Biology ch4 & 5

which statements are true comparing active transport to passive transport?

=- active transport requires energy - passive transport doesnt require energy - passive transport includes simple diffusion and facliltated diffusion - passive transport moves molecules from an area of high concentration into an area with lower concentration - active transport moves molecules against gradient

in which direction will water move?

to sida a

What happens when the membrane doesn't allow the passage of both glucose and sucrose through?

water will move from the hypotonic side into the hypertonic side

which of these statements are correct about hypertonic and hypotonic solutions?

- HYPERTONIC solutions have more water than hypertonic solutions - HYPEEERTONIC solutions have more solutes than hypotonic solutions

the main categories of cell transport are either active and passive transport. which two statements are true?

-active transport requires energy -passive transport doesn't require energy

which structure are common to both plant and animal cells?

-cell membrane -mitochondria -nucleus

which of these statements are true when comparing facilitated diffusion vs simple diffusion?

-ions need channel proteins to cross membrane, even when moving along the gradient -small non polar molecules use simple diffusion -facilitated diffusion is for molecules that cannot cross the plasma membrane -gasses use simple diffusion -simple diffusion doesn't use carrier proteins or channel proteins

which of these statements are true about active transport?

-molecules move against their gradient -it uses a transporter protein -molecules move from a side of low concentration to a side of high transportation -it requires energy

which of these components do you see in all cells?

-plasma membrane -ribosomes -cytoplasm -DNA

which molecule can pass through the plasma membrane without any assistance, using simple diffusions?

-small non-polar molecules -gasses -small fats

What happens when the membrane allows the passage of both glucose and sucrose through?

Both, glucose and sucrose will move from their side of high concentration to their respective side with lower concentration

in which type of solution would you place red blood cells if you dont want to cause a net movement of water

Isotonic solution

how come if larger cells have more volume and more surface area than small cells, large cells have a lower surface area to volume ratio?

bc the volume of the cell increases faster than its surface as the cell gets bigger

how is surface area to volume ratio related to the efficiency of cells?

cells need large surface area to volume to speed diffusion of substances

Red blood cells are isotonic to the surrounding plasma solution in which they live. Comparing the contents of red blood cells to their external environment, red blood cells...

have different molecules inside but maintain the same osmolarity as the surrounding plasma

water moved from....

hypOtonic to hypERtonic

where do photosynthetic prokaryotes carry out photosynthesis?

in the plasma membrane

why is the plasma membrane called a "mosaic"

it contains different types of lipids and proteins imbedded in the bilayer

what is the difference between osmosis and diffusion?

osmosis is the movement of water from the side with low solutes to the side with more solutes

what would you call the movement of glucose observed here?

passive treatment

Which cell structure makes protein?

ribosomes

why is the plasma membrane called a fluid?

the components of the membrane are not permanently attached to each other and can ma=ove freely within each other