DAT Biology (Natural Sciences) Practice Questions

Practice questions

1. The hydrogen bonds in a water molecule make water a good?

a. Solvent for lipids
b. Participant in replacement reactions
c. Surface for small particles and living organisms to move across
d. Solvent for polysaccharides such as cellulose
e. Example of an acid

2. The breakdown of a disaccharide releases energy which is stored as ATP. This is an example of a(n)

a. Combination reaction
b. Replacement reaction
c. Endothermic reaction
d. Exothermic reaction
e. Thermodynamic reaction

3. 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

4. All but which of the following processes are ways of moving solutes across a plasma membrane?

a. Osmosis
b. Passive transport
c. Active transport
d. Facilitated diffusion
e. Endocytosis

5. Prokaryotic and eukaryotic cells are similar in having which of the following?

a. Membrane-bound organelles
b. Protein-studded DNA
c. Presence of a nucleus
d. Integral membrane proteins in the plasma membrane
e. Flagella composed of microtubules

6. Which of the following parts of an angiosperm give rise to the fruit?

a. Pedicel
b. Filament
c. Sepal
d. Ovary
e. Meristem

7. Which of the following is an example of the alternation of generations life cycle?

a. Asexual reproduction of strawberries by runners
b. Annual plants that live through a single growing season
c. Ferns that have a large diploid and a diminutive haploid stage
d. Insects that have distinct larval and adult stages
e. Reptiles that have long periods of dormancy and metabolic inactivity

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

Questions 8 & 9 Diagram


8. The structure in which microspores are produced is:

a. 1
b. 2
c. 3
d. 4
e. 5

9. The structures composed solely of diploid cells are:

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 extraembryonic membranes is an important source of nutrition in many non-human animal species but NOT in humans?

a. Amnion
b. Allantois
c. Yolk sac
d. Chorion
e. Placenta

11. On a standard biomass pyramid, level 3 corresponds to which trophic level?

a. Producers
b. Decomposers
c. Primary consumers
d. Primary carnivores
e. Secondary carnivores

Grass → Cow → Wolf → Vulture

12. In the food chain above, vultures represent

a. Scavengers
b. Detritivores
c. Primary carnivores
d. Herbivores
e. Secondary consumers

13. The diagram below represents the three types of survivorship curves, describing how mortality varies as species age. Which of the following species is most likely to exhibit Type I survivorship?

Question 13 Diagram

a. Frogs
b. Oysters
c. Salmon
d. Dolphins
e. Shrimp

14. 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

15. Which of the following is NOT a natural dispersal process that would lead to species colonization on an island?

a. Mussels carried into a lake on the hull of a ship
b. Drought connecting an island to other land
c. Floating seeds
d. Animals swimming long distances
e. Birds adapted to flying long distances

16. Which of the following is an example of a density-dependent limiting factor?

a. Air pollution by a factory
b. The toxic effect of waste products
c. Nearby volcanic eruptions
d. Frosts
e. Fires

17. Two species of finches are able to utilize the same food supply, but their beaks are different. They are able to coexist on an island because of

a. Niche overlap
b. Character displacement
c. Resource partitioning
d. Competitive exclusion
e. Realized niches

18. Which of the following of Lamarck’s evolutionary ideas turned out to be true?

a. Natural selection
b. Organisms naturally transform into increasingly complex organisms
c. Inheritance of acquired characters
d. Body parts develop with increased usage and weaken with disuse
e. Genes are the basic units of inheritance

19. Which of the following is a trait that results from disruptive selection?

a. Insecticide resistance
b. Male peacocks have colorful plumage while females do not
c. Within the same species, some birds have large bills, while others have small bills.
d. Human height
e. Various varieties of wheat

20. Which of the following would create the greatest amount of genetic variation for a diploid species in a single generation?

a. Crossing over
b. Mutation
c. Hybridization
d. Independent assortment of homologs
e. Random joining of gametes

DAT Biology (Natural Sciences) Practice Questions Answers