Download HOMEWORK ASSIGNMENTS FOR: Date _____11/18/15__ Wednes

HOMEWORK ASSIGNMENTS FOR:
Date _____11/18/15__
Wednesday________
Teacher ____Ms. Weger__________________
Subject/Grade _____Science____7th
Grade____
In-Class:
** Note: yesterday we spent time going over and discussing the “Discovering Cells”
reading and grading the assignment; we did not get to the rest, which is described below
and the plan for the day.
 Diffusion demonstration
o Discuss how osmosis is like this?
 Class Notes 2-1
o Discuss and add to notes
 How are endocytosis and exocytosis different from diffusion?
 How are these two processes similar to diffusion?
 How will you remember the difference between endocytosis
and exocytosis?
 Why are all of these processes so important to any living thing?
Homework:
 Complete the 2-1 Reinforcement WS “Exchange with the Environment”
o Read the instructions carefully!!
o Work in pencil so you can change any answers if needed when we go
over it
Announcements/Reminders:
 Work on CSR for Measurement Quiz if needed
o If you scored 26 or below, please plan to do CSR—due by Tuesday,
November 24
o Please see CSR instructions and follow them carefully; you may get a
copy in class
 Mini-Quiz over 2-1 on FRIDAY, 11/20
o Study Vocabulary (with your “Foldable”), look at the pictures in the
book, review the 2-1 Directed Reading and the “Reinforcement” WS
(will go over this in class tomorrow)
CHAPTER 2 NOTES-The Cell in Action
SECTION 2-1---Exchange with the Environment
*An organism’s cells allow organisms to obtain energy and raw materials and get rid of
wastes. These functions keep cells healthy so they can divide. Cell division allows
organisms to grow and repair injuries.
DIFFUSION—movement of particles from regions of higher density to regions of lower
density
 OSMOSIS---The diffusion of water through a semipermeable membrane (very
important to life processes)
*semipermeable means that only certain substances can pass through
*osmosis is very important to cell functions---keeps concentration of
different particles in balance
Moving small particles like sugar across the cell membrane…
PASSIVE TRANSPORT-movement of particles across a cell membrane without the use
of energy by the cell
 Particles move from an area of high concentration to an area of low concentration
ACTIVE TRANSPORT-process of transporting particles that requires the cell TO USE
energy
 Particles move from an area of low concentration to an area of high concentration
Moving large particles like waste across the cell membrane…
ENDOCYTOSIS-process by which a cell membrane surrounds a particle and encloses
the particle in a vesicle to bring the particle into the cell (see Figure 4)
EXOCYTOSIS-process in which a cell releases a particle by enclosing the particles in a
vesicle that then moves to the cell surface and fuses with the cell membrane
Skills Worksheet
2-1 Reinforcement
Exchange with the Environment
Into and Out of the Cell
Complete this worksheet after you finish reading the section “Exchange with the
Environment.”
Each of the boxes below represents a different method cells use to bring small particles into
the cell or to take small particles out of the cell. Add the notes at the bottom of the page to
the appropriate box. Be careful—some notes can be used more than once.
Small Particle Transport
Osmosis
Passive Transport
Active Transport
Notes
• particles move
• particles move from
• particles move from
through proteins
• sugar
• requires ATP
an area of high
concentration to an
area of low
concentration
• does not require
ATP
an area of low
concentration to an
area of high
concentration
• water
(ATP = Energy)