Biology 1 Chapter 7.3 worksheet

A group of similar cells that preform a particular function is called what?

A tissue

Suppose you add a teaspoon of sugar to a cup of coffee, & the sugar molecules disperse themselves throughout the hot coffee. What process has occurred? How do you know? *short answer*

Diffusion because the sugar molecules are moving from a higher concentration to a lower concentration until equilibrium is reached.

What type of diffusion uses protein channels to move across the membrane

Facilitated diffusion

Solution that causes cell to shrink.

Hypertonic solution

The energy needed for active transport is ATP. *true or false*

True

Moving materials from an area of low concentration to an area of high concentration requires _________ transport.

Active

Some materials can move across the cells membrane against the concentration gradient by _________________.

Active transport

Which means of particle transport requires input of energy from the cell?

Active transport

The cells of unicellular organisms are able to do what?

Carry out all of the functions necessary for life

The cells in a multicellular organism have specific jobs. This is called ____________________.

Cell specialization

Which of the following activities is NOT a way that unicellular organisms maintain homeostasis?

Cell specialization

List the four levels of organization in a multicellular organism in order from simplest to most complex. *short answer*

Cell, tissue, organ, organ system

Which list represents the levels of organization in a multicellular organism from the simplest level to the most complex level?

Cell, tissue, organ, organ system

During diffusion, when the concentration of molecules on both sides of a membrane is the same, the molecules will do what?

Continue to move across the membrane in both directions. Also known as dynamic equilibrium.

Molecules tend to move from one area where they are more concentrated to an area where they are less concentrated. This process is called ________.

Diffusion

Active transport requires what?

Energy

Once ____________ is reached, roughly equal numbers of molecules move in either direction across a semipermeable membrane, & there is no further change in concentration on either side of the membrane.

Equilibrium

Large molecules, such as glucose, that cannot cross the lipid bilayer can still move across the membrane through a type of passive transport called ____________.

Facilitated diffusion

How do facilitated diffusion and active transport differ? Is osmosis an example of facilitated diffusion or active transport?

Facilitated diffusion is a type of passive transport in which ions/molecules cross the semi permeable membrane because permeases present in the membrane facilitate the transport. Like simple diffusion facilitated diffusion doesn't require metabolic energy and simply occurs across the concentration gradient.

Which of the following is not a type of active diffusion?

Facilitated diffusion. If it is any type of diffusion it is passive

The two types of tissues are plant & animal. *true or false*

False. The 2 types of tissues are muscular, nervous.

What term describes the relatively constant internal physical conditions of an organism?

Homeostasis

A solution in which the solution has higher solute concentration than the cell.

Hypertonic solution

A solution in which the solution has a lower solute concentration than the cell.

Hypotonic solution

Solution that cause the cell to swell & get bigger.

Hypotonic solution (think of a hippo)

A solution in which the concentration of diluted is the same on the inside & outside of the cell.

Isotonic solution

Explain, in terms of osmosis, why a raisin placed in a cup of pure water overnight will puff up with water. *short answer*

It is in a hypotonic a environment & the inside of the raisin has less water in it then surrounding it. So the water will go into the raisin

Draw & label the cell membrane with the following:

Lipid bilayer, lipid (hydrophilic head & hydrophobic tail), membrane proteins (aquaporins), carbohydrate chain, & O2 & CO2

There is division of labor among the cells of ____________ organisms.

Multicellular

The cells of ___________ organisms become specialized for particular tasks & communicate with one another to maintain __________.

Multicellular; homeostasis

An example of facilitated diffusion

Osmosis

The diffusion of water across a selectively permeable membrane is called what?

Osmosis

Proteins called aquaporins are important to the movement of water through cell membranes. These protein channels participate in _____________.

Osmosis/ facilitated diffusion/ or passive transport

The movement of materials across the cell membrane without using cellular energy.

Passive transport

A type of endocytosis in which extensions of the cytoplasm surround a particle & package it within a food vacuole. "Cell-eating"

Phagocytosis

Type of endocytosis where tiny pockets form along the cell membrane, fill with liquid & pinch off to form vacuoles in the cell. "Cell-drinking"

Pinocytosis

Cells within a multicellular organism communicate by chemical signals. In order to receive & respond to a certain chemical signal, a cell must have a ________ for that chemical.

Receptor

What would happen to an animal cell with an internal salt concentration of 0.8% if it were placed in a salt solution with a concentration of 0.2%? Why? *short answer*

The animal cell will fill with water & eventually because it is in a hypotonic solution because there is more water on the outside of the cell then there is inside the cell.

How are endocytosis & exocytosis alike? How are they different? *short answer*

The are alike because they are both examples of active transport. They are different because endocytosis is moving proteins into the cell & exocytosis is moving proteins out of the cell

What do unicellular organisms need to maintain homeostasis?

They need to grow, respond to their environment, transform energy, & reproduce

A single-celled organism does everything you would expect a living organism to do. *true or false*

True

A cell in a ___________ organism must be able to carry out all of the functions necessary for life in order for the organism to survive.

Unicellular

An animal cell that is surrounded by fresh water will burst because the osmotic pressure causes what?

Water to move into the cell

An organ system is a group of organs that do what?

Work together to preform a specific function