Free Cell Structure and Function MCQs with Answers
2,478 Cell Structure and Function MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Animal, plant, prokaryotic and eukaryotic cells are compared through their membranes, cell walls, nuclei and cytoplasmic organelles. The work includes the structures and functions of mitochondria, chloroplasts, ribosomes, endoplasmic reticulum, Golgi apparatus and lysosomes, as well as chromosome organization and the distinction between chromatin and chromosomes.
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Read the Cell Structure and Function notesFree MDCAT chapter notes with key terms2,478 questions · page 86 of 124
- A. Two nucleotides
- B. Three nucleotides
- C. Four nucleotides
- D. All of the above
Explanation: The genetic code is a combination of nucleotide triplets called codons, which are sequences of three adjacent nucleotides along the mRNA…
Correct answer: Three nucleotides- A. 43
- B. 60
- C. 64
- D. 68
Explanation: The total number of possible genetic codes is 64. This is because there are 4 different nucleotides (A, C, G, and U) that can be arranged…
Correct answer: 64- A. AUU
- B. AUG
- C. UGA
- D. UCC
Explanation: The initiation codon, which also serves as the start codon for protein synthesis, is AUG.
Correct answer: AUG- A. UAA
- B. UAG
- C. UCC
- D. UGA
Explanation: The codon UCC, which codes for the amino acid serine, is not a termination or nonsense codon.
Correct answer: UCC- A. Crick
- B. Watson
- C. Nirenberg
- D. Philip Leader
Explanation: Explanation for this question will be added soon!
Correct answer: Watson1706. The code of arginine is:
- A. CAU
- B. CCU
- C. CGU
- D. CAA
Explanation: The genetic code for arginine is represented by the codons CGU, CGC, CGA, CGG, AGA, and AGG.
Correct answer: CGU- A. GUU
- B. GUA
- C. GUC
- D. GCU
Explanation: The genetic code for the amino acid alanine is represented by the codons GCU, GCC, GCA, and GCG.
Correct answer: GCU- A. CCC
- B. UUU
- C. AAA
- D. GGG
Explanation: The genetic code for the amino acid phenylalanine is represented by the codons UUU and UUC.
Correct answer: UUU- A. UUU
- B. GCU
- C. GCA
- D. GGC
Explanation: The genetic code for the amino acid glycine is represented by the codons GGU, GGC, GGA, and GGG.
Correct answer: GGC- A. A site
- B. P site
- C. E site
- D. None of the above
Explanation: Proteins called initiation factor position the tRNA on the ribosomal surface at the P site (peptidyl site) where peptide bonds will form.
Correct answer: P site- A. A site
- B. P site
- C. E site
- D. None of the above
Explanation: Explanation for this question will be added soon!
Correct answer: E site- A. Glycine
- B. Methionine
- C. Alanine
- D. Phenylalanine
Explanation: Explanation for this question will be added soon!
Correct answer: Methionine- A. tRNA synthase
- B. Initiation factor
- C. Elongation factor
- D. Termination factor
Explanation: The binding of tRNA to the ribosomal unit during translation is primarily controlled by a group of proteins known as initiation factors.
Correct answer: Initiation factor- A. tRNA synthase
- B. Initiation factor
- C. Elongation factor
- D. Termination factor
Explanation: Explanation for this question will be added soon!
Correct answer: Elongation factor- A. Termination factor
- B. Elongation factor
- C. Initiation factor
- D. tRNA synthase
Explanation: The movement of the ribosome to the next codon on the mRNA during translation is primarily controlled by elongation factors.
Correct answer: Elongation factor- A. 3'
- B. 4'
- C. 5'
- D. 6'
Explanation: During translation, the ribosome moves along the mRNA molecule in the 5' to 3' direction.
Correct answer: 3'- A. Termination factor
- B. Elongation factor
- C. Initiation factor
- D. Releasing factor
Explanation: The termination codons, also known as stop codons, are recognized by proteins called release factors.
Correct answer: Releasing factor- A. 50 billion km
- B. 100 billion km
- C. 200 billion km
- D. 300 billion km
Explanation: If the DNA of a human adult were lined up end to end, it would stretch nearly 100 billion kilometers, reaching a distance roughly…
Correct answer: 100 billion km- A. Insertion
- B. Point mutation
- C. Deletion
- D. Transposition
Explanation: A point mutation refers to the substitution, insertion, or deletion of a single nucleotide base (or a few bases) in a DNA sequence.
Correct answer: Point mutation- A. Insertion
- B. Point mutation
- C. Deletion
- D. Transposition
Explanation: The addition of one or a few bases into a DNA sequence is called an insertion mutation.
Correct answer: Insertion