DAT Biology Practice Test 2026: 40 Questions

Last Updated on September 30, 2026

Dental Admission Test DAT Biology Practice Test 2025: 40 Questions. The biology knowledge you need for the DAT encompasses a wide variety of topics, including cell and molecular biology, diversity of life, vertebrate anatomy and physiology, developmental biology, genetics and evolution, and ecology and behavior.

Mastering biology on the DAT means not only memorizing biology vocabulary and facts but also learning to integrate your knowledge, make connections, and approach the multiple-choice questions in the Biology subtest and the entire Survey of Natural Sciences section in the best possible way.

Biology content appears in the Survey of Natural Sciences section, which contains the Biology, General Chemistry, and Organic Chemistry subtests. The Survey of Natural Sciences consists of 100 questions and must be completed in 90 minutes. Questions 1–40 are always related to biology, questions 41–70 are always associated with general chemistry, and questions 71–100 are always related to organic chemistry.

DAT Biology Practice Test: 40 Questions

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Dental Admission Test (DAT) Biology (1-40)

Dental Admission Test (DAT)
Topic: Biology
Total Questions: 40
Time Limit: 26.6 Minutes

1) The addition of potassium iodide as a nutritional supplement to common table salt would most directly affect the function of which of these glands?

2) For a given diameter of an axon, one factor which increases the velocity of a nerve impulse is

3) Fermentation

4) The initial step in the speciation process often involves

5) Clotting of human blood

6) A complex behavioral response to a specific cue or releaser, which is exhibited by all members of the species as a stereotyped response to the same stimulus, is known as a

7) Consider a pair of homologous human chromosomes. In this pair one would expect

8) An enzyme is added to an aqueous solution of ATP, DNA, albumen, fat and glycogen; the reaction mixture is incubated for 10 minutes. If an analysis of the mixture reveals the presence of all of the above compounds plus glucose, it can be concluded that the enzyme hydrolyzed some of the

9) In anaerobic glycolysis in muscle cells, one mole of glucose is oxidized to

10) Intracellular organelles that participate in metabolic oxidations involving H2O2 are called

11) Each of the following cell organelles have a membranous structure EXCEPT one. Which one is the EXCEPTION?

12) Under the five-kingdom classification, members of the kingdom Monera are generally separated from the members of all the other kingdoms by having

13) Starch, cellulose and glycogen are all

14) Which statement is true of the archenteron?

15) Organisms that obtain their energy from light can be termed

16) The two daughter cells formed by mitosis and cytokinesis have

17) Which statement concerning alleles is true for diploid organisms?

  1. At most only two alleles occur at a given locus in an organisms genome.
  2. Alleles occupy an identical locus in homologous chromosomes.
  3. Alleles of a given gene usually occur on non-homologous chromosomes.
  4. A single chromosome usually carries two alleles of each gene

18) Assuming no linkage, how many different kinds of gametes can be produced by an organism with the genotype AaBbcc?

19) The long-term natural process by which a pond eventually becomes a terrestrial community is referred to as

20) What cellular organelles would you expect to be absent from fungi?

21) Organisms that have the characteristics of radial symmetry, water vascular system, a spiny skin, and are found exclusively in a marine habitat would be in which phylum?

22) Embryonic induction is a process in which

23) In human beings, color blindness is controlled by an X-linked recessive allele. In a cross involving this X-linked trait, the male parent has normal color vision, but the female parent is a carrier. What are the chances (in %) that a male offspring will inherit color blindness?

24) Sexual and asexual reproduction usually differ in

25) The term motor unit refers to

26) Of the following, which group of invertebrates is apparently most closely related to primitive vertebrates?

27) In watermelons, the unlinked genes for green color (G) and for short length (S) are dominant over alleles for striped color (g) and long length (s). Predict the phenotypes and their ratios for the cross Ggss x ggSs.

28) The movement of water soluble molecules through cell membranes, from higher to lower concentrations, by attachment to a carrier protein, describes

29) As far as their products are concerned, all biosynthetic reactions in living cells result in

30) Each of the following changes the frequency of alleles in a population EXCEPT one. Which one is the EXCEPTION?

31) In respiration, oxygen

32) At some stage of development, all chordates have

33) Of the following, the rate and type of cleavage occurring after fertilization would be most affected by the

34) In the nephron of the kidney, filtration occurs between

35) A segment of DNA with the sequence GGCATTAGG would be transcribed into a messenger RNA segment with the sequence

36) Which chiefly stimulates action of the respiratory center?

37) Of the germ layers comprising the early human embryo, which one forms most of the central nervous system?

38) Each of the following is synthesized by the anterior lobe of the pituitary gland of vertebrates EXCEPT one. Which one is the EXCEPTION?

39) The human heart beat is initiated within the

40) Which is the smallest organelle in the cell?

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