SC 135 - Third Exam Spring 2010

Links connect to relevant parts of the online book.



On the line to the left, place the letter of the choice that best answers the question.
Three Points Each. NOTE: "e" answers are never the correct answer.

                1.  A bad fertilizer solution has a lower concentration of water than found in the root cells of the treated plant. Which bad thing should happen?

_______ a. Osmosis from roots out         b. Osmosis from soil in        c. Nutrients diffuse into roots         d. Nutrients diffuse out of roots
                                                                            e. The plant won't look pretty

                2.  Which of these are the DNA-spooling proteins?

_______ a. Prions         b. Chaperonins         c. Histones        d. Microtubules         e. Spoolies

                3.  Which serves as a cell's transport channel system?

_______ a. Cell membrane         b. Spindle         c. Vesicles        d. Endoplasmic reticulum         e. Time Warner

                4. Singlet-doublet chromosomes are sometimes used to produce

_______ a. Dominant traits         b. Gender        c. Recessive traits         d. Transfer RNA        e. Cute little crochet patterns

                5.  A cell's internal structures can be built from all of these except

_______ a. Membranes         b. Microstruts         c. Microtubules        d. Microfilaments         e. Microband-aids

                6.  When treated with radiation, cancer cells are likely to die

_______ a. As soon as the radiation hits them                    b. After the cell has divided            c. Just after they absorb the radiation
              d. They don't die, they just become non-cancerous                e. And no one is going to try to save them

                7.  Which condition is directly associated with central vacuoles?

_______ a. Droopy house plants         b. Smelly cheese        c. Brown grass         d. Dead fish            e. Is "exploding brain" a condition...?

                8.  If a gene sequence mutates, it will certainly

_______ a. Cause major problems         b. Cause some sort of problem        c. Be a different allele         d. Have no actual effect
                                                                            e. Be used in a zombie movie

                9.  Which cell function is performed by organelles that probably began as endosymbionts?

_______ a. Mitosis         b. Movement         c. Digestion        d. Photosynthesis         e. Is this an immigrant thing-?

                10. Which of these is generally a bad thing?

_______ a. Diploid             b. Metaploid             c. Polyploid            d. Haploid             e. Weird sound: "Ploid, ploid, ploid..."

                11. The function of a nucleolus mostly involves

_______ a. DNA copying         b. DNA processing         c. RNA storage        d. A double membrane         e. Boring stuff

                12. How much of a human being's DNA is actually gene codes?

_______ a. 100%             b. 90% - 95%             c. 60% - 75%            d. Less than 20%             e. Am I supposed to think this out? Yikes!



Answer any eight of the following questions for 4 Points Each.
Note: if you answer more than eight, only the first eight will be corrected.
You can get partial credit on these answers.

1.  What happens in a peroxisome?


2.  Give two different pieces of evidence that support the endosymbiont theory.



3.  What are two ways that prokaryote chromosomes are different from eukaryote chromosomes?



4.  For contractile vacuoles -
What sort of
organisms have
What are
they used
5.  What is a Barr body?


6.  What was the fluid mosaic model developed to describe?

7.  Why is a substitution point mutation less dangerous than an insertion or deletion?


8. In which organelles do the following happen?
9.  A chromosome is mostly a combination of what two different types of molecules?

10. What are on the two functional ends of a transfer RNA molecule?

11. If a cell is full of golgi bodies, what is that cell probably doing?

12. For a high chromosome number, what's the biggest -




13. What are two major groups of organisms that have cell walls?

14. What is apoptosis?

15.  What are two different things that attach to centromeres?


16. What is cytokinesis?



Answer any four of the following questions for Eight Points Each.
Note: if you answer more than four, only the first four will be corrected.
You can get partial credit on these answers.

1.  Name and briefly describe four cell structures (that would not include embedded proteins) found on or around the outside of a eukaryote cell.








2.  Give three sets of differences (other than the associated genders) between -






4. Pick two of these three genetics terms, and explain how each one works.

4.  Give, in order, the four steps of actual mitosis, and for each give one thing that happens just during that stage.








5.  What are four different functions that are performed by proteins embedded in cell membranes?




6.  Given here is one side (strand) of DNA. Starting with this strand, and using the table attached to the back of the exam, show:
Starting      ____________________________________________________________
      T A C A G C C C C G C A T T G C T A G G G A T T

                                               Messenger RNA from 1st strand

                                                         Amino Acid Sequence

Link to Answer Key


Answer as many as you are able. Wrong answers will not result in points being lost from the main exam. You can get partial credit on these answers.

For Four Points, produce a labeled drawing to show how phospholipid molecules are arranged in a membrane.

Explain why secretion from a cell has to be active transport. Three Points.

What makes rough endoplasmic reticulum "rough"? Three Points.

Why do many genetics studies use mtDNA? Three Points.

For Two Points Each, what areas of human health are involved with telomere research?

Which group of organisms commonly uses sexual reproduction without using genders? Three Points.

What aspect of HIV makes it more likely to produce escape mutants? Three Points.

And what are they "escaping"? Three Points.

When Ich, a parasite of aquarium fish, divides, what unusual thing happens?




Michael McDarby.

SC 135

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