DAT Biology Practice Test 2025: 40 Questions

Last Updated on October 16, 2025

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 otherwise approach the multiple-choice questions in the Biology subtest and the entire Survey of Natural Sciences section in the best way possible.

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 has a total of 100 questions that 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) For a given diameter of an axon, one factor which increases the velocity of a nerve impulse is

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

3) The term motor unit refers to

4) At some stage of development, all chordates have

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

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

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

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

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

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

11) The initial step in the speciation process often involves

12) Which is the smallest organelle in the cell?

13) 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?

14) The human heart beat is initiated within the

15) Sexual and asexual reproduction usually differ in

16) 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

17) Which chiefly stimulates action of the respiratory center?

18) 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

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

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

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

22) 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?

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

24) Embryonic induction is a process in which

25) 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.

26) Starch, cellulose and glycogen are all

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

28) Fermentation

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

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

31) In respiration, oxygen

32) 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

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

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

35) Which statement is true of the archenteron?

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

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

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

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

40) Clotting of human blood

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