Umuc biology 102 / 103 lab 3: cell structure and function answer key

This contains 100% amend embodied for UMUC Biology 103 LAB03. However, this is an Apology Key, which media, you should put it in your own utterance. Here is a mode for the Pre lab questions apologyed:

Pre-Lab Questions

1. Fulfill the main homogeneousities and disagreements betwixt prokaryotic and eukaryotic cells. (2 pts)

Prokaryotes watch to be less complex than eukaryotic cells, delay fewer organelles and (generally) fewer requirements for prosperity. Eukaryotes entertain a nucleus, period prokaryotes do not. Both eukaryotes and prokaryotes entertain DNA, a cell membrane, and cytoplasm.


2. Where is the DNA comforteffectual in a prokaryotic cell? Where is it comforteffectual in a eukaryotic cell? (2 pts)

DNA is comforteffectual in the nucleus in eukaryotic cells. Prokaryotic cells do not entertain a central-part, and thus DNA exists freely in the cytoplasm.


3. Fulfill three structures which collect help and safety in a eukaryotic cell. (2 pts)

The cell membrane, the cytoplasm, and the cytoskeleton (microtubules, microfilaments, etc.).


The repose of the questions are apologyed as well:


 Onion Root Tip 100X g (Small)

Experiment 1: Cell Structure and Function

Post-Lab Questions

1.    Label each of the arrows in the subjoined slide copy:



2.    What is the disagreement betwixt the shaggy and allay endoplasmic reticulum?




3.    Would an voluptuous cell be effectual to outlast delayout a mitochondria? Why or why not?




4.    What could you mention environing a mode if you observed a slide copy showing the mode delay a cell rampart, but no central-part or mitochondria?




5.    Hypothesize why cleverness of a stock, such as the leaves, are galled, but other cleverness, such as the roots, are not. Use philosophical rationalistic to help your conjecture.






Experiment 2: Osmosis - Direction and Force Gradients

Data Tables and Post-Lab Assessment

Teffectual 3: Sucrose Force vs. Tubing Permeability

Band Color

Sucrose %

Initial Association (mL)

Final Association (mL)

Net Displacement (mL)



























Post-Lab Questions

1.    For each of the tubing partys, fulfill whether the explanation internally was hypotonic, hypertonic, or isotonic in similitude to the beaker explanation in which it was placed.


2.    Which tubing increased the most in association? Expound why this superveneed.





3.    What do the results of this trial this report you environing the referring-to tonicity betwixt the deviation of the tubing and the explanation in the beaker?




4.    What would supervene if the tubing delay the yellow ligament was placed in a beaker of distilled breathe-into?




5.    How are superfluity salts that gather in cells communicated to the lineage progress so they can be removed from the association? Be stable to expound how this system works in conditions of tonicity.




6.    If you wanted breathe-into to progress out of a tubing party populated delay a 50% explanation, what would the restriction force of the beaker explanation want to be? Expound your apology using philosophical testimony.




7.    How is this trial homogeneous to the way a cell membrane works in the association? How is it irrelative? Be biased delay your repartee.