- Task#1 Write and learn basic definitions : Cell Cytology Cytoplasm Inclusions Organelles Plasmalemma Specialized organelles Single membrane-bound organelles Double membrane-bound organelles
- functional enzyme together with its cofactors is called: loenzyme poenzyme oenzyme ostheric enzyme ith regards to the Michaelis-Menten equation, a molecule that has the effect of increasing the nax of a reaction upon binding to an enzyme would be called what? tivator competitive inhibitor n-competitive inhibitor mpetitive inhibitor nich statement is true of enzymes? zymes work independent of substrate concentration. e activity of an enzyme might change as pH changes. anges in temperature do not affect enzymes. zymes catalyze chemical reactions by increasing the activation energy. at is true of an uncompetitive inhibitor? inds only to the complex formed between the enzyme and the substrate educes the activity of the enzyme and binds equally well to the enzyme whether or not it has eady bound the substrate orms the same products as the substrate. inds to the active site of the enzyme. lat is true of a competitive inhibitor? as a structure similar to the substrate. as the same mass as the substrate. orms the same products as the substrate. inds with the enzyme in a place other than the active site of the enzyme. w would a fever most likely affect the activity of enzymes in human body? rould cause the enzyme to adapt to the new temperature. ould slow or stop enzyme function. ill change the amino acid sequence of the enzyme. ould increase enzyme activity. at will happen with the amount of the enzyme after biochemical reaction: amount of the enzyme will always reduce e amount of the enzyme will never reduce e amount of the enzyme will reduce in catabolic reactions e amount of the enzyme will reduce in anabolic reactions te down and explain Michaelis-Menten equation
- 7. The active site model (also called the lock and key model) of enzyme -ubstrate binding differs from the induced fit model in which of the following ways? A. The induced fit model holds that the shape of the substrate is irrelevant to enzyme substrate binding B. The induced fit model holds that the shape of the active site is altered during the course of substrate binding C. The induced fit model holds that the shape of the active site is permanently altered by substrate binding D. The induced fit model holds that enzyme-substrate binding does not take place at the enzyme's active site 8. Which of the following enzyme types catalyzes the formation of a single bond between two substrates? A. Ligase B Oxidoreductase c . Isomerase D . Hydrolase 9. Enzymes undergo a decrease in catalytic efficiency in the presence of excess temperature but can regain this efficiency once temperature returns to normal: this suggests that increased temperature does not disrupt which of the following aspects of enzym structure? A. Peptide bonds B. Vander Waal's forces C . Hydrophobi c interactions D . Hydrogen bonds 10. Local conditions can affect the specificity of an enzyme for its substrate and thus the enzymes catalytic ability: which of the following alterations would most likely not affect an enzyme in this manner? A. Increased temperature B . Increased concentration of H+ C Increased substrate concentration D . Increased concentration of salts 11. Enzymes catalyze biochemical reactions by altering which of the following quantities associated with the reaction? A. The change in Gibb's free energy Delta G B. The equilibriun constant k_(eq) C. The enthalpy of formation Delta H D. The activation energy E_(a) 12 . Potassium cyanide is a poison which combines with cytochrome to prevent binding of oxygen to the enzyme without altering the Km of the reaction with respect to reduced cytochrome c . Which type of inhibitior does this represent? A Noncompetitive inhibition B . Reversible inhibition C . Competitive inhibition 13.In the first step of glycolysis hexokinase produces glucose-phosphate G-6-P itself can also bind to hexokinase at th e active site,blocking access to ATP. This is an example of: A . Allosteric inhibition B Feedback inhibition C Uncompetitive inhibition
- Mesaholism V constanced with infraved thermome of 36 D 3. Before commoring amino acids into intermediates for energy metabolism, they must st first undorgo __ denit A wiglycerides to gly cetol and fatty acids is called __ A. trigh-vivily vis B. glycu D. linety is E used to __ the maintenance of blood glucose B conver glucuse to amino acids convert theose to falls D finel the activity of that muscle exclusively E both fuct music activity and maintain blood glucose 6 What is ant increase in body temperature to greater-than-normal levels called? A. condustion B. comision c hypothermia D. hyperthermia E 7. What is person's metabolic rate delined as? The rate: by their body by their body during "absolute rest" (onsume oxygen D. At which they produce heat 8. A 27-year-old man is thrown from a raft while whitewater rafting in Colorado in May. He is in the water for 2 minutes.The water temperature is 35^circ F Which of the following mechanisms helps to maintain his core temperature while he help? A. Cutanoves visudilation B. Divin :ilex C. Increased thermore set point D. Inhibition of catecholamine release E. Shivering
- 1. What is true of a competitive inhibitor? A. It has the same mass as the substrate. B. It has a structure similar to the substrate. C. It forms the same products as the substrate. 2. The active site of an enzyme E, which catalyzes a reaction X, is partially following quantities associated with X is most likely to be affected by th E compared to the native form of E? A. the constant k_(b) B. the heat of reaction Delta H C. the rate-constant k D. the equilibrium constant k_(eq) 3. Which of the following enzyme types catalyzes the formation of a single b substrates? A. Ligase B - Oxidoreductase C. Isomerase D. Hydrolase 4. Enzymes undergo a decrease in efficiency in the presence of exces regain this efficiency once temperature returns to normal this suggests that does not disrupt which of the following aspects of enzyme structure? A. Peptide bonds B. Van der Waal's forces C. Hydrophobic interactions D. Hydrogen bonds 5. Local conditions can affect the specificity of an enzyme for its substrate, and catalytic ability :which of the alterations would most likely not affe manner? A. Increased temperature Increased concentration of H+ Increased substrate concentration Increased concentration of salts Pancreatic amylase is a digestive enzyme found in the small intestine. It helps starch molecules later in the digestive process . Pancreatic amylase is unable to Lipids are too hydrophobic to be broken down by enzymes. Lipids are too small to bind to enzymes. Enzymes bind only to their specific substrates. Enzymes denature in the presence of lipids. hich of the following molecules cannot be classified as an enzymatic cofactor? line AD (Flavine adenine Dinucleotide) Variant 2
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