SCI 135 - Third Exam Spring 2016
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.  After DNA replication,

_______    a. Both chromatids are new material                    b. One chromatid is new and one is original
                c. Each chromatid is half new and half original      d. The original has just split into two pieces
                                        e. The DNA has to take a long hot shower

            2.  Prokaryotes all have the same

_______    a. Genes         b. Alleles         c. Homologous pairs        d. Chromosome number
                                                        e. Weird names

            3.  Cancer cells gain the ability to crawl by activating genes for

_______    a. Muscle proteins         b. Cilia         c. Pseudopods        d. Active transport
                                                        e. Crawly stuff

            4.  Chromosomes often come in homologous pairs, matched by

_______    a. What cell they’re in             b. The same genes            c. What nucleus they’re in
                d. The same alleles                                    e. An online dating site

            5.  What structures are most responsible for keeping house plants upright?

_______    a. Cell wall & cell membrane                    b. Nucleus & nucleolus
                c. Cell wall & central vacuole                    d. Contractile vacuole & chloroplast
                                            e. Those little tie-on sticks

            6.  Saliva is secreted by salivary glands – those cells should be full of

_______    a. Cell walls         b. Golgi bodies        c. Endoplasmic reticulum         d. Nucleoli
                                                    e. Um, slimy juice-?

            7.  Which two organelles are strongly associated with RNA?

_______    a. Nucleus and golgi body                      b. Nucleolus and ribosome
                c. Ribosome and lysosome                     d. Vesicle and vacuole
                    e. Well, how strongly? RW friends or Facebook friends?

            8.  A single nucleotide change in a codon is likely to change what about the coded protein?

_______    a. Nothing significant                b. Its basic function to something different
                c. It won’t work at all                d. It will work better
                                    e. Its font preferences

            9.  Cellular materials are recycled

_______    a. By endocytosis         b. By exocytosis        c. In lysosomes         d. In peroxisomes
                                e. When you’ve paid a nickel for the packaging

            10. In an aquarium, the filters keep the concentration of waste molecules

_______    a. Lower than the concentration inside the fish cells
                b. Equal to the concentration inside the fish cells
                c. Higher than the concentration inside the fish cells
                d. All of the above, depending upon the temperature
                e. Oh, it’s a problem-solving question. *Whimper*

            11. Chaperonins

_______    a. Control DNA replication                       b. Help proteins fold properly
                c. Control membrane permeability             d. Control secretions
                                            e. Are cellular buzzkill

            12. For any particular gene, how many copies should be in our nucleus?

_______    a. One         b. Two         c. 23        d. 46         e. Not enough to deal with this


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.  Cells with lots of microvilli are probably involved in what two different jobs?


2.  The two areas of medical research very interested in telomerase:


3.  Why is it called a nuclear envelope, rather than just a nuclear membrane?

4.  Briefly explain the endosymbiont theory.

5.  What two organelles are associated with the endosymbiont theory?


6.  For a low chromosome number, compared to a high chromosome number -

7.  Transfer RNA has attachment points for what two other molecules?


8.  In a cell, what does facilitated diffusion need that “regular” diffusion does not?

9.  What is meant by genetic linkage?

10. In order to be truly dangerous, HIV escape mutants must have what two features?


11. What is apoptosis?

12. Briefly explain how dominant and recessive alleles work. What produces the effect?

13. Biologically, what is meant by the term gender?

14. Two structures involved in cytoskeleton:


15. What, technically, is a gene?


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 between -




2.  Using this DNA code give the messenger RNA sequence and, using the chart attached to the back of the exam, give the coded amino acid sequence.
Strand     T  A  C  C  A  T  A  G  T  T  G  G  G  A  T  C  C  A  C  A  G  T  C  G  A  T  C

mRNA _________________________________________________________________________________________


3.  What are three different ways that fresh-water organisms deal with osmosis?



4.  Define these terms associated with chromosome structure:

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




6.  Fill in with labels at the ends of the arrows, whatever animal cell structure the arrow is pointing at.

This was a hand-drawn picture of a cell with various organelles pointed at.


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.

Plants use root pressure to move water up to maybe a couple of feet in height. Why not higher? Three Points.

In the lab, what is the particular role played by the salt in the salt solution? Three Points.

Why were the plant cells not permeable to salt? Three Points.

What are “non-standard” ways that pseudopods get used? Two Points Each.

Which cell structure was compared to building factories near the Thruway? Three Points.

Evolutionary studies tend to use mitochondrial DNA. Why? Three Points.

Why did Mendel, the granddaddy of genetics, wind up working with pea plants? Three Points.

Many of the sperm in any sample are messed up, dysfunctional cells. Why? Three Points.

What organism uses its polar bodies for “another” purpose? Three Points.

What are the molecular zombies of the cell? Three Points.



SCI 135 

Michael McDarby