Which of the following fatty acids would be likely to increase in concentration in the membrane of a bacterial cell switched from growth at 37ºC to growth at 15ºC? a. stearic acid b. oleic acid c. arachidic acid d. palmitoleic acid e. palmitic acid
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Which of the following fatty acids would be likely to increase in concentration in the membrane of a bacterial cell switched from growth at 37ºC to growth at 15ºC?
a. stearic acid
b. oleic acid
c. arachidic acid
d. palmitoleic acid
e. palmitic acid
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- Penicillin is an antibiotic. It kills bacteria by preventing the formation of the peptidoglycan layer of the bacterial cell wall. Penicillin does so by inhibiting the enzyme Transpeptidase, which is required for peptidoglycan layer formation. What type of inhibitor is Penicillin? Explain.Individuals who develop scurvy suffer from sore and bleeding gums and loss of teeth. Which of the following describes the mechanism by which the vitamin C they are lacking acts to prevent this disease? Question 79 options: a) As a matrix for the deposition of minerals such as calcium and phosphorus b) As a coenzyme involved in collagen biosynthesis c) As an enzyme involved in ligament formation d) As an antioxidant that prevents tissue damage from free radicalsList two differences you would expect to see in the composition of lipids in the E. coli membrane when the cells are incubated at 25 °C compared to incubation at 37 °C.
- If an organism tests positive for catalase, which of the following is MOST likely true about the organism? A. It returns nitrogen back to the atmosphere B. It can break down plasma membranes C. It creates H2O as a product of respiration D. It can only do homolactic fermentationYou combine 0.2 g of yeast, 0.2 g of sucrose and 10 mL of water, place the mixture inside an uninfl ated balloon, then tie off the opening of the balloon. (a) Explain what you would observe over the next hour. (b) What would you observe if you added iodoacetate to the mixture? (c) What would you observe if the mixture contained lactose rather than sucrose?What substance joins proteoglycans together into gigantic complexes called proteoglycan aggregates? These complexes can occupy very large volumes. a. hyaluronidase b. hyaluronic acid c. proteoglycase d. fibronectin e. laminin
- During cell respiration, what happens to the strength of the bonds between atoms in glucose vs those in the products water and carbon dioxide? Choose all answers that are correct. a. the carbon-hydrogen bonds in glucose are stronger than the carbon-oxygen bonds in carbon dioxide b. an oxidizing agent c.the carbon-hydrogen bonds in glucose are weaker than the carbon-oxygen bonds in carbon dioxide d.the carbon-hydrogen bonds in glucose are weaker than the oxygen-hydrogen bonds in water e.the carbon-hydrogen bonds in glucose are stronger than the oxygen-hydrogen bonds in waterIn fatty acid biosynthesis, where does the addition of unsaturation to the hydrocarbon tall occurs? A. cytosol B. ribosome C. Golgi apparatus D. endoplasmic reticulumCompound Sodium Lactate is isotonic solution. this mean that it a. reduces movement of sodium across the membrane b.prevent movement of water across the semi permerable cell membrane c. promotes movement of water out of the cell d. facilitates equal movement of water across the semi permerable cell membrane
- Chemiosmosis involves a. the movement of electrons across the cell membrane. b. the movement of hydrogen atoms across a mitochondrial membrane. c. the movement of hydrogen ions across a mitochondrial membrane. d. the movement of glucose through the cell membrane.One of the following is TRUE? A. The transport of Na+ across cell membranes depends solely on concentration gradient B. The transport of sucrose across cell membranes depends solely on concentration gradient C. The transport of K+ across cell membranes depends solely on concentration gradient D. The transport of Ca2+ across cell membranes depends solely on concentration gradient E. A & CCyanide makes a bond to cytochrome in the electron transport chain located in the mitochondria, rendering the electron transport chain useless. The cyanide ingestion in death due to which of the following? a) Starvation, due to an inability to create glucose.b) Build up of lactic acid.c) Inability to take in oxygen through the lungs.d) Cellular death from lack of energy.