SCI 135 - Third Exam Spring 2018


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. During fertilization,

_______    a. Diploid cells get together                                b. Haploid cells get together
                c. One diploid cell joins one haploid cell               d. All of these can happen
                                    e. Fertility is, umm, made fertilaceous...

        2. Which cell function is closely associated with the presence of Golgi bodies?

_______    a. Storage         b. Secretion        c. Reproduction         d. Movement        e. Golgi-something

        3. Which is made up mostly of RNA and RNA components?

_______    a. Nucleolus         b. Chromosomes         c. Nucleus        d. Endoplasmic reticulum         e. RNA bisque

        4. What is done with a cell by endoplasmic reticulum is done by a human with their

_______    a. Muscle system         b. Nervous system        c. Circulation system         d. Digestive system
                                                                    e. Credit cards

        5. Under normal conditions, rare sodium ions move slowly from fresh-water into plant cells,
                            where the concentration is higher. This is done by

_______    a. Osmosis         b. Active transport         c. Diffusion        d. Passive transport         e. Plant elves

        6. In a double-stranded chromosome, a telomere can be found

_______    a. Holding each strand together                    b.  Side-by-side - it is the name of the strands
                c. Only during telophase                               d. At the end of each strand
                                e. Only if you really really want to find it

        7. For humans, which number of chromosomes would be polyploidy?

_______    a. 47         b. 92         c. 23         d. 46         e. 18 and-a-half

        8. The best explanation for why most genetic diseases are recessive involves

_______    a. Two DNA codes that can’t be used                b. Two DNA codes for non-working proteins
                c. DNA codes that don’t get passed on                d. All of these are involved
                                                e. Explaining what recessive means

        9. Histones are closely associated with

_______    a. DNA         b. Spindle fibers         c. Chlorophyll        d. Cell membranes         e. Lowstones

        10. In dividing cells, actual cell division (cytokinesis) occurs

_______    a. Only in telophase            b. In anaphase or telophase            c. In telophase or interphase
                d. In interphase, telophase, or anaphase            e. When cell parts get really angry with each other

        11. Cells usually secrete materials using

_______    a. Pigments         b. Exocytosis         c. Endocytosis         d. Spindles         e. Cell slime

        12. Position effects refers to where _____ are.

_______    a. Chloroplasts         b. Mitochondria         c. Ribosomes        d. Genes         e. The things I studied


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 two abilities must an HIV escape mutant have to be truly dangerous?


2. What are the two typical components of cytoskeleton?


3. For high chromosome numbers (compared to low numbers), give one specific -


4. What two areas of well-funded medical research are focused on telomerase?


5. The spindle fibers are made up of what particular cell structure?

6. What are two different ways that living things keep osmotic pressure from hurting them?


7. Give two things whose formation would be driven by HOX genes.


8. Some radiation can have huge effects on cells, even producing cancerous changes. What particularly does the radiation do inside the cells?

9. For the fluid mosaic model of cell membranes, describe the -
part -
part -

10. What is the function of microvilli?

11. Of the point mutations, an addition is much worse than a substitution. Explain why.

12. What, technically, is a gene?

13. What are two major functions of centromeres?


14. Briefly, what is the endosymbiont theory?

15. What is one thing that happens in Meiosis I that does not happen in mitosis?

16. Explain why a cell attacked by prions eventually stops working properly.


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. Using this DNA code give the messenger RNA sequence and, using the chart available with the exam, give the coded amino acid sequence.
Strand     T A C A G C C A A C T G G G C C C G T A G A C G A C T

mRNA ___________________________________________________________________________________


2. What are four different types of proteins that can be embedded in a cell membrane?


3. For the four phases of mitosis (so not the one between), name the phases in order and give one specific thing for each that happens particularly in that phase.





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




5. Give three sets of differences between -




6. For four different types of vesicles or vacuoles, give the name and function:




7. For the three basic layers of an early embryo, give -




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.

What is a mosaic? Three Points.

Why don’t animals have cell walls? Three Points.

To study cell membranes, red blood cells are popped using what simple approach? Three Points.

Why is it called a nuclear envelope? Three Points.

What was the most convincing piece of evidence to convince folks about the endosymbiont theory? Three Points.

Why did Mendel do his genetics work on pea plants? Three Points.

What is a Barr body? Three Points.

What type of proteins can be made using the splicing function? Three Points.

When cells turn into cancer, they spend less and less time in interphase. Why? Three Points.

Why is it important that only the nucleus from the sperm, and no other organelles, get into the egg cell during fertilization? Three Points.


SCI 135 

Michael McDarby