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Biology — Intermediate

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IntermediateScience
Today's questions

Today's quiz questions

These are the questions that make up today's quiz. Test your knowledge, see how much you know, and learn from the explanation behind every answer.

  1. 1.What is the basic unit of life?

    • •The molecule
    • •The tissue
    • •The cell
    • •The atom

  2. 2.What is the endocrine system?

    • •The organs involved in filtering blood and producing urine
    • •A network of glands that produce hormones
    • •The collection of muscles and tendons that allow body movement
    • •The system of nerves that controls voluntary muscle movements

  3. 3.What is the symbiotic relationship between clownfish and sea anemones?

    • •Parasitism: the clownfish feeds on the anemone's tissue
    • •Mutualism: the clownfish gets protection from the anemone's stinging tentacles, while the anemone benefits from the clownfish's waste nutrients and protection from predators
    • •Commensalism: the clownfish benefits while the anemone is unaffected
    • •Competition: both species compete for the same food resources

  4. 4.What are stem cells?

    • •Cells found only in the stems of plants
    • •Blood cells that fight infections
    • •Dead cells that form the outer layer of skin
    • •Undifferentiated cells capable of dividing and developing into specialized cell types

  5. 5.Which molecule carries genetic information?

    • •DNA (deoxyribonucleic acid)
    • •RNA (ribonucleic acid)
    • •Proteins
    • •ATP

  6. 6.Which scientist proposed the theory of evolution by natural selection?

    • •Louis Pasteur
    • •Jean-Baptiste Lamarck
    • •Gregor Mendel
    • •Charles Darwin

  7. 7.How many pairs of chromosomes does a normal human cell have?

    • •23 pairs (46 chromosomes)
    • •24 pairs (48 chromosomes)
    • •20 pairs (40 chromosomes)
    • •22 pairs (44 chromosomes)

  8. 8.What is the function of the Golgi apparatus?

    • •To break down old organelles and waste materials
    • •To produce ATP through cellular respiration
    • •To modify, sort, and package proteins and lipids
    • •To store genetic information in the cell

  9. 9.What is the structure of DNA?

    • •A triple helix of sugar-phosphate backbones
    • •Two parallel protein chains held together by hydrogen bonds
    • •A single strand of nucleotides forming a circular molecule
    • •A double helix of two antiparallel strands connected by complementary base pairs (A-T, G-C)

  10. 10.What is the difference between prokaryotic and eukaryotic cells?

    • •Prokaryotes are multicellular; eukaryotes are unicellular
    • •Prokaryotes are larger than eukaryotes
    • •Prokaryotes lack a nucleus and membrane-bound organelles; eukaryotes have them
    • •Prokaryotes have mitochondria; eukaryotes do not