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Unit Two Practice Exam

Cells that manufacture many proteins would have an especially large amount of:

A. lysosomes

B. ribosomes

C. vacuoles

D. chloroplasts

E. centrioles

 

_______________ are eukaryotes

A. animals

B. plants

C. fungi

D. A and B

E. all of the above

 

Which of the following is the correct path indicating the translation of DNA into a protein exported out of a cell

A. DNA in nucleus → RNA through nuclear pore→ Ribosome → Golgi Apparatus → Vesicle → Exocytosis

B. DNA in nucleolus → RNA into nucleus → Ribosome → Smooth ER → Golgi Apparatus → Vesicle Exocytosis

C. DNA in nucleus → Chromosomes in nucleus → Rough ER → Smooth ER → Vesicle → Exocytosis

D. DNA in nucleus → RNA in smooth ER → Golgi apparatus → Vesicle → Exocytosis

E.  None of the above

 

An unknown organelle is found to take in Oxygen and release Carbon Dioxide and ATP.  The organelle is most likely:

A. a chloroplasts

B. a mitochondrion

C. a lysosome

D. a peroxisome

E. A or B

 

Lysosomes:

A. Are part of the endomembrane system

B. Contain hydrolytic enzymes

C. Help the cell recycle materials

D. A, B and C

E. Two of the above

 

The 9+2 arrangement refers to

A. Centrioles

B. Flagella

C. Cilia

D. B and C

E. A, B and C

  

The __________ helps assemble and organize microtubules

A. Flagellum

B. Basal body

C. Centrosome

D. Nucleus

E. Intermediate filament

  

A membrane is abnormally fluid.  This could be caused by:

A. Extra cholesterol in the membrane

B. high temperatures

C. unsaturated fatty acids

D. A, and B

E. A, B and C

 

Which is the correct arrangement from fastest to cross a membrane to slowest

A. K+, CH4, H2O, Glucose

B. CH4, H2O, Glucose, K+

C. H2O, CH4, K+, Glucose

D. K+, H2O, CH4, Glucose

E. Glucose, K+, CH4, H2O

 

Two solutions are separated by a semi-permeable membrane.  One is 1.0M sucrose, the other is 1.5M lactose.  The net movement of water will be towards:

A. The lactose

B. The sucrose

C. It depends on the molecular weight of sucrose and lactose

D. There will be no net movement of water

E. You have to know the solubility of sucrose and lactose to answer this problem

 

A plant is placed in pure distilled water.  The plant will

A. wilt

B. be destroyed when its cells burst

C. plasmolyze

D. Become turgid

E. It depends on the concentration inside the plant

 

The sodium-potassium pump:

A. Is a form of facilitated diffusion

B. Is a form of active transport

C. Generates a membrane potential

D. Requires Energy

E. B, C and D

 

Integral proteins are __________ while peripheral proteins are____________

A. hydrophilic, hydrophobic

B. transmembrane, located outside the membrane

C. hydrophilic, amphipathic

D. hydrophobic, amphipathic

E. located outside the membrane, transmembrane

 

A cellular receptor leads to a short transduction of only a few second messengers.  It is most likely:

A. A G-protein receptor

B. A tyrosine-kinase receptor

C. A transmembrane protein

D. A and C

E. B and C

A kinase:

A. hydrolyzes macromolecules

B. phosphorylates proteins

C. is an enzyme

D. A and C

E. B and C

 

Which is a correct signal transduction pathway:

A. Receptor → cAMP → IP3 → Ca++ → Response

B. Receptor → IP3 → Ca++ → cAMP → Response

C. Receptor → cAMP → Protein kinase A → Other protein kinases → response

D. Receptor → IP3 → Protein kinase A → Other protein kinases → response

E. Receptor → IP3 → cAMP → Ca++ → Protein Kinase A → Response

 

Cellular responses include all of the following except:

A. Turning on of genes

B. Opening or closing a channel

C. Cytoskeleton movement

D. Enzyme activation

E. All of these are possible cellular responses

 

Tyrosine Kinase consists of:

A. 7 transmembrane helices

B. 2 polypeptide subunites

C. An enzyme that phosphorylates the tyrosine amino acids

D. An ion channel

E. B and C

 

All of the following are functions of membrane proteins except:

A. Signal reception

B. Enzymatic activity

C. Facilitated diffusion

D. Active transport

E. Synthesis of membrane phospholipids

 

Key 

    
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