing living things and viruses WORD BANK contains genetic material uses a host to reproduce evolves quickly contains a capsid LIVING THINGS Fmaintains Momeostasis maintain homeostasis has a cell membrane responds to Stimuli evolves can thermoregulate has cell organization has cell organize Fuses a host to reproduce COMMONALITIES responds to stimuli reproduces grows and develops consumes nutrients for energy VIRUSES

Why should biological cells not be in a state of equilibrium

Write the systematic IUPAC name for each of the following organic molecules structure OH T CH3 CH2 CH2 CH CH2 CH CH2 C CH CH3 CH3 CH3 OH CH3 CH CH3 CH3 CH3 CH CH2 CH CH2 CH2CH2CCH3 OH CH3 HO CH2 C C CH3 CH3 CH3 OH CH3 name 0 0 0

Draw the skeletal line structure of dipropyl ether

Write the common not systematic name of each organic molecul Hint your answer should have more than one word structure CH3 CH2 CH2 O CH2 CH2 CH3 CH3 CH O CH CH3 name 0 0 X S

raw the skeletal line structure of 7 9 dimethyl 3 decanol

Add a methyl substituent at position 2 and a methoxy substituent at position 3 to this organic molecule Make sure to use the same condensed drawing style when adding your substituents

Add a methyl substituent at position 2 and an isopropoxy substituent at position 4 to this organic molecule Make sure to use the same skeletal drawing style when adding your substituents

a b C Question How do acids and bases affect the reaction rate of an enzyme 2 The graph to the right shows the optimum pH for the enzyme catalase Remember that Acids have a pH of 1 6 9 and bases have a pH of 7 1 14 1 What is the optimum pH for this enzyme Hypothesis The following terms can be used to fill in the blanks below Terms may be used once more than once or not at all acidic basic speed up slow down 1 If we make the solution more acidic than water then the catalase reaction will Experiment Materials If we make the solution more basic than water then the catalase reaction will 3 reactions vials 3 cubes of potatoes exact same size crushed increasing enzyme activity Water Acetic acid vinegar Water sink Baking soda solution 5 6 optimum pH 7 pH Measured Measured height of the bubbles pH 8 Hydrogen peroxide Food coloring and dish soap to see the bubbles more easily Procedure 2 1 Obtain 3 reaction vials and 3 cubes of crushed potato Put the potato cubes in the vials Measure the pH of the vinegar water and baking soda with pH paper Record the values in the data table below 3 Add one to each of the three separate vials Pour just enough to cover the potato cube Acetic acid vinegar 9 10 4 Get approximately 30 ml of hydrogen peroxide in a beaker and add food coloring and dish soap a couple drops each 5 Pour 10 ml in each of the 3 reaction vials as quickly as you can and start a timer Mark the beginning height of the solution on each of the vials Environmental condition Acid vinegar Water Base baking soda solution Dispose of your waste and return the reaction vials and beakers where you found them 6 After 5 minutes mark the final height of the bubbles for each reaction on each of the vials 7 Calculate the difference in height for each of the reactions and record your data in the table below

This connective tissue looks like strands of wavy hair It is very strong and attaches muscles to bones Dense Regular Collagenous

Trace the path of water flow through a leuconoid sponge 4 7 osculum 3 flagellated chamber 4 prosopyle 6 apopyle 1 ostia excurrent canal 5

Which of the following classes of sponges have siliceous spicules Select all that apply Hexactinellida Calcarea Homoscleromorpha

Match the cell type to the correct function prey capture in ctenophores feeding in mollusks equilibrium detection buoyancy control in mollusks prey capture and defense in cnidarians osmoregulation in flatworms movement of water through sponges 1 choanocyte 2 cnidocyte 3 colloblasts 4 flame cells 5 siphuncle 6 radula 7 statocyst

Trace the path of water flow through a leuconoid sponge osculum flagellated chamber prosopyle apopyle ostia excurrent canal

25 When sharing the road with large trucks other drivers should NO ZONE NO ZONE NO ZONE Never travel in a No Zone Zone NO ZONE Quickly and safely move through any No

24 Looking at the diagram which vehicles are required to stop for the school bus red on a multiple lane road divided by a physical barrier Divided Highway w Barrier A B CO D

23 Any use of a cell phone while operating a motor vehicle is considered a distraction because EYES ON THE ROAD NOT ON YOUR PHONE LOOK ALIVE It causes the driver to be concerned about the cost of the call It occupies the driver s hands eyes and mind It draws the attention of other drivers as it is

drivers because ing poses special The speed limit is increased at night There are fewer cars on the roads at night

Question 2 of 25 2 If you approach a flashing red traffic light you O O sign C Are traveling in the wrong direction Must treat the intersection the same as a stop

Another name for a 4 way intersection An area designated for road construction workers

Question 24 of 25 24 All drivers under the age of 21 have a specific restriction prohibiting them from Driving or attempting to drive while smoking Driving or attempting to drive before midnight Driving or attempting to drive after consuming alcohol

22 Looking at the diagram which vehicles are required to stop for the school bus red on a two lane road A B CO

Neth Cellular respiration H O NADH Oxygen in H NADH Pynner 000 000 Krebs cyde ATP CO Oxidative phosphorylation Cytoplasm FADH and NADH Outer mitochondrial membrane trix Intermembrane space 415 Match each of these steps in respiration with the reduced product s formed in each case In other words what molecule ends up with the electrons after each step Drag each item on the left to its matching item on the right Inner mitochondrial membrane Matrix glycolysis oxidative phosphorylation lo Question I know You can g 100 points Acti View Ac 1 Cur 1 Yous been Questic

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