Cell Membrane Essay Eukaryotic Cells Essay Cell Membrane Lab Report Essay about Cell Membrane Transport

1. Cell Membrane Essay
The normal cell membrane and the structure commonly called a "basement membrane" differ
because:
0.5 points were deducted
Incorrect:
Choice A is correct because the basement membrane is where a cell attaches to the "lining", so the
basement membrane will always be outside the normal cell membrane as it is not a part of the actual
enterocyte or keratinocyte cell, just where it attaches to.
7. Which of the following is an example or description of negative feedback? 0.5 points were
deducted
Incorrect:
Choice B is correct because the working muscle gets hot and the blood that is being pumped into the
muscles is cooler than the muscles themselves, so blood flow into the working skeletal muscle will
cool the muscle back down.
8. Which...show more content...
1.5 points were deducted
Correct:
Choice B is incorrect because too much carbohydrates lead to the cause of coliform bacteria to die,
not acidophilic bacteria. Acidophilic bacteria means acid loving bacteria, so the heightened ph
would not kill them, it would make more of them grow. If more of them grow, the LPS that causes
inflammation is not circulating, because they would only circulate if the bacteria dies.
Incorrect:
Choice C is correct because acidosis degrades tight junctions between enterocytes in the colon and
the cecum, which in turn lets more endotoxins from the bacteria into the blood that causes the
inflammation in laminitis.
Choice D is correct because the acidosis kills coliform bacteria, releasing LPS into the system and
the LPS causes the inflammation that in turn reduces blood flow and kills the tissues that cause
laminitis.
29. Insulin resistance could increase the likelihood of laminitis because: 1.5 points were deducted
Incorrect:
Choice A is correct because the stress of too much conversion ofglucose into triglycerides can cause
insulin resistance. If there are more triglycerides, there is more fat storage within an adipocyte,
causing the animal to gain weight. With more weight, there is more pressure on the structure of the
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2. Eukaryotic Cells Essay
Eukaryotic Cells The cell may be regarded as the basic unit of an organism, it carries out the
essential processes that make the organism a living entity. All cells share certain structural and
functional features and they are of almost universal occurrence in living organisms. Biologists have
devoted a great deal of attention to its structure and the processes that go on inside it. They have
recognised a major distinction between two types of cells, Eukaryotic cells that have a nucleus and
Prokaryotic cells that do not have a nucleus. There are many other differences between these two
cells, in particular eukaryotic cells have a full complement of membrane...show more content...
The formation of the proteins and phospholipids is called the lipid bylayer. The proteins take the
form of globules dotted about in a mosaic pattern with some being attached to the urface of the
membrane while others penetrate into it to varying extents. Some of these proteins act as enzyme
catalysing chemical reactions within the membrane and also as pumps and channels transporting
molecules into and out of the cell. The plasma membrane is perforated by pores and allows
substances to pass in and out of the cell by Diffusion Active Transport, osmosis, Endocytosis and
Exocytosis. The external cell membrane contains lipids and proteins combined with sugar
molecules called Glycolipids and Glycoproteins. The sugar molecules only attach to the outside of
the cell membrane and form what is known as the Glycocalyx or cell coat. The Glycocalyx is
sticky and enables animal cells to adhere to each other. In the development of organisms cells must
migrate from one region to another and recognise what kind of cells are their proper neighbours and
what kinds are not. This recognition ability appears to lie within the Glycocalyx.
The endoplasmic reticulum is found in the cytoplasm of the cell and like the plasma membrane is
composed of phospholipids and protein. ER is an intracellular transport system moving materials
from one
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3. Cell Membrane Lab Report
Lab #1: Cell Membrane
Prepared for
Gary V. Lawrence
Biology 0983
By
Zane Jeffels
Partners: Lily Juno, Huynh, and Lin Yan Sun
Preformed:
October 11th, 2010
Due:
October 25th, 2010
King Edward Campus– Rm. 3275
Vancouver Community College
Abstract
The purpose of this lab was to determine if hemolysis would occur, and how long it would take to
occur to red blood cells when blood suspension is introduced to solutions prepared at different
temperatures, and solutions prepared at different tonicities. In part 1, red blood cells were
suspended in four different solutions of NaCl (Sodium Chloride) and timed to see if and how long
it would take for hemolysis to occur. In Part 4, blood suspension...show more content...
The temperature and tonicity of blood plasma are crucial to life and are regulated by osmoregulation
in the kidneys. This maintains our blood to be in somewhat of an isotonic state.
Background Theory
Campbell et al, 2007 and VCC Biology 0983/0993 Laboratory Manual were used and can be
referenced as relevant background theory for this lab. The following topics referenced included: –

4. Diffusion and osmosis. – How tonicity affects the movement of water molecules across the cell
membrane. – How temperature affects the movement of water molecules across the cell membrane.
– The role of transport proteins (aquaporins) in human blood cell membranes.
Hypotheses: Part 1 & Part 4
If blood plasma, containing red blood cells, is suspended in a hypotonic solution, such as 0.18%
NaCl, then it is likely hemolysis will occur because water will diffuse from high concentration,
which is outside the cells to low concentration, which is inside the cells with the help of transport
proteins called aquaporins.
If there is an increase to solutions temperature which red blood cells are suspended, then it is likely
the rate at which hemolysis occurs will speed up because water molecules are moving faster
increasing the rate osmosis and diffusion.
Materials & Methods
VCC Biology 0983/0993 Laboratory Manual (1996), Cell Membrane Lab: Part 1(p.34–35) and Part
4(p.39–40) materials and methods can be referred to as
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5. Essay about Cell Membrane Transport
Cell Membrane Transport
Hands–On Labs, Inc. Version 42–0034–00–01
Lab Report Assistant This document is not meant to be a substitute for a formal laboratory report.
The Lab Report Assistant is simply a summary of the experiment's questions, diagrams if needed,
and data tables that should be addressed in a formal lab report. The intent is to facilitate students'
writing of lab reports by providing this information in an editable file which can be sent to an
instructor.
Exercise 1: Diffusion through an Artificial Membrane
Observations...show more content...
It is semi–permiable
H. Is the transport mechanism in the model cell passive or active? Why?
Passive....because active transport travels ACROSS a cell
Exercise 2: Diffusion at different temperatures Observations
Data Table 3: Diffusion of KMnO4 at Various Temperatures and Times| Temperature inside cup|
Color of Water| | 0 min| 5 min| 40c| Bright Purple| Deeper purple| 5c| Bright Purple| Slightly paler
purple| 25c| Bright Purple| Stayed the same|
Questions
I.How does temperature affect the rate of diffusion?
J.State a general hypothesis to cover how temperature affects rate of diffusion The higher the temp
the quicker the diffusion
Exercise 3: Tonicity and Diffusion Observations
Data Table 4: Potato Dimensions.| Potato| Before Osmosis(L Г— W) cm| After Osmosis(L Г— W)
cm| TonicityHypertonic, Isotonic, orHypotonic| Distilled water| 7cm x 0.5cm| | hypertonic| 10%
Sodium Chloride| 7cm x 0.5cm| | hypotonic|
Questions
A. What is the condition of each potato strip after soaking in the test tubes for an hour? Which one
is limp and which one is crisp?
#1 (salt & distilled water) was crisp
#2 (10% sodium choloride was limp

6. B. How would you explain the difference in the conditions of the potato strips using the concept of
tonicity?
Limp = water has left the potato (hypertonic) rigid= water has entered the potato (hypotonic)
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