Biology, 29.01.2020 03:58 maddielarman6483

Materials are able to move across a cell membrane through one of two methods: active transport or passive transport. what is the difference between active transport and passive transport?

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Answer from: layla07

Active transport uses energy (ATP) and passive transport does not. Active transport goes against the concentration gradient whilst passive transport does not.

Answer from: yokis2710

Active transport is the movement of molecules across the cell membrane from an area of lower concentration to an area of higher concentration. This process requires chemical energy made by the cell. Passive transport is the movement of molecules across the cell membrane from an area of higher concentration to lower concentration. This DOES NOT require chemical energy made by the cell. Here's a tip that always helped me remember this. If you are doing something active (playing a sport, etc), you are using a lot of your energy. However, if you are doing something passive (sitting on the couch, etc), you are not using your energy. It's like that with the active and passive forms of transport as well. Make sense? :)

Answer from: Quest

tsd is temerature dependent sex determination.

tsd: it is a type of environmental sex determination in which the temperature experienced during embryonic/ larval development (ambient temperature for development) determine the sex of the offspring.

crocodile displays the tsd where the ambient temperature of the developing egg determines the individual's sex. for example in the american alligator's eggs, incubation at 33 ºc produces mostly males, while incubation at 30 ºc produces mostly females. so if the american alligator's egg will get the ambient temperature (33 degree celcius)during embryonic development from egg, the offspring will be male and same for the female sex determination.

Answer from: Quest

ecological efficiency: % of usable energy transferred as

biomass from one trophic level to the next typical is 10% efficient (90% of

energy is lost),is diagramed as the pyramid of energy flow. then osprey eagle

are tertiary consumer and the shrimp are primary consumer, so to balance

mass of shrimp (1/0.1) / 0.1 = 100 kg

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