GRE Biology Practice Test 1

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Online GRE Biology Practice Test 1 for different Competitive Exams, Entrance Tests & Job Interviews. Test yourself. Take various online tests and find out how well you score before appearing in your upcoming interviews and written tests.

Instructions

Welcome to our FREE online test. Beware of anyone asking for money to take this test.

Total questions: 20

Time limit: 30 minutes

Each question is worth 1 point, and there are no penalties for wrong answers.

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Time remaining: 30:00
1. Which of the following is NOT a function of the Golgi apparatus?
  1. Protein modification and sorting
  2. Formation of lysosomes
  3. ATP synthesis
  4. Packaging of secretory vesicles
2. Match the following enzymes with their respective functions:
  1. DNA polymerase – Synthesises new DNA strands
  2. RNA polymerase – Breaks down lipids
  3. Lipase – Replicates mitochondria
  4. ATP synthase – Degrades proteins
3. A researcher observes that a plant species growing in shaded areas has broader leaves compared to the same species in sunny areas. What is the most likely explanation?
  1. Genetic mutation due to sunlight exposure
  2. Phenotypic plasticity to maximise light absorption
  3. Disease affecting only shaded plants
  4. Lack of nutrients in shaded regions
4. Arrange the following steps of mitosis in the correct order:
  1. Anaphase → Metaphase → Prophase → Telophase
  2. Prophase → Metaphase → Anaphase → Telophase
  3. Telophase → Anaphase → Prophase → Metaphase
  4. Metaphase → Prophase → Telophase → Anaphase
5. Assertion (A): Antibiotic resistance in bacteria is an example of natural selection.
Reason (R): Bacteria with resistance genes survive and reproduce better in the presence of antibiotics.
  1. Both A and R are true, and R explains A
  2. Both A and R are true, but R does not explain A
  3. A is true, but R is false
  4. A is false, but R is true
6. Fill in the blank: The process by which mRNA is decoded to produce a specific polypeptide chain is called __________.
  1. Replication
  2. Translation
  3. Transcription
  4. Translocation
7. Which of the following ecological interactions is an example of mutualism?
  1. A lion hunting a deer
  2. A tapeworm living in a human intestine
  3. Bees pollinating flowers while collecting nectar
  4. A fungus decomposing dead wood
8. A scientist observes that a population of moths in a forest has two colour variants—light and dark. Over time, the dark variant becomes more common due to industrial pollution darkening tree bark. This is an example of:
  1. Genetic drift
  2. Directional selection
  3. Stabilizing selection
  4. Artificial selection
9. Arrange the following taxonomic categories in order from most inclusive to least inclusive:
  1. Species → Genus → Family → Order
  2. Kingdom → Phylum → Class → Order
  3. Family → Genus → Species → Class
  4. Order → Family → Genus → Phylum
10. Assertion (A): C4 plants are more efficient in photosynthesis under high temperatures and light intensity compared to C3 plants.
Reason (R): C4 plants have a specialized Kranz anatomy that minimizes photorespiration.
  1. Both A and R are true, and R explains A
  2. Both A and R are true, but R does not explain A
  3. A is true, but R is false
  4. A is false, but R is true
11. In the human digestive system, bile is produced by which organ?
  1. Pancreas
  2. Liver
  3. Stomach
  4. Gallbladder
12. Which of these cell organelles contains its own DNA?
  1. Endoplasmic reticulum
  2. Golgi apparatus
  3. Mitochondrion
  4. Lysosome
13. A population of butterflies shows 36% homozygous dominant (AA), 48% heterozygous (Aa), and 16% homozygous recessive (aa) individuals. Is this population in Hardy-Weinberg equilibrium?
  1. Yes, because the observed frequencies match expected frequencies
  2. No, because there are too many heterozygotes
  3. No, because the recessive allele is too common
  4. Cannot be determined without migration rates
14. Arrange the following steps of the scientific method in correct order:
  1. Analyze data → Form hypothesis → Conduct experiment → Make observation
  2. Make observation → Form hypothesis → Conduct experiment → Analyze data
  3. Form hypothesis → Make observation → Analyze data → Conduct experiment
  4. Conduct experiment → Analyze data → Make observation → Form hypothesis
15. Assertion (A): The resting membrane potential of neurons is negative.
Reason (R): There are more sodium ions inside the cell than outside at rest.
  1. Both A and R are true, and R explains A
  2. Both A and R are true, but R does not explain A
  3. A is true, but R is false
  4. A is false, but R is true
16. Which biome is characterized by permafrost, low-growing vegetation, and extremely cold temperatures?
  1. Tropical rainforest
  2. Temperate grassland
  3. Tundra
  4. Deciduous forest
17. Fill in the blank: The __________ is the basic functional unit of the kidney where blood filtration occurs.
  1. Alveolus
  2. Nephron
  3. Neuron
  4. Hepatocyte
18. In a food chain with the sequence: Grass → Grasshopper → Frog → Snake → Hawk, which organism is the tertiary consumer?
  1. Grasshopper
  2. Frog
  3. Snake
  4. Hawk
19. Which of the following is NOT a characteristic of prokaryotic cells?
  1. Lack of membrane-bound organelles
  2. Presence of circular DNA
  3. Presence of nuclear membrane
  4. Smaller ribosomes (70S)
20. A researcher crosses two heterozygous pea plants (Tt × Tt) for tall stem. What percentage of offspring will show the recessive phenotype?
  1. 0%
  2. 25%
  3. 50%
  4. 75%

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