OAT Practice Questions: OAT Practice Tests & Exam Review for the Optometry Admission Test

179 Pages·2013·0.786 MB·English

by  OAT Exam Secrets Test Prep Team

OAT
Practice Questions

OAT Practice Tests & Exam Review for the
Optometry Admission Test
Table of Contents
Practice Test #1
Answers and Explanations #1
Practice Test #2
Answers and Explanations #2
Practice Test #1
Natural Science
Biology
1. The breakdown of a disaccharide releases energy which is stored as ATP. This
is an example of a(n)
1. Combination reaction
2. Replacement reaction
3. Endothermic reaction
4. Exothermic reaction
5. Thermodynamic reaction

2. Which of the following molecules is thought to have acted as the first enzyme
in early life on earth?
a. Protein

b. RNA

c. DNA

d. Triglycerides

e. Phospholipids

3. Cyanide is a poison that binds to the active site of the enzyme cytochrome c and
prevents its activity. Cyanide is a(n)
1. Prosthetic group
2. Cofactor
3. Coenzyme
4. Inhibitor
5. Reverse regulator
4. In photosynthesis, high-energy electrons move through electron transport chains
to produce ATP and NADPH. Which of the following provides the energy to
create high energy electrons?
1. NADH
2. NADP+
3. O2
4. Water
5. Light

5. The synaptonemal complex is present in which of the following phases of the
cell cycle?
1. Metaphase of mitosis
2. Metaphase of meiosis I
3. Telophase of meiosis I
4. Metaphase of meiosis II
5. Telophase of meiosis II
6. Which type of plant has leaves with parallel veins?
a. Monocots

b. Dicots

c. Angiosperms

d. Gymnosperms

e. Nonvascular plants

7. In ferns, the joining of egg and sperm produces a zygote, which will grow into
the
a. Gametophyte

b. Sporophyte

c. Spore
d. Sporangium

e. Seedling

Questions 8 and 9 pertain to the following diagram of a complete, perfect flower

8. The structure in which microspores are produced.
a. 1

b. 2

c. 3

d. 4

e. 5

9. The structures composed solely of diploid cells
a. 1, 2, and 3

b. 2, 3, and 4

c. 3, 4, and 5

d. 1, 4, and 5

e. 1, 2, and 4

10. Which of the following processes is an example of positive feedback?
1. High CO2 blood levels stimulate respiration which decreases blood CO2
levels
2. High blood glucose levels stimulate insulin release, which makes muscle and
liver cells take in glucose
3. Increased nursing stimulates increased milk production in mammary glands
4. Low blood oxygen levels stimulate erythropoietin production which
increases red blood cell production by bone marrow
5. Low blood calcium levels stimulate parathyroid hormone release from the
parathyroid gland. Parathyroid hormone stimulates calcium release from
bones.

11. In which of the following stages of embryo development are the three primary
germ layers first present?
a. Zygote

b. Gastrula

c. Morula

d. Blastula

e. Coelomate

12. In the food chain below, vultures represent
grass → cow → wolf → vulture

a. Scavengers

b. Detritivores

c. Primary carnivores

d. Herbivores

e. Secondary consumers

13. A population of 1000 individuals has 110 births and 10 deaths in a year. Its
growth rate (r) is equal to
a. 0.01 per year

b. 0.1 per year

c. 0.09 per year

d. 0.11 per year

e. 0.009 per year

14. When a population reaches its carrying capacity
a. Other populations will be forced out of the habitat

b. Density-dependent factors no longer play a role

c. Density-independent factors no longer play a role

d. The population growth rate approaches zero

e. The population size begins to decrease

15. Darwin’s idea that evolution occurs by the gradual accumulation of small
changes can be summarized as
a. Punctuated equilibrium

b. Phyletic gradualism

c. Convergent evolution

d. Adaptive radiation

e. Sympatric speciation

16. Human predation has cause the population of cheetahs to decline dramatically.
Changes in allele frequencies in the remaining population of cheetahs would most
likely be due to
a. Mutation
b. The bottleneck effect

c. The founder effect

d. Gene flow

e. Natural selection

17. Which of the following carbohydrate polymers serves as an energy storage
molecule in plants?
a. Chitin

b. Cellulose

c. Starch

d. Glycogen

e. Phospholipids

18. All of the following molecules are soluble in water except:
a. Polysaccharides

b. Hydroxyl groups

c. Carboxylic acids

d. Polypeptides

e. Triglycerides

19. The diagram below depicts a metabolic pathway. When product D
accumulates, the production of product C decreases, D is an inhibitor of which
enzyme?
1. A′
2. B′
3. C′
4. D′
5. E′

20. Which of the following is a characteristic of an enzyme cofactor?
a. It binds to an enzyme’s active site

b. It is consumed in the enzymatic reaction

c. It inhibits the enzymatic reaction

d. It binds to an allosteric site

e. It is covalently bound to the enzyme

21. In photosynthesis, high-energy electrons in Photosystem II are transferred
along an electron transport chain and eventually end up in high-energy molecules
used in the Calvin Cycle. Which molecule provides electrons to replace those lost
by Photosystem II after light stimulation?
a. NADPH

b. H2O

c. ATP

d. CO2

e. FADH2

22. Auxin stimulates stem elongation and is involved in the process of
phototropism. If plants bend toward a light source, in which region of the plant is
auxin most likely to be found?
1. The sunny side of a stem
2. The shaded side of a stem
3. The top of a shoot