SC 135 - Third Exam Fall 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.  The mathematical relationship between surface area and volume is used to explain

_______     a. Endosymbiont theory             b. DNA coding            c. Cell size limits             d. Chromosome number            e. Why those jeans won't fit

                2.  Recycling of materials generally happens in

_______     a. Golgi bodies             b. Peroxisomes             c. Ribosomes            d. Genes             e. Itty-bitty special bins


                3.  Endocytosis gives a cell a way to

_______     a. Eat                 b. Reproduce                 c. Move                d. Communicate                 e. Confuse students

                4.  A high chromosome number is associated with what type of mutation?

_______     a. Deletion point mutation             b. Extra set of chromosomes            c. Extra or missing chromosome             d. Crossing over mutation
                                                                                e. Chromosomes mutate by getting high???

                5.  A karyotype is a combination of

_______     a. Genes and allele         b. Chromosome number and shapes        c. Nucleus size and shapes         d. Division and fusion
                                                                    e. A weird word and a failing memory


                6.  Why is a prion like a zombie?

_______     a. It gets changed and then changes others            b. It isn't really alive            c. They may not exist            d. All of these
                                                                                    e. A zombie question? Really?

                7.  Radiation damage often kills cells

_______     a. Just before they divide             b. After they divide             c. Just after exposure             d. Weeks after exposure
                                                            e. After they become dog-sized and eat people

                8.  Which organelle stores and processes RNA?

_______     a. Rough endoplasmic reticulum             b. Smooth endoplasmic reticulum            c. Cytoskeleton            d. Nucleolus
                                                                            e. Walmart's RNA Distribution Center

                9.  Two research areas very interested in telomeres:

_______     a. Aging and cancer             b. Alzheimer's and diabetes            c. Birth defects and heart disease             d. Mutations and evolution
                                                                        e. Erectile dysfunction and megaburping


                10. Which is supposed to produce haploid cells?

_______     a. Translocation                 b. Mitosis                 c. Meiosis                d. Mosaicism                 e. Isn't that an iPhone app?


                11. In response to insulin, sugar moves from the blood into liver cells; soon, the concentration in the liver cells exceeds that of the blood,
                           and it keeps moving in. This involves

_______     a. Active transport             b. Facilitated diffusion            c. Osmotic pressure             d. Passive transport             e. The liver...and the blood...

                12.  When cancers become malignant, the cells develop the ability to crawl using thick cell projections. This means they have activated the gene for

_______     a. Linkage                 b. Cytoskeleton                 c. Permeability            d. Pseudopods             e. Blobbiness



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.  Why exactly would a cell be in trouble if its chaperonins weren't working?


2.  What makes homologous chromosomes homologous? (Define)


3.  What are the two main molecule classes found in chromatin?


4.  For apoptosis -
What organelle
is commonly
5.  Describe the functions of two different types of membrane proteins.


6.   What is a Barr body?


7.  Briefly explain how root pressure moves water up a plant.


8.  For HIV escape mutants -
What are
exactly is
9.  What is likely to be a major function in a cell with lots of -


10.  In what two major (Kingdom-level) groups are cell walls a "standard" feature?


11.  What two cell organelles that are thought to have started as endosymbionts?


12. What are the two functional ends of transfer RNA?


13. For the fluid mosaic model, what is -
The "Fluid"
The "Mosaic"
14. Which two point mutations involve a frame shift?


15.  What exactly makes an allele recessive?



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






2.  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  G  C  G  C  G  C  A  T  G  G  C  T  T  G  G  A  A  T  T 


                                                                     Messenger RNA from 1st strand

                                                                                     Amino Acid Sequence

3.  What are the "rules" of the Cell Theory?




4.  Give three sets of differences between -






5.  What are four features of prokaryotes that are different from those of eukaryotes?






6.  Fill in for two different types of vacuoles -




7.  What are three different ways that fresh-water organisms prevent damage from osmosis?






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.

In early studies of cell membranes, how were samples prepared? Three Points.

In the Diffusion Lab plant experiment, the salt could not diffuse in the time frame. Why were the cells not permeable to it? Three Points.

When it was first introduced, the endosymbiont theory found resistance because it was new and a bit weird. What was probably the other main reason for resistance? Three Points.

Why are chromosomes in drawings almost always shown in double-stranded form? Three Points.

If completely unwound, about how long is a human's DNA? Three Points.

What evidence supports the idea that a fusion event happened during human evolution? Three Points.

Why do viruses tend to produce lots of mutations? Three Points.

Explain the evolutionary significance of position effect. Three Points.

What organisms seem to be "okay" with polyploidy mutations? Three Points.




Michael McDarby.

SCI 135

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