Free Chromosomes MCQs with Answers
633 Chromosomes MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Chromosomes are DNA-protein structures that carry genes and become visible during cell division. Coverage includes chromatin, centromeres, sister chromatids, homologous chromosomes, chromosome number, and the distinction between diploid and haploid cells, with links to DNA replication, mitosis and meiosis.
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633 questions · page 7 of 32
- A. mRNA
- B. rRNA
- C. tRNA
- D. None of the above
Explanation: In the context of molecular biology and genetics, "codes" typically refer to codons.
Correct answer: mRNA- A. Leading strand
- B. Antisense strand
- C. Sense strand
- D. Lagging strand
Explanation: During transcription, the strand of DNA that serves as the template for RNA synthesis is called the antisense strand or the noncoding…
Correct answer: Antisense strand123. Coding strand is:
- A. Leading strand
- B. Antisense strand
- C. Sense strand
- D. Lagging strand
Explanation: The coding strand, also known as the sense strand or non-template strand, is the strand of DNA that has the same sequence as the RNA…
Correct answer: Sense strand- A. RNA Polymerase I
- B. RNA Polymerase II
- C. RNA Polymerase III
- D. None of the above
Explanation: mRNA (messenger RNA) is synthesized by RNA polymerase II in eukaryotic cells.
Correct answer: RNA Polymerase II- A. RNA Polymerase I
- B. RNA Polymerase II
- C. RNA Polymerase III
- D. None of the above
Explanation: tRNA (transfer RNA) is synthesized by RNA polymerase III in eukaryotic cells.
Correct answer: RNA Polymerase III- A. Operator
- B. Promoter
- C. Enhancer
- D. None of the above
Explanation: Transcription typically starts at a specific DNA sequence called the promoter region.
Correct answer: Promoter127. The binding site is:
- A. TTGGC
- B. TTGACA
- C. TTGCAA
- D. TTGAAC
Explanation: The binding site "TTGACA" corresponds to the consensus sequence of the -35 region of the promoter in bacterial DNA.
Correct answer: TTGACA- A. Alpha factor
- B. Sigma factor
- C. Beta factor
- D. Gama factor
Explanation: In bacterial RNA polymerase, the sigma (σ) factor is indeed an essential subunit.
Correct answer: Sigma factor- A. CA
- B. GA
- C. GC
- D. TA
Explanation: The stop sequences at the end of the gene terminate the synthesis of mRNA.
Correct answer: GC130. Cap in mRNA is:
- A. Poly A
- B. Poly C
- C. Methyl GTP
- D. Methyl ATP
Explanation: Explanation for this question will be added soon!
Correct answer: Methyl GTP131. Tail of mRNA is:
- A. Poly A
- B. Poly C
- C. Methyl GTP
- D. Methyl ATP
Explanation: The tail of mRNA is called the poly(A) tail. It consists of a string of adenine nucleotides added to the 3' end of the mRNA molecule after…
Correct answer: Poly A- 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: Watson- 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