Test your biology understanding with interactive quizzes covering key concepts from cells to ecosystems. Perfect for quick review before class, homework checks, or identifying weak areas that need more study time.
8 sample questions. Expand to see answers and explanations.
1. What is the basic unit of life?
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Answer
The cell
Explanation
All living organisms are made of one or more cells, making the cell the fundamental unit of life.
Type: multiple choice
2. Which organelle is responsible for photosynthesis in plant cells?
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Answer
Chloroplast
Explanation
Chloroplasts contain chlorophyll and are the sites of photosynthesis in plant cells.
Type: multiple choice
3. True or False: DNA is double-stranded while RNA is typically single-stranded.
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Answer
True
Explanation
DNA forms a double helix structure with two complementary strands. RNA is usually single-stranded (except in some viruses).
Type: true false
4. What process do cells use to divide into two identical daughter cells?
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Answer
Mitosis
Explanation
Mitosis is cell division that produces two genetically identical diploid cells. Meiosis produces four non-identical haploid cells (gametes).
Type: multiple choice
5. Which blood type is considered the universal donor?
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Answer
O negative
Explanation
O negative blood lacks A, B, and Rh antigens, so it can be given to recipients of any blood type without causing an immune reaction.
Type: multiple choice
6. What is the role of ribosomes in the cell?
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Answer
Protein synthesis
Explanation
Ribosomes read mRNA and assemble amino acids into proteins during translation.
Type: multiple choice
7. True or False: Natural selection acts on phenotypes, not genotypes.
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Answer
True
Explanation
Natural selection favors or disfavors observable traits (phenotypes). The underlying genes (genotypes) are passed on based on phenotypic success.
Type: true false
8. Which molecule stores genetic information in most organisms?
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Answer
DNA (deoxyribonucleic acid)
Explanation
DNA stores hereditary information in sequences of nucleotide bases (A, T, G, C). RNA stores genetic information in some viruses.
Type: multiple choice
Workflow
Take a biology quiz as a quick self-assessment before studying
Note which questions you miss and review those topics in your notes
Retake the quiz after review to track improvement
Tips
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