1. Premed Biology Final Review
Practice Test 3
Premed Biology
Final Review

2. Question 1 A molecule of DNA contains all of the following EXCEPT:
A. deoxyribose sugars
B. polypeptide bonds
C. phosphodiester bonds
D. nitrogenous bases

3. Question 2
Which of the following is a carbohydrate polymer that is stored. in plants and digestible by animals?
A. starch
B. glycogen
C. cellulose
D. glucose

4. Question 3
Excessive amounts of nitrogen are found in the urine of an individual who has experienced a period of extended fasting. This is most likely due to:
A. glycogenolysis in the liver.
B. the breakdown of body proteins.
C. lipolysis in adipose tissue.
D. a tumor on the posterior pituitary causing excessive ADH secretion

5. Question 4
Penicillin interferes with peptidoglycan formation. Penicillin most likely inhibits bacterial growth by disrupting the production of: A. bacterial plasma membranes B. prokaryotic cell walls C. the bacterial nucleus D. bacterial ribosomes

6. Question 5
The lipopolysaccharide layer outside the peptidoglycan cell wall of a gram negative bacterium:
A. absorbs and holds gram stain.
B. protects the bacterium against certain antibiotics.
C. does not contain phospholipids.
D. allows the bacterium to attach to solid objects.

7. Question 6 All of the following are composed of microtubules EXCEPT:
A. the tail of a sperm cell
B. the spindle apparatus
C. the cilia of the fallopian tubes
D. the flagella of bacteria

8. Question 7 In humans, most chemical digestion of food occurs in the:
A. mouth
B. stomach
C. duodenum
D. ileum

9. Question 8
Essential amino acids must be ingested because they cannot be synthesized by the body. In what form are these amino acids likely to enter the blood stream? A. single amino acids B. dipeptides C. polypeptides D. proteins

10. Question 9 Salivary a-amylase begins the digestion of: A. lipids
B. nucleic acids
C. proteins
D. carbohydrates

11. Question 10 One function of the large intestine is: A. to absorb water
B. to secrete excess water
C. to digest fat
D. to secrete urea

12. Question 11
Which of the following reaction types is common to the digestion of all macronutrients?
A. hydrolysis
B. reduction
C. glycolysis
D. phosphorylation

15. Question 12
Free fatty acids do not dissolve in the blood, so they must be transported within the body bound to protein carriers. The most likely explanation for this is:
A. Blood is an aqueous solution and only hydrophobic compounds are easily dissolved.
B. Blood is an aqueous solution and only hydrophilic compounds are easily dissolved.
C. Blood serum contains chylomicrons which do not bind to fatty acids.
D. Blood serum is lipid based and the polar region of a fatty acid will not be dissolved.

16. Question 13
A stomach ulcer may increase the acidity of the stomach. The stomach cells most affected by a stomach ulcer are:
A. goblet cells
B. parietal cells
C. chief cells
D. G cells

17. Question 14
Cholera is an intestinal infection that can lead to severe diarrhea causing profuse secretion of water and electrolytes. A glucose-electrolyte solution may be administered orally to patients suffering from cholera. What is the most likely reason for mixing glucose with the electrolyte solution?
A. When digested, glucose increases the strength ofthe
patient
B. The absorption of glucose increases the uptake of
electrolytes
C. Glucose is an electrolyte
D. Glucose stimulates

18. Question 15 Carbon dioxide partial pressure:
A. increases in the blood as it travels from the systemic venules to the inferior vena cava.
B. increases in the blood as it travels from the pulmonary arteries to the pulmonary veins.
C. is greater in the blood in the systemic capillary beds than in the alveoli of the lungs.
D. .is greater in the blood in the systemic capillary beds th~Ul in the systemic tissues.

19. Question 16
The net result of aerobic respiration can be summarized most accurately as:
A. the oxidation of glucose.
B. the reduction of glucose.
C. the elimination of glucose.
D. the lysis of glucose.

20. Question 17
Which of the following gives the net reaction for glycolysis? A. Glucose + 4 ADP  pyruvate + 2 ATP B. Glucose + 2 ADP + 2 P; + 2 NAD+ 2 pyruvate +2ATP + 2 NADH C. Glucose + 02 CO2 + H ATP D. Glucose + 02 2pyruvate + 2 ATP + 2 NADH

21. Question 18
Pancreatic enzymes are relea<;ed from the pancreas in an inactive form called a zymogen. Which of the following activates the zymogen form of pancreatic lipase?
A. bile salts
B. trypsin
C. low pH
D. high pH

22. Question 19
A patient that has had his pancreas surgically removed would most likely need to supplement his diet with all ofmthe following enzymes EXCEPT:
A. lactase
B. lipase
C. amylase
D. proteases

23. Question 20
Which of the following is LEAST likely to increase the breathing rate of an individual?
A. increased pH in the blood
B. low oxygen levels in the blood
C. increased muscle activity
D. increased CO2 levels