Exam 3 Bio Flashcards
(31 cards)
In bacteria, the transport of many nutrients including sugars in amino acids, is driven by the electro chemical H plus gradient across the plasma membrane. In E. coli for example, an H plus lactose symporter mediate the active transport of the sugar lactose into the cell. Given what you know about couples transport, which is likely true of the H plus lactose symporter.
If the H plus gradient were reversed, the transporter could serve as an H plus lactose anti-Porter
The resting membrane potential of animal cells
Results from K plus leak channels allowing K plus ions to flow out of the cell
When I transporter moves to solids in opposite directions across a membrane, it is considered an
Anti-Porter
A hungry so lands in a vase of grape juice and begins to feed on the sugars they are producing carbon dioxide and ethanol in the process. Which of the following could account for the yeast cells demise?
Inability to import sugar into the cell
Both transporters and channels allow hydrophilic solutes to pass across membranes. However unlike transporters, channels have
A higher rate of passage
The epithelial cells that line the gut have glucose NAplus symport proteins that actively take up glucose from the lumen of the gut after a meal, creating a high glucose concentration in the cytosol. How did the cells release that gluclose for use by other tissues in the body
The sales have glucose uniports in their plasma membrane
An animal cells, the N8 plus K plus pump moves. The cell
Three NA plus ions out of and 2 Kplus ions into
In auditory hair cells, a linking film it connects the stress gated channels of one stereocilia bundle to the next. What abnormal effect is expected to occur if those linking filaments are broken?
The channels will be closed when the bundles tilt
Both expository and inhibitory neurons form junctions with muscles. Inhibitory neurotransmitter is prevent the postsynaptic cell from firing an action potential by
Reducing the resting membrane potential
The advantage to the sale of the gradual oxidation of glucose during cellular respiration compared with us combustion to CO2 and H2O in a single step is that
Energy can be extracted and usable amounts
Fermentation
Can be sustained without using oxygen
During glycolysis, the enzyme GH3 phosphate dehydrogenase remove the proton and two electrons from its substrate. Which molecule is the recipient of the proton and two electrons during this transfer
NAD plus
In anaerobic conditions, skeletal muscle produces
Lactate only
When glucose is being used up and not replaced from food and take, the blood sugar level can be maintained by synthesizing glucose from smaller molecules such as pyruvate or lactate. This process is called glycogenesis. Which organ is principally responsible for supplying glucose to the rest of the body when glucose reserves are low
The liver
Fatty acids can easily be used to generate energy for the cell. Which of the following fatty acids will yield more energy? Think about which one holds the most potential energy and it’s bonds
Longest with all sungle bonds
As one oxaloacetate Molecule reacts with a acetyl co a and eventually regenerated, which of the following is produced
2co2 3 nadh 1 fadh2 1 gtp
Step three and glycolysis requires the activity of Phosphofructokinase to convert fructose six phosphate into fructose 16 by Phosphate. How is the activity of this enzyme regulated through allosteric control
ATP inhibits phosphofructokinase
Which of the following polymers of glucose is used as a way to store energy reserves and animal cells
Glycogen
Substrate level phosphorylation reactions
Produces all the ATP from glycolysis
Which of the following statement describes the phosphorylation event that occurs during oxidative phosphorylation
Inorganic phosphate is added to ADP
Where are the proteins of the electron transport chain located in. Chloroplast
Thylakoid membrane
Which of the following statements describes the phosphorylation event that occurs during oxidative phosphorylation
Inorganic phosphate is added to ADP
Where are the proteins of the electron transport chain located in chloroplast
Thylakoid membrane
If cells were exposed to a chemical agent that causes the inner mitochondrial membrane to become freely permeable to protons, which of the following affects would you expect to observe
The ratio of ATP to ADP in the cytoplasm would fall
