SCI 135 - Third Exam Spring 2015

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.  Crossing over happens during

_______ a. Sexual reproduction without genders            b. Mitosis            c. Meiosis I                 d. Meiosis II
                                                e. Many singers' later careers

        2.  Histones are a major part of

_______ a. Cell membranes                 b. RNA production                c. Nuclear envelopes
             d. Chromosome structure                e. Where they always tell you to kick a guy who's threatening you

        3.  Central vacuoles are used to

_______ a. Process secretions                 b. Support plants                c. Provide osmotic stability
              d. Reinforce nuclei                                e. Show where the middle is

        4.  What part of a population really changes during evolution?

_______ a. Gene pool         b. RNA types        c. Organelles         d. Environment        e. Where they order their pizza

        5.  Budding of arms and legs in an embryo would be controlled by

_______ a. Maternal hormones                 b. Yolk enymes                c. Mesoderm factors
              d. HOX genes                                            e. The latest X-Box

        6.  Chaperonins and prions are involved in

_______ a. Spindle production            b. Protein folding            c. Processing of messenger and transfer RNA
              d. DNA replication                            e. Most really dull parties

        7.  Which features are found in all cells?

________ a. Cell walls and chromosomes                    b. Cell membranes and cytoplasm
               c. Cell membranes and cell wall                    d. Chromosomes and nuclei
                                            e. Driver's-side air bags and radio

        8.  Worn-out cells often go through what process?

_______ a. Apoptosis             b. Replication            c. Metastasis             d. Rejuvenation
                                    e. Always complaining about their aches and pains

        9.  A cell involved in secretion should contain

________ a. Chromosomes             b. Ribosomes            c. Golgi bodies             d. All of these
                                        e. Oh, no! Not another one of these questions!!!

        10. Position effects are associated with

_______ a. Early embryo layout                                b. How easily genes can be expressed
              c. Where new genes come from                  d. Where codons start working
                                        e. Those aches you get in the morning

        11. An allele is a

________ a. A type of membrane attachment                b. Molecule used for energy storage
               c. The dissolved material in a solution            d. Variation in the code of a gene
                                        e. The newest flavor of alcoholic Snapple

        12.  Transfer RNA (tRNA) does its work

_______ a. In a ribosome             b. In the nucleus            c. In the nucleolus
              d. In the phospholipid bilayer                e. At the bus station



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.  Fresh-water fish use two different strategies to prevent osmotic damage - what are they?

2.  What two different structures do spindles attach to?

3.  Name two structures that make up the cytoskeleton.

4.  What are the two features that can make HIV escape mutants really dangerous?

5.  What are the two different general cell functions that happen during interphase?

6.  Briefly explain why addition or deletion point mutations are potentially worse than substitution point mutations.

7.  Give a basic function for each -


BONUS - What particular type of structure are these?

8.  What is a plasmid?

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

10. What are two stages of the cell cycle when cell division should not happen?

11. What is hybrid vigor?

12.  Researchers into telomerase mechanisms in aging -
Hope to get
what, particularly,
to happen?
May get what
13. What are two different ways that radiation exposure can bring about cell deaths?

14. What are two Kingdoms where all species have cell walls?

15. What was the "clinching" piece of evidence for the endosymbiont theory?

16. Give a basic set of differences between the chromosomes of -


17. If all you know is what is moving where, what specific detail will tell you if it's moving by active transport?


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 attached to the back of the exam, give the coded amino acid sequence.
Strand    T  A  C  C  C  A  A  A  G  T  A  G  G  C  A  T  C  C  A  T  A  G  G  G  A  C  T

mRNA ________________________________________________________________________________________


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




3.  Give three sets of differences between -




4.  Give four rules from the Cell Theory.



5.  What are four different types of proteins found in cell membranes?



6.  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.





7.  Give the names and basic functions of three molecular-complex organelles.





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.

How is apoptosis "supposed" to be pronounced? Three Points.

The surface-volume explanation for cell size limits only really applies to what cells? Three Points.

Cancers "turn on" genes / abilities that allow them to thrive and spread. For Two Points Each, give such specific abilities.

The endosymbiont theory was strongly resisted because it was new and odd, but what was the non-science likely reason for the resistance? Three Points.

What was the actual purpose of the salt in the diffusion lab salt solution? Three Points.

What is the counter-force to root pressure? Three Points.

For Mendel - why did he use pea plants? Three Points.

What is the most common feature that makes an allele recessive? This has nothing to do with the dominants. Three Points.

Why must all of the enzymes and other chemicals for mitosis be all made before the process begins? There are a couple of possible answers for this.

Why would it be bad if more of a sperm beyond its nucleus got into the egg cell? Three Points.

The timing of meiosis in egg cell production varies widely in animal groups. Why do the stages get delayed? Three Points.



SCI 135 

Michael McDarby