Test Prep Test Prep Certifications OAT Questions & Answers

• Question 101:

  Which of the following is false in regards to food pyramids?

  A. As the pyramid ascends, there is less energy.

  B. As the pyramid ascends, there is less mass.

  C. As the pyramid descends, there is more mass.

  D. As the pyramid descends, there is fewer organisms.

  E. Algae would be found at the bottom of the pyramid.

  Correct Answer: D

  As the pyramid descends, there are more organisms.

• Question 102:

  Which of the following relationships is an example of commensalism?

  A. Virus – Host cell

  B. Bacteria in intestines of humans

  C. Nitrogen-fixing bacteria in legumes

  D. Spider crab and algae

  E. Suckerfish and shark

  Correct Answer: E

  The sucker fish (also known as Remora) attaches to the shark and eats what the shark discards and gets protection at the same time, all while the shark doesn't get any benefit (nor harm) from this attachment.

  The virus and host cell is a form of parasitism, and the other examples are all mutualism, where both organisms involved in the relationship benefit.

• Question 103:

  Which of the following would you not expect to find autotrophs?

  A. Aphotic Zone

  B. Photic Zone

  C. Intertidal Zone

  D. Littoral Zone

  E. There are autotrophs in all of the above

  Correct Answer: A

  The Aphotic Zone receives no sunlight, thus photosynthesis cannot occur, which means autotrophs cannot exist.

• Question 104:

  Primates are part which of the following classifications?

  A. Phylum

  B. Class

  C. Order

  D. Family

  E. Genus

  Correct Answer: C

  Primates are classified under order.

• Question 105:

  Which of the following is not associated with the clotting process?

  A. Thromboplastin

  B. Prothrombin

  C. Fibrinogen

  D. Fibrin

  E. All of the above are associated with the clotting process.

  Correct Answer: E

  All of the answer choices are involved in the clotting process. Thromboplastin aids in the conversion of prothrombin to thrombin, which then aids in the conversion of fibrinogen to fibrin.

• Question 106:

  Which of the following represents the most accurate passageway for air in humans?

  A. Mouth –andgt; Pharynx –andgt; Trachea –andgt; Bronchi –andgt; Bronchioles –andgt; Alveoli

  B. Mouth –andgt; Pharynx –andgt; Alveoli –andgt; Bronchi –andgt; Bronchioles

  C. Mouth –andgt; Esophagus –andgt; Bronchi –andgt; Bronchioles –andgt; Alveoli

  D. Mouth –andgt; Pharynx –andgt; Larynx –andgt; Esophagus –andgt; Alveoli –andgt; Bronchi

  E. Mouth –andgt; Alveoli –andgt; Bronchi –andgt; Trachea

  Correct Answer: A

  This is the most correct answer choice.

• Question 107:

  How many chromatids will there be with 20 homologous pairs of chromosomes?

  A. 40

  B. 60

  C. 80

  D. 100

  E. 10

  Correct Answer: C

  If there were 20 homologous chromosomes, it means there are 40 chromosomes and thus, 80 chromatids.

• Question 108:

  Which of the following is NOT a monosaccharide?

  A. Glucose

  B. Dextrose

  C. Sucrose

  D. Galactose

  E. B and C

  Correct Answer: C

  All other answers are indeed monosaccharides. Dextrose and glucose are the same thing.

• Question 109:

  Which of the following is false in regards to arthropods?

  A. They are a class of invertebrates.

  B. They possess a chitinous exoskeleton.

  C. All arthropods are aerobic organisms.

  D. It possess a tracheal system for respiration.

  E. None of the above.

  Correct Answer: E

  All characteristics in the answer choices are true of arthropods (insects).

• Question 110:

  The thyroid hormones triiodothyronine and thyroxine are obtained from the iodination of which amino acid?

  A. Tryptophan

  B. Lysine

  C. Threonine

  D. Phenylalanine

  E. Tyrosine

  Correct Answer: E

  The T3 and T4 hormones of the thyroid are derived from the iodination of tyrosine.