Questions about dna and rna

Questions about dna and rna DEFAULT
1. ________________ are organic molecules that have the function of starting and regulating chemical reactions.      a) carbohydrates b) lipids c) enzymes d) endoplasmic reticula  2. Amino acids are the building blocks of:a)DNA and RNA b)lipids c)proteins d)carbohydrates 3. There are ________ different kinds of amino acids.a)20 b)46 c)100 d)20,000-25,000 4. The largest molecules in our bodies are:a)nucleic acids b)chromosomes c)proteins d)amino acids 5. Which of the following statements is true?a)Each DNA molecule is a single gene. b)DNA molecules are in the shape of a double helix. c)mRNA molecules are in the shape of a double helix. 6. The human body is composed mostly of:      a)calcium, iron, phosphorus, and zinc b)oxygen, hydrogen, calcium, and iron c)oxygen, nitrogen, hydrogen, and carbon 7. Which of the following statements is true about DNA?a)At the beginning of protein synthesis, a section of a DNA molecule unwinds and unzips. b)All of our DNA is normally located in the nucleus of our cells. c)DNA is composed of amino acids, phosphates, sugars, and bases. 8. Which of the following statements is true about the protein synthesis process?      a)When a section of a DNA molecule unwinds and unzips along its bases, a transfer RNA forms by copying one side of the DNA. b)The transfer RNA leaves the nucleus and goes out to the ribosomes in the cytoplasm where proteins are assembled with the help of messenger RNA. c)Both statements are false 9. Which of the following occurs at the ribosomes?      a)Most of a cell's DNA molecules are stored there. b)Proteins are produced there. c)mRNA are produced there. 10. Each tRNA anticodon has three bases. The three base combinations are codes for attracting specific kinds of:      a)endoplasmic reticula b)ribosomes c)amino acids. 11. Which of the following statements is true about DNA replication?      a)One DNA molecule becomes two identical ones as a result of this process. b)It occurs during meiosis but not mitosis. c)It is part of the protein synthesis process. 12. A DNA codon consists of:      a)one nucleotide b)three nucleotides c)hundreds or even thousands of nucleotides 13. A gene is essentially a:a)sequence of many codons in a DNA molecule b)single codon in a DNA molecule c)chromosome 14. There are about 3 billion chemical base pairs in human DNA. Approximately what percent of these base pairs actually code for genes? a)100% b)30-50% c)1-2% 15. Portions of DNA molecules that do not contain the codes for proteins are called:a)introns b)exons c)mutagens 16. Which of the following statements is true regarding the DNA code?a)Each of the 64 types of codons in DNA and RNA code for a different amino acid. b)Not all codons specify amino acid components to be included in a protein. c)DNA replication has a built-in mechanism that prevents or corrects all errors. 17. The DNA code is:a)unique to humans b)found only in mammals c)shared by all living things

DNA Structure Questions for Students
DNA Structure:
Teachers: see the Lesson Plan.

You are not expected to know all the answers. Use the buttons in the DNA tutorial to investigate. Play around with the DNA molecule to try to figure out the answer to a question! If you find the questions too hard, you may find it useful to visit Andrew Carter's introductory story about DNA Structure.

    Question Set A (for ages 14 and older)

  1. What is a "strand" of DNA?
  2. How many strands make up a DNA double helix?
  3. Each strand is made up of two zones or regions. One zone of each strand is made up of identical repeating units, while another zone is made up of differing units. What are these zones of each strand called?
  4. What holds one strand against the other in the double helix?
  5. How do cells make accurate copies of DNA?
  6. When do cells duplicate their DNA?
  7. What information is coded into DNA?
  8. What is a "codon"?
  9. What is "transcription" of DNA?
  10. What is "translation" of DNA?
    Question Set B (for ages 18 and older)
  11. What are the four pairs of DNA bases that form in the double helix?
  12. How can A distinguish T from C?
  13. Which DNA double helix do you think would be harder to separate into two strands: DNA composed predominantly of AT base pairs, or of GC base pairs? Why?
  14. What is a mutation?
  15. The DNA double helix looks like a twisted ladder. What makes up each rung of the ladder? What holds the rungs together at the sides?
  16. Is there mostly empty space between the atoms in a DNA double helix?
  17. One base pair is not in position to form normal Watson-Crick hydrogen bonds. Can you find it? (Note: Clicking on any base in D. Ends, Antiparallelism reports its letter and sequence number at the bottom of the browser window in the status line, following the word "Group". Use this feature to obtain the letters and sequence numbers of the abnormal base pair, once you find it.)
  18. How do proteins recognize specific sequences of DNA? (More about this.)
    Question Set C (for ages 20 and older)
  19. Which bases are purines? Pyrimidines?
  20. If a purine were substituted for a pyrimidine at a single position in one strand of a DNA double helix, what would happen?
  21. In a DNA double helix, why doesn't an A or T form two hydrogen bonds (out of the three possible) with G or C?
  22. How many kinds of 5-membered rings are in DNA?
  23. How many kinds of 6-membered rings are in DNA?
  24. Does the "free arm" of deoxyribose (the carbon that is not a member of the pentose ring) point in the direction in which the coding strand is read, or against it?
  25. Based on the codons shown (in the Codons movie in section B. The Code), is the DNA strand shown the template strand or the coding strand?

Answers are available to teaching faculty who inquire with an email to [email protected] providing evidence of their faculty positions, such as by reference to a school or college website listing faculty. I will not send answers unless you tell me your full name, position (student, teacher, etc.), institution, city/state, country. If you are not a teacher, please tell me the name and email of your teacher, and your teachers website if there is one.

Questions by Frieda Reichsman (MoleculesInMotion.Com) and Eric Martz. Feedback to Eric Martz.
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30 QuestionsShow answers
  • Q. Replicate the following strand of DNA: 
  • Q. Where does DNA replication take place?
  • Q. Before the cell divides, what process needs to happen?
  • Q. Where does transcription take place?
  • Q. The process of making mRNA from DNA is called.
  • Q. A triplet of mRNA is called a
  • Q. The anticodon is located on 
  • Q. The codon is located on the 
  • Q. Which molecule brings the amino acid to the ribosome?
  • Q. Where does translation take place?
  • Q. Protein synthesis takes place in two parts:
    Transcription then translation
    Replication then transcription
    Translation then transcription
    Replication then translation
  • Q. In DNA which is a correct base pairing?
  • Q. RNA is different from DNA because ______
  • Q. What of the following shows the correct sequence for the production of a protein?
    DNA -> Protein -> RNA
    Protein -> RNA -> DNA
    RNA -> DNA -> Protein
    DNA -> RNA -> Protein
  • Q. An enzyme that adds complementary nucleotides to the template strand of the unzipped double helix
  • Q. The building blocks of DNA  & RNA consisting of a five-carbon sugar, a phosphate group, and a nitrogen-containing base.
  • Q. During transcription, this is the enzyme that binds to a specific section where an mRNA will be synthesized.
  • Q. The five carbon sugar found in DNA
  • Q. The five carbon sugar found in RNA
  • Q. During replication, the enzyme that breaks the hydrogen bonds holding the base pairs together as it UNWINDS and UNZIPS the double helix 
  • Q. In messenger RNA, each codon specifies a particular...
  • Q. During which stage of the cell cycle does chromosome replication occur?
  • Q. The number of nitrogen bases in a codon is ....
  • Q. The process of making proteins on the ribosome based on instructions from messengerRNA is called...
  • Q. A change in the DNA code of an organism is called a ....
  • Q. A single-base mutation in a DNA sequence that is GTC ATA would be...
  • Q. The bonds that hold the two strands of DNA together come from...
    the attraction of phosphate groups 
    strong bonds between  bases and sugars
    carbon to carbon bonds in the sugar
    weak hydrogen bonds between the bases
  • Q. Which type of RNA brings the information in the genetic code form the nucleus to other parts of the cell?
  • Q. A mutation that involves adding a nucleotide is called
  • Q. What is the relationship between a protein, a cell and DNA?
    DNA is produced by protein which is produced in cell
    Proteins are composed of DNA which is produced in cell
    DNA controls the production of proteins in a cell
    A cell is composed only of DNA and protein
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DNA \u0026 RNA Top Question - Biology gk Question - RRB JE, SSC

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Dna rna and about questions

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