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Question 1: What is the primary function of DNA in living organisms?
- To produce oxygen
- To provide energy for cells
- To store genetic instructions
- To digest food particles
Answer: C. To store genetic instructions
Explanation: DNA acts as an instruction manual for cellular operation, containing the genetic code necessary for the development and function of all living organisms.
Question 2: Which molecule is synthesized during the process of transcription?
- Chromosome
- Protein
- Messenger RNA
- Amino acid
Answer: C. Messenger RNA
Explanation: Transcription is the first step of gene expression where DNA is copied into messenger RNA, or mRNA, using complementary base pairing rules.
Question 3: What is the term for a specific segment of DNA that codes for a protein?
- Gene
- Nucleus
- Chromosome
- Allele
Answer: A. Gene
Explanation: A gene is a specific segment of DNA that contains the instructions for making a functional product, which is usually a protein.
Question 4: In the DNA double helix, which base always pairs with adenine?
- Thymine
- Guanine
- Uracil
- Cytosine
Answer: A. Thymine
Explanation: DNA is composed of four bases: adenine (A), thymine (T), guanine (G), and cytosine (C). Adenine always pairs with thymine, and cytosine pairs with guanine.
Question 5: What is the process of assembling proteins from mRNA called?
- Replication
- Translation
- Mutation
- Transcription
Answer: B. Translation
Explanation: Translation is the process where ribosomes read the mRNA sequence to assemble the corresponding amino acid sequence into a functional protein.
Question 6: What are different versions of the same gene called?
- Alleles
- Chromosomes
- Proteins
- Codons
Answer: A. Alleles
Explanation: Alleles are different versions of the same gene, and individuals inherit one copy of each gene from each of their biological parents.
Question 7: What is a sequence of three nucleotide bases called?
- Codon
- Nucleus
- Chromosome
- Protein
Answer: A. Codon
Explanation: The genetic code is a triplet code where each amino acid is specified by a sequence of three nucleotide bases known as a codon.
Question 8: Where are genes located within human cells?
- In the cytoplasm
- On chromosomes
- In the cell membrane
- In the mitochondria
Answer: B. On chromosomes
Explanation: Genes are located on chromosomes, which are packed into the nucleus of most human cells to keep the genetic material organized.
Question 9: What term describes how environmental factors influence gene activity?
- Transcription
- Translation
- Replication
- Epigenetics
Answer: D. Epigenetics
Explanation: Epigenetics refers to how environmental factors, such as injury or sickness, can influence gene activity by turning specific genes on or off.
Question 10: Approximately how many pairs of chromosomes are in human cells?
- 46
- 23
- 12
- 3 billion
Answer: B. 23
Explanation: The human genome is contained within 23 pairs of chromosomes in human cells, totaling 46 chromosomes, and consists of about 3 billion base pairs.