transport articles
What is the term for the delicate internal balance that the cell membrane's regulation ensures is maintained?
How do phospholipids spontaneously arrange themselves in an aqueous environment due to their amphipathic nature?
What fundamental energy input is required for passive transport processes?
Which molecules typically cross the lipid bilayer directly through simple diffusion?
What occurs when a cell is placed in a hypertonic solution?
Why do essential substances like sugars and amino acids often require facilitated diffusion?
What mechanism do channel proteins utilize to move specific ions across the membrane quickly?
What phenomenon limits the transport rate in facilitated diffusion if the concentration of the transported substance becomes extremely high?
What is the direct energy source coupled to the movement of a substance against its gradient in primary active transport?
According to the stoichiometry of the sodium-potassium pump, how many ions of each type are moved per ATP molecule used?
In secondary active transport (co-transport), what is the source of energy driving the uphill movement of one substance?
What is the core observation relied upon by the transit method?
What is the precise measurement of light intensity used in transit detection called?
What shape characterizes a successful transit detection in a light curve?
For an Earth-sized planet transiting a Sun-like star, what is the approximate percentage drop in brightness?
What planetary characteristic is determined directly by the depth of the transit dip?
What parameter, derived from the orbital period and Kepler's Third Law, indicates a planet's average distance from its star?
What key property related to composition cannot be measured directly using the transit method alone?
What is the most common source of false positives that mimic a planetary transit signal?
For a planet orbiting a Sun-like star, what is the approximate chance that its orbital inclination will align correctly for a transit to be witnessed?