DAT Biology Practice Test 2026: 40 Questions

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

2) Which chiefly stimulates action of the respiratory center?

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

4) In respiration, oxygen

5) Which is the smallest organelle in the cell?

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

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

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

9) 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

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

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

12) The term motor unit refers to

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

14) The initial step in the speciation process often involves

15) 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?

16) 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

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

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

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

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

21) Starch, cellulose and glycogen are all

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

23) Clotting of human blood

24) Sexual and asexual reproduction usually differ in

25) 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

26) 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.

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

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

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

30) Which statement is true of the archenteron?

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

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

33) Embryonic induction is a process in which

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

35) The human heart beat is initiated within the

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

37) Fermentation

38) At some stage of development, all chordates have

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

40) 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?