Test Prep Test Prep Certifications OAT Questions & Answers

• Question 141:

  Which of these classes is incorrectly matched with the animal?

  A. Gastropoda – Slug

  B. Aves – Golden Eagle

  C. Arachnida – Scorpion

  D. Reptilia – Green Sea Turtle

  E. None of the above

  Correct Answer: E

  All of the classes are indeed matched correctly to the animal.

• Question 142:

  Which of the following are not pyrimidines?

  A. Cytosine

  B. Thymine

  C. Uracil

  D. Guanine

  E. C and D

  Correct Answer: D

  Uracil, Cytosine and Thymine are pyrimidines. Adenine and Guanine are purines.

• Question 143:

  An enzyme without a co-factor is called:

  A. Holoenzyme

  B. Apoenzyme

  C. Isoenzyme

  D. Metalloenzyme

  E. Coenzyme

  Correct Answer: B

  This is the definition of an apoenzyme. A holoenzyme is an apoenzyme plus the co-factor. Be aware of basic types of enzymes and their definitions.

• Question 144:

  Carbohydrate digestion begins in the ______, while protein digestion begins in the ______?

  A. Mouth / Mouth

  B. Stomach / Mouth

  C. Stomach / Stomach

  D. Small Intestine / Stomach

  E. Mouth / Stomach

  Correct Answer: E

  Carbohydrate digestion begins in the mouth with the initial breakdown via salivary amylase. Proteins begin being denatured in the stomach via hydrochloric acid and the enzyme pepsin.

• Question 145:

  Which of the following possesses a cell wall?

  A. Plants

  B. Bacteria

  C. Fungi

  D. Protists

  E. All of the above

  Correct Answer: E

  All of the answer choices do indeed a contain cell wall. The anatomy of the cell of various kingdoms should be known.

• Question 146:

  In times of starvation, which of the following would NOT be expected to be seen in high quantity in the blood?

  A. Glucagon

  B. Ghrelin

  C. Ketone bodies

  D. Insulin

  E. B and D

  Correct Answer: D

  In times of starvation, glucagon is released by the alpha cells of the pancreas to signal to the liver to break down stored glycogen into free glucose molecules that can enter the blood stream where they are lacking. Ghrelin plays a role in signaling the urge to be `hungry'. Ketone bodies are released by the liver in times of starvation (especially carbohydrate starvation) where they are picked up by cells, converted into acetyl-CoA, entering the TCA cycle.

• Question 147:

  Which of the following statements is FALSE regarding C3 and C4 photosynthesis?

  A. The CO2 is incorporated into a 3-carbon compound in C3.

  B. In C3, the CO2 is directly fed into the Calvin Cycle.

  C. In C3, RUBISCO is used to fix CO2.

  D. The C3 and C4 reactions are temporally separated.

  E. All of the above are true statements.

  Correct Answer: E

  All of the above are accurate statements.

• Question 148:

  Hormones composed of steroids are synthesized in which of the following organelles in the cell?

  A. Smooth ER

  B. Rough ER

  C. Golgi apparatus

  D. Ribosomes

  E. Peroxisomes

  Correct Answer: A

  The smooth ER is responsible for synthesizing components of the plasma membrane along with lipids (steroids) such as testosterone that act as hormones in the body. It is critical to be familiar with the cell organelles and their function as it is expected to be a question in the biology section.

• Question 149:

  Which of the following hormones is associated with contractions during childbirth?

  A. Prolactin

  B. Ghrelin

  C. Gibberellin

  D. Oxytocin

  E. Growth Hormone

  Correct Answer: D

  Oxytocin is associated with contractions of the uterus during childbirth in a positive signal feedback mechanism. Be sure to understand all the common hormones of the hypothalamus, anterior and posterior pituitary, androgen and hormones associated with the digestive system.

• Question 150:

  An mRNA strand has the following sequence: 5' CUAUUG 3'. Identify the DNA coding strand:

  A. 5' CAATAG 3'

  B. 5' GAUAAC 3'

  C. 5' CTATTG 3'

  D. 5' CUAUUG 3'

  E. 5' CGCTTA 3'

  Correct Answer: C

  The coding strand is the DNA strand that is not transcribed into mRNA. The coding strand is identical to

  the mRNA strand, except with T's instead of U's. The template strand (choice 5' CAATAG 3') is what gets

  transcribed into mRNA.

  Understand the difference between coding and template strands as well as base-pair rules.