Biology Cell Transport Mechanisms

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What should be avoided when covering a slide with a coverslip?

Using too much solution

Incorrect labeling

Excessive magnification

Air bubbles (correct)

What is the primary purpose of adding solution C to the blood drop?

To dilute the sample

To alter the cell's osmotic environment (correct)

To increase visibility under a microscope

To create a covering layer

What is not necessary when preparing the slides for observation?

Carefully covering with a coverslip

Adding three different solutions

Using high magnification only (correct)

Taking pictures of each slide

When comparing the slides, what should be identified regarding their solutions?

The osmotic nature of the solutions in each slide Signup and view all the answers

What cellular components should be labeled after observing the slides?

Cytoplasm and membrane Signup and view all the answers

Which of the following accurately describes osmosis?

Diffusion of water across a selectively permeable membrane Signup and view all the answers

What distinguishes facilitated diffusion from active transport?

Use of energy Signup and view all the answers

Which characteristic is true for isotonic solutions in relation to cells?

They equalize solute concentration inside and outside the cell Signup and view all the answers

What is the appropriate orientation of the onion tissue layer when placed on the microscope slide?

Shiny side facing up Signup and view all the answers

What is the purpose of covering the slide with a coverslip?

To prevent evaporation of the solution Signup and view all the answers

When preparing the slides, why is it important to avoid air bubbles under the coverslip?

They decrease the visibility of the tissue Signup and view all the answers

Which of the following solutions generally corresponds with a hypertonic environment when observing cells?

1.8% NaCl Solution Signup and view all the answers

What should you do to ensure each slide is correctly labeled?

Label them with group and solution details Signup and view all the answers

What part of the microscope is primarily used to observe the cell details after preparing your slides?

The lens Signup and view all the answers

In experiments involving human red blood cells, why is it essential to add a drop of blood onto a clean slide?

To prevent contamination Signup and view all the answers

What should be observed to differentiate the effects of the three solutions on onion cells?

Shape and size of cells Signup and view all the answers

What characteristic of the cell membrane allows it to control the entry and exit of substances?

It is selectively permeable. Signup and view all the answers

In osmosis, water moves from regions of _ to regions of _ concentration.

high; low Signup and view all the answers

When a red blood cell is placed in a hypertonic solution, what will happen to it?

It will lose water and shrink. Signup and view all the answers

If a solution has a lower concentration of solutes than the inside of the cell, it is termed ____.

hypotonic Signup and view all the answers

What happens to a plant cell when it is placed in a hypertonic solution?

It undergoes plasmolysis. Signup and view all the answers

What is the primary purpose of passive transport in cells?

To facilitate the movement of molecules without energy expenditure. Signup and view all the answers

Which of the following best describes an isotonic solution?

It has an equal solute concentration as the cell. Signup and view all the answers

Facilitated diffusion is best described as ____.

the process using specific carrier proteins to move substances. Signup and view all the answers

Study Notes

Introduction

Passive transport moves ions and molecules across membranes without energy.
All living organisms have basic functional units called cells.
Cells have organelles and a nucleus surrounded by membranes.
Cell membranes separate the inside from the outside environment.
Membranes are selectively permeable.
Transport balances the concentrations inside and outside the cell.

Passive Transport Types

Diffusion: Movement of substances from high to low concentration.
Facilitated diffusion: Diffusion with the help of proteins.
Osmosis: Water movement across a semi-permeable membrane from higher to lower water concentration (low to high solute).

Solutions and Concentration

Hypertonic solution: Higher solute concentration.
Hypotonic solution: Lower solute concentration.
Isotonic solution: Equal solute concentration.

Objectives

Observe various cell types, noting differences at different magnifications.
Test the rates of penetration and diffusion in different solutions.

Materials

Pipettes
Microscope slides
Cover slips
Microscope
Scissors
Forceps
Onion
Red blood cells
Solutions (Hanks Buffer, Distilled Water, NaCl)
Stain (e.g., Blue Stain)
Camera

Procedure - Part A: Onion Plant Cells

Prepare onion slides with a few different solutions.
Observe the slides under low and high magnification, labeling cell parts.
Compare the slides and determine which solution corresponds to a) hypotonic, b) isotonic or c) hypertonic solution.
Take photos.
Record observations.

Procedure - Part B: Human Red Blood Cells

Prepare red blood cell slides with a few different solutions.
Observe the slides under low and high magnification, labeling cell parts.
Observe the effects of different solutions.
Compare the slides and determine which solution corresponds to a) hypotonic, b) isotonic or c) hypertonic solution.
Take photos.
Record observations.

Additional Questions

Compare and contrast human and plant cells.
Define osmosis, facilitated diffusion and active transport, and differentiate them.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Description

This quiz focuses on the concepts of passive transport and cell membranes, including diffusion, facilitated diffusion, and osmosis. Test your understanding of how substances move across cell membranes and the types of solutions affecting cells. Perfect for students exploring cell biology and membrane dynamics.