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 87 of 124
- A. Insertion
- B. Point mutation
- C. Deletion
- D. Transposition
Explanation: Explanation for this question will be added soon!
Correct answer: Transposition- A. Deletion
- B. Point mutation
- C. Insertion
- D. Aberration
Explanation: The change in the number of chromosomes, either an increase or a decrease from the normal diploid number, is referred to as chromosomal…
Correct answer: Aberration- A. Chemicals
- B. Radiations
- C. Water
- D. None of the above
Explanation: Water is not considered a mutagen. Mutagens are agents that can induce mutations in DNA, potentially leading to changes in the genetic…
Correct answer: Water1724. Sickle anemia is a:
- A. Insertion
- B. Point mutation
- C. Deletion
- D. Transposition
Explanation: Sickle cell anemia is indeed caused by a point mutation in the gene that codes for the beta-globin subunit of hemoglobin.
Correct answer: Point mutation- A. Sickle cell anemia
- B. Diabetes
- C. Phenylketonuria
- D. None of the above
Explanation: Phenylketonuria is a genetic disorder caused by a mutation in the gene responsible for producing the enzyme phenylalanine hydroxylase…
Correct answer: Phenylketonuria- A. Genes are present on DNA
- B. Genes are present on chromatids
- C. Genes are present on chromosomes
- D. All of the above
Explanation: The chromosomal theory of inheritance suggests that genes, the units of heredity, are located on chromosomes.
Correct answer: All of the above- A. There are more chromosomes but less gene
- B. There are more gene but less chromosomes
- C. Each chromosome carry only one gene
- D. None of the above
Explanation: The objection was: If Mendelian characters are determined by genes located on the chromosomes, and if the independent assortment of…
Correct answer: There are more gene but less chromosomes- A. All the male were red eyed
- B. All the female were white eyed
- C. Neither of female white eyed
- D. All of the above
Explanation: The strange result observed by T.H. Morgan during his experiments with fruit flies (Drosophila melanogaster) was the absence of any female…
Correct answer: Neither of female white eyed- A. Transforming activity continues after destruction of protein
- B. Transforming activity continues after destruction of lipids
- C. Transforming activity continues after destruction of DNA
- D. Transforming activity continues after destruction of carbohydrates
Explanation: In the experiments conducted by Avery, MacLeod, and McCarty in 1944, they demonstrated that when DNA was destroyed using enzymes that…
Correct answer: Transforming activity continues after destruction of DNA- A. DNA is double helix
- B. Base paring is purine and pyrimidine
- C. DNA is composed of parallel strands
- D. Base pair are plainer
Explanation: Explanation for this question will be added soon!
Correct answer: DNA is composed of parallel strands- A. Both strands are synthesized
- B. None of the strands is synthesized
- C. Only one strand is synthesized
- D. None of the above
Explanation: Explanation for this question will be added soon!
Correct answer: Only one strand is synthesized- A. Both strands contain N14
- B. Both strands contain N15
- C. One strand is N14 and other N15
- D. All of the above
Explanation: This is the correct option. Meselson and Stahl found that after one round of DNA replication in a medium containing only N14, the DNA…
Correct answer: Both strands contain N15- A. Lagging strand does not allow continuous replication
- B. Lagging strand is 3 to 5 direction
- C. Lagging strand is 5 to 3 direction
- D. Lagging strand is placed near to leading strand
Explanation: The main reason for Okazaki fragments forming on the lagging strand is the antiparallel nature of DNA strands and the requirement for DNA…
Correct answer: Lagging strand is 3 to 5 direction- A. Synthesis of DNA
- B. Synthesis of mRNA
- C. Synthesis of protein
- D. All of the above
Explanation: This process involves the creation of new DNA strands through DNA replication.
Correct answer: All of the above- A. It has opposite codes of template strand
- B. It has similar codes as of template strand
- C. Its codes are similar to mRNA codes
- D. Its codes are opposite to mRNA codes
Explanation: The coding (sense) strand has a sequence that matches the sequence of the mRNA transcript, except that it contains thymine (T) instead of…
Correct answer: Its codes are similar to mRNA codes- A. Chromosomes
- B. Cell membrane
- C. Nucleus
- D. Nuclear membrane
Explanation: Chromosomes are thread-like structures made of DNA and proteins. They condense and become visible during cell division to ensure that each…
Correct answer: Chromosomes- A. 2
- B. 6
- C. 4
- D. 3
Explanation: The chromosomes are called telocentric, acrocentric, sub-metacentric and metacentric depending upon the location of centromere between the…
Correct answer: 4- A. Covalent
- B. Hydrogen
- C. Ionic
- D. Phosphodiester
Explanation: Hydrogen bonds are formed between the nitrogenous bases of DNA. Specifically, adenine (A) forms two hydrogen bonds with thymine (T), and…
Correct answer: Hydrogen- A. 5' - 3'
- B. 3' - 5'
- C. Both
- D. None
Explanation: DNA replication proceeds in a directional manner, with new DNA strands synthesized in the 5' to 3' direction.
Correct answer: 5' - 3'- A. Ligase
- B. Polymerase III
- C. Polymerase II
- D. DNAase
Explanation: Ligase is responsible for sealing the nicks between adjacent Okazaki fragments by catalyzing the formation of phosphodiester bonds.
Correct answer: Ligase