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 28 of 32
- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Parent cell has 48 chromosomes and number of chromosomes don't change in mitosis. So daughter cell will also have 48 chromosomes.
Correct answer: Option B- A. Individual
- B. Population
- C. Community
- D. Biosphere
Explanation: A genome is a full set of genes of an individual.
Correct answer: Individual- A. Down's syndrome
- B. Klinefelter syndrome
- C. Turner's syndrome
- D. Duchenne muscular dystrophy
Explanation: Turner's syndrome involves short stature, infertility, webbed neck, low hairline at the back of the neck (pterygium colli), and may…
Correct answer: Turner's syndrome544. A female having 44+XO chromosome, webbed neck and large number of moles is syndrome suffering from
- A. Turner's syndrome
- B. Down's syndrome
- C. Klinefelter syndrome
- D. Sickle cell anaemia
Explanation: This description accurately fits Turner syndrome, as indicated by the karyotype 44+XO, which signifies the absence of one X chromosome.
Correct answer: Turner's syndrome- A. 6
- B. 8
- C. 21
- D. 7
Explanation: d) 7: This option is correct. The gene for the blue opsin is located on chromosome 7 in humans.
Correct answer: 7- A. 16
- B. 8
- C. 32
- D. 24
Explanation: Spermatogonium (2n) divides by mitosis and we get primary spermatocyte (2n) and by meiosis from one primary spermatocyte (2n), we get two…
Correct answer: 16- A. Chromatin
- B. Lipid
- C. Metal ions
- D. Thylakoids
Explanation: This option is correct. Chromatin is composed of DNA and proteins, and it is present in the nucleus.
Correct answer: Chromatin- A. It produces amino acids
- B. It produces messenger RNA
- C. It results in increased DNA synthesis
- D. It is a semi conservative process
Explanation: Transcription of DNA means the formation of mRNA out of DNA. Translation is the synthesis of proteins using these mRNAs.
Correct answer: It produces messenger RNA549. DNA replication is:
- A. Continuous and conservative
- B. Discontinuous and semiconservative
- C. Semidiscontinuous and semiconservative
- D. Conservative and semidiscontinuous
Explanation: Replication is semiconservative because the new daughter DNA synthesized is composed of one parent DNA and one newly synthesized…
Correct answer: Semidiscontinuous and semiconservative- A. mRNA
- B. rRNA
- C. tRNA
- D. Polysome
Explanation: Option A is messenger RNA, the transcript of a segment of DNA that serves as the code which is then translated by the ribosomes.Option B…
Correct answer: rRNA- A. Deoxyribose sugar
- B. Ribose sugar
- C. Phosphate group
- D. Sequence of nitrogenous bases
Explanation: The genetic information of DNA is encoded as the sequence of nitrogenous bases.
Correct answer: Sequence of nitrogenous bases- A. TACGGATCCTG
- B. UAGCGAUCCUG
- C. AUGCCUAGGAC
- D. UACCGAUCCUG
Explanation: DNA strand serves as the template for RNA synthesis. The RNA nucleotide sequence is complementary to that of DNA template strand except…
Correct answer: UACCGAUCCUG- A. 5th
- B. 4th
- C. 3rd
- D. 1st
Explanation: A nucleotide consists of a sugar molecule (either ribose in RNA or deoxyribose in DNA) attached to a phosphate group and a…
Correct answer: 1st- A. Heterochromatin
- B. Nucleosome
- C. Super coils
- D. None of these
Explanation: Heterochromatin represents the highly condensed portions of chromatin. This dense packing makes the DNA inaccessible to the transcription…
Correct answer: Heterochromatin- A. 44 + XY
- B. 44 + XXY
- C. 44 + XO
- D. 44 + XXX
Explanation: The genotype of a normal male contains 44 autosomes and two sex chromosomes, which are XY.
Correct answer: 44 + XY- A. Only one daughter cell will have heavy DNA
- B. Two daughter cells have normal DNA and the other two have heavy DNA
- C. All daughter cells have heavy DNA
- D. All daughter cells contain hybrid DNA
Explanation: Duplication of DNA is by the semi-conservative method that was first shown in escherichia coli and later it was observed in higher…
Correct answer: Two daughter cells have normal DNA and the other two have heavy DNA- A. Down's Syndrome
- B. Turner's Syndrome
- C. Klinefelter's Syndrome
- D. Sickle Cell Anemia
Explanation: Klinefelter syndrome is a genetic condition in which a boy is born with an extra X chromosome.
Correct answer: Klinefelter's Syndrome- A. 10
- B. 30
- C. 40
- D. 44
Explanation: Haploid cells are formed by reduction division, which has half the number of chromosomes than diploid cells.
Correct answer: 44- A. 1
- B. 2
- C. 3
- D. 4
Explanation: The zygote, formed by the fusion of a sperm and an ovum, is the first cell to contain the diploid number of chromosomes.
Correct answer: 3- A. Complementary strand of mRNA which codes for one amino acid
- B. tRNA molecule where the amino acid is attached
- C. tRNA molecule which recognizes the appropriate sequence of bases on the mRNA
- D. mRNA molecule which instructs the ribosomes to initiate
Explanation: The correct answer is Option D. An anticodon is a sequence of three nucleotides on a tRNA molecule that recognizes and pairs with a…
Correct answer: tRNA molecule which recognizes the appropriate sequence of bases on the mRNA