Biology; Homeostasis, Cell Transport and Feedback Loops

Maintaining internal stable conditions

Maintaining internal stable conditions

homeostasis

Which of the following best describes the structure of the cell membrane

All of the above

The movement of materials across a cell membrane WITHOUT using energy:

passive transport

If the concentration gradient is steeper, how will that affect the rate of diffusion?

Speeds it up

Uses carrier proteins to allow for rapid diffusion to transport molecules that are larger like glucose

facilitated diffusion

A cell that is 20% glucose that is placed in a solution that is 80% glucose? Which best describes environment?

The cell exists in a hypertonic environment

If the interior of a cell is 25% glucose and the environment is 25% glucose, describe the movement of water

equal number of water molecules both entering & leaving

Why might road salt used to melt ice in winter be bad for trees in the spring?

salt creates hypertonic effect which cause trees to wilt/die

These red blood cells show that water has exited the cells. Which best describes the environment they are in?

Hypertonic

Which of the following is true about positive feedback loops:

body increases a change or tries to make it happen faster

Which of the following is true about negative feedback loops:

your body reverses the change back to normal to maintain homeostasis

Choose the best description for the part labeled B

hydrophobic "tails"

Feeding method used by many unicellular organisms, like amoebas

phagocytosis

When a cell shrinks from not enough water,

turgor pressure decreases & plasmolysis occurs

As water diffuses into plant cells, it creates pressure against the cell wall called

turgor pressure

Cytolysis of a human red blood cell would occur if the cell were...

in a hypotonic solution

If someone burns popcorn in the microwave, people can soon smell it in a nearby room. This is...

diffusion

When vesicles in the cytoplasm fuse with the cell membrane to release contents out of the cell

exocytosis

Temperature regulation in mammals is an example of...

negative feedback loop

Pregnancy (contractions) or fruit on trees ripening all at once is an example of...

positive feedback loop

Which type of proteins are embedded in the cell membrane & can form channels to allow molecules to pass through?

integral proteins

Membrane proteins that assist in the active transport of molecules moving UP or AGAINST their concentration gradient

cell membrane pump

Membrane proteins that transport ions

ion channels

Membrane proteins that allow molecules to move DOWN their concentration gradient

carrier proteins

Property of water that provides a stable temperature for aquatic organisms

high specific heat

Property of water that allows water to travel upwards through the roots, stems, & leaves or plants?

capillarity

Molecule that provides the energy needed to drive the sodium-potassium pump

ATP

If an egg is placed in plain water (0% solutes), the egg would be considered to be

hypertonic

Water is an effective solvent because it is

polar

What process uses cell energy to move substances across the membrane against or up their concentration gradient?

active transport

Which labeled part of the water molecules shown below is Oxygen?

A

Which labeled part of the water molecules shown below is the HYDROGEN BOND?

C

What organelle will fuse with the vesicles to break down and release their contents?

lysosome