Saturday, October 10, 2020

GENED SCIENCE TEST

 

Macromolecules & Enzymes

              1. Which term is the monomer for carbohydrates?

  a.

monosaccharide

b.

Disaccharide

c.

Starch

d.

Lipids

 

              2. What happens to an enzyme when placed in boiling water?

a.

It becomes sugar

b.

It is denatured

c.

It becomes stronger

d.

It speeds up the rate of reaction

 

              3. Choose the pair of terms that correctly completes this sentence:

Nucleotides are to __________ as ____________ are to proteins.

a.

nucleic acids; amino acids

b.

amino acids; polypeptides

c.

glycosidic linkages; polypeptide linkages

d.

genes; enzymes

 

              4. Which of following statements is true about catalysts

a.

Catalysts slow down the rate of chemical reactions

b.

All enzymes are catalysts

c.

All catalysts are enzymes

d.

All catalysts lower the activation energy of a chemical reaction

 

              5. The active site is where __________________.

a.              The substrate  binds to the enzyme

b.   Monosaccarides become proteins

c.              Sugar dissolves in water

d.   Enzymes are denatured in a reaction

 

              6. Which of the following is NOT an example of a protein?

a.

Enzyme

b.

Hemoglobin

c.

Glucose

d.

Egg whites

 

              7. What is the term used to describe the energy needed to get a reaction started?

a.

Adhesion energy

b.

Cohesion energy

c.

Activation energy

d.

Chemical energy

 

              8. Which of the following is NOT a carbohydrate?

a.

Chitin

b.

Cellulose

c.

Lactase

d.

Starch

 

              9. Enzymes affect reactions in living cells by increasing the

a.

b.

c.

d.

    

Products of the reaction                 

Rate of product formation

pH of the reaction

Temperature of the reaction        

 

              10.   A substance that accelerates the rate of a chemical reaction is called a (an)

a. Catalyst              

b. Lipid                     

c. Molecule                

d. Element

 

              True or False 

              11. An enzyme increases the rate of a reaction by decreasing the activation energy

a.

True

b.

False

 

 

              12. A product binds to an enzyme’s active site.

a.

True

b.

False

 

              13. Substances present at the beginning of a chemical reaction are called products.

a.

True

b.

False

 

              14. DNA controls the sequence and formation of amino acids.

a.

True

b.

False

 

              15.     The name of an enzyme usually ends in “-ase”

a.

True

b.

False

 

 

              16. Two substances are combined and a new color is produced. This DOES NOT provide evidence that a chemical reaction took place.

a.

True

b.

False

 

              17. How does an enzyme influence a biological reaction?

a.

It reduces the speed or rate of the reaction

b.

It speeds up the rate of the reaction

c.

It does not affect the reaction

d.

It changes the products into reactants

              18. In humans, and other multicellular organisms, which substance is the main energy source?

a.

Carbohydrates

b.

Fats

c.

Nucleic Acid

d.

Water

 

                   19. Amino acids are the building blocks of which macromolecule?

a.    a. carbohydrates                

b.    b. DNA          

c.     c. Lipids          

d.    d. Proteins

 

               20. An organism’s genetic information is stored in which type of macromolecule?

a. Nucleic Acid         

b. Carbohydrates         

c. Lipids          

d. Proteins

 

21. Which of the following is NOT a function of proteins?

a. Build tissues such as bone and muscle

b. Transport molecules such as oxygen

c. Control the rate of reactions and regulate cell processes

d. Store and transmit genetic information

 

 22. Identify the reactants (s) in the chemical reaction CO2 + H2O  à H2CO3.

a. CO2, H2O, and H2CO3                

b. CO2, H2O          

c. H2CO3                 

d. CO2 only

 

Mitosis and Meiosis Quiz

 

  1. Mitosis is a cellular process that produces
    1. Two genetically identical daughter cells
    2. Four genetically identical daughter cells
    3. Two similar, but not genetically identical daughter cells
    4. Four similar, but not genetically identical daughter cells

 

  1. The first stage of mitosis where chromatin condenses to form chromosomes is
    1. Interphase
    2. Prophase
    3. Metaphase
    4. Anaphase
    5. Telophase

 

  1. The part of the cell cycle where a cell spends most of the time carrying on metabolism
    1. Interphase
    2. Prophase
    3. Metaphase
    4. Anaphase
    5. Telophase

 

  1. The stage of mitosis where the chromosomes line up at the cells’ equator
    1. Interphase
    2. Prophase
    3. Metaphase
    4. Anaphase
    5. Telophase

 

  1. The stage of mitosis where the spindle fibers pull the chromatids toward the centrioles
    1. Interphase
    2. Prophase
    3. Metaphase
    4. Anaphase
    5. Telophase

 

  1. The stage of mitosis shown in diagram 1.
    1. Interphase
    2. Prophase                                                    Diagram 1.
    3. Metaphase
    4. Anaphase
    5. Telophase  


7. The stage of mitosis shown in diagram 2

.

a.    Interphase

b.   Prophase

c.    Metaphase

d.   Anaphase

e.    Telophase

 

 

                               Diagram 2.

 

 

 

      8. A centriole is

           a. A cell structure that produces chromatin

           b. A cell structure that produces chromosomes

c. A cell structure that produces centromeres

d. A cell structure that produces spindle fibers

 

      9. What is the function of a centromere?

           a. To hold sister chromatids together

           b. To pull the chromosomes

           c. To push the chromosomes

           d. a and c

 

     10. How many chromosomes do human somatic (body) cells have?

           a. 23

           b. 45

           c. 46

           d. 47 

 

 11. How many chromosomes do human gametes (egg or sperm) have?

      a. 23

      b. 45

      c. 46

      d. 47

 

12. How many gametes form from a parent cell that undergoes meiosis I & II?

     a. 1

     b. 2

     c. 3

     d. 4

 

13. Cytokinesis is the division of

      a. A cell

      b. Chromosomes

      c. Cytoskeleton

      d. Cytoplasm

14. What factor(s) limit cell size?

      a. DNA

      b. Diffusion

      c. Surface area to volume ratio

      d. All of the above

      e. b and c only

 

15. What is a gene?

     a. A malignant growth resulting from uncontrolled cell division

     b. A segment of DNA that controls the production of a protein

     c. An arrangement of chromosomes used to detect genetic abnormalities

 

16. What is cancer?

     a. A malignant growth resulting from uncontrolled cell division

     b. A segment of DNA that controls the production of a protein

     c. An arrangement of chromosomes used to detect genetic abnormalities

 

17. What is a karyotype?

     a. A malignant growth resulting from uncontrolled cell division

     b. A segment of DNA that controls the production of a protein

     c. An arrangement of chromosomes used to detect genetic abnormalities

 

18. Gametes have the ______ number of chromosomes

     a. Diploid

     b. Haploid

     c. Polyploid

 

19. A zygote has the ______ number of chromosomes

     a. Diploid

     b. Haploid

     c. Polyploid

 

20. Why are there two sets of phases in meiosis?

     a. To produce double the number of chromosomes in each gamete

     b. To produce half the number of chromosomes in each gamete

     c. To produce triple the number of chromosomes in each gamete




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