DNA/RNA Review Quiz

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  • 1/20 Questions

    DNA takes on the shape of a double helix.

    • True
    • False
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About This Quiz

The entire group needs to participate in this interactive quiz to get each question correct. After answering each question, you will be shown the correct answer. To pass the quiz, you must get 8 out of the 10 correct. You will find out your total score at the end!

Molecular Biology Quizzes & Trivia

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  • 2. 

    What does DNA stand for?

    • Dyribose acid

    • Digestive nucleic acid

    • Dioxyribosenucleic acid

    Correct Answer
    A. Dioxyribosenucleic acid
    Explanation
    DNA stands for Dioxyribosenucleic acid. This is the correct answer because DNA is a molecule that contains the genetic instructions for the development and functioning of all known living organisms. It is composed of two strands of nucleotides, each containing a sugar molecule called deoxyribose, a phosphate group, and one of four nitrogenous bases (adenine, thymine, cytosine, or guanine). The presence of two deoxyribose molecules in DNA gives it the name Dioxyribosenucleic acid.

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  • 3. 

    RNA and DNA contain a nitrogenous base called uracil.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    correct answer: RNA does but DNA contains thymine

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  • 4. 

    RNA is a double stranded structure.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    correct answer: Single stranded- looks like 1/2 of a zipper

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  • 5. 

    For what reason is DNA replicated within a cell?

    • To add more traits to a living organism as it ages.

    • To fill increased space within the nucleus of a growing cell.

    • To change the traits of a living organism to meet its needs in a new environment.

    • To provide new cells with a complete and identical copy of genetic material.

    Correct Answer
    A. To provide new cells with a complete and identical copy of genetic material.
    Explanation
    DNA is replicated within a cell to provide new cells with a complete and identical copy of genetic material. This ensures that each new cell receives all the necessary genetic information to perform its functions and maintain the characteristics of the organism. Replication is essential for growth, development, and the replacement of damaged or old cells. It allows for the transmission of genetic traits from one generation to the next, ensuring the continuity of the species.

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  • 6. 

    If one side of the DNA molecule reads ATGCCGT, what would the complementary side read?

    • TACGCCU

    • UACGGCA

    • TACGGCA

    • TAGCCGA

    Correct Answer
    A. TACGGCA
    Explanation
    The DNA molecule consists of two strands that are complementary to each other. In DNA, adenine (A) pairs with thymine (T), and guanine (G) pairs with cytosine (C). Therefore, if one side of the DNA molecule reads ATGCCGT, the complementary side would read TACGGCA. This is because A pairs with T, T pairs with A, G pairs with C, and C pairs with G.

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  • 7. 

    Which of the following nucleotides bonds with cytosine?

    • Guanine only

    • Cytosine and guanine

    • Adenine only

    • Adenine and thymine

    Correct Answer
    A. Guanine only
    Explanation
    Guanine is the nucleotide that bonds with cytosine. This is because guanine and cytosine form a complementary base pair in DNA. The bonding between guanine and cytosine is known as a hydrogen bond, which helps to stabilize the DNA double helix structure. Adenine only bonds with thymine, forming another complementary base pair. Therefore, the correct answer is guanine only.

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  • 8. 

    What are the building blocks of DNA?

    • Genes

    • Nucleotides

    • Amino acids

    • Ribosomes

    Correct Answer
    A. Nucleotides
    Explanation
    Nucleotides are the building blocks of DNA. DNA is made up of a long chain of nucleotides, which are composed of a sugar molecule, a phosphate group, and a nitrogenous base. The sequence of these nucleotides forms the genetic code that determines the characteristics and functions of an organism. Genes, amino acids, and ribosomes are all important components in the process of protein synthesis, but they are not the basic units that make up DNA.

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  • 9. 

    What are the 3 parts of a nucleotide?

    • Fat, carbohydrate, a phosphate group

    • Simple sugar, a phosphate group, nitrogenous base

    • Lipid, a phosphate group, nitrogenous base

    • Carbohydrate, nitrogenous base, a phosphate group

    Correct Answer
    A. Simple sugar, a phosphate group, nitrogenous base
    Explanation
    A nucleotide is composed of three parts: a simple sugar, a phosphate group, and a nitrogenous base. The simple sugar provides the backbone of the nucleotide, the phosphate group is attached to the sugar, and the nitrogenous base is connected to the sugar as well. These three components together form the basic building blocks of nucleic acids, such as DNA and RNA.

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  • 10. 

    The closer the relationship between two organisms, the more similar their DNA nucleotide sequence will be.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The statement is true because DNA nucleotide sequences are used to determine the genetic relatedness between organisms. As organisms evolve and diverge from a common ancestor, their DNA sequences accumulate changes over time. Therefore, organisms that are closely related will have more similar DNA nucleotide sequences compared to those that are distantly related. This similarity in DNA sequences reflects the shared ancestry and evolutionary history between organisms.

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  • 11. 

    Transcription is the process of DNA acting as a template for creating a mRNA molecule. Where does this occur?

    • In the cell membrane

    • In the cytoplasm

    • In the nucleus

    • In the ribosomes

    Correct Answer
    A. In the nucleus
    Explanation
    Transcription occurs in the nucleus. This is where the DNA is located, and it acts as a template for creating mRNA molecules. The process of transcription involves the enzyme RNA polymerase binding to the DNA and synthesizing a complementary mRNA strand. The mRNA molecule then carries the genetic information from the nucleus to the ribosomes in the cytoplasm, where translation takes place to produce proteins.

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  • 12. 

    The sequence of mRNA is AGUACA. What is the sequence of tRNA?

    • UCAUGU

    • AGTACA

    • AGUACA

    • TCATGT

    Correct Answer
    A. UCAUGU
    Explanation
    The sequence of tRNA is UCAUGU because tRNA molecules have anticodons that are complementary to the codons on mRNA. In this case, the codon AGU on the mRNA corresponds to the anticodon UCA on the tRNA. The remaining codons and anticodons in the answer choices do not match the given mRNA sequence.

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  • 13. 

    What happens when DNA replicates?

    • One molecule forms with two original strands

    • Two molecules form with two new strands

    • Two molecules form with two original strands

    • Two molecules form with one original strand and one new strand

    Correct Answer
    A. Two molecules form with one original strand and one new strand
    Explanation
    When DNA replicates, two molecules are formed with one original strand and one new strand. This process is known as semi-conservative replication, where each new DNA molecule contains one strand from the original DNA molecule and one newly synthesized complementary strand. This ensures that the genetic information is accurately passed on to the daughter cells during cell division.

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  • 14. 

    What did the original DNA that produced an mRNA strand with a sequence of AGUACA look like?

    • UCAUGU

    • ACTACA

    • AGUACA

    • TCATGT

    Correct Answer
    A. TCATGT
    Explanation
    The original DNA that produced an mRNA strand with a sequence of AGUACA would have the complementary sequence TCATGT. In DNA, adenine (A) pairs with thymine (T) and guanine (G) pairs with cytosine (C). Therefore, the original DNA sequence would have T instead of A, C instead of G, G instead of C, T instead of A, G instead of C, and T instead of A.

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  • 15. 

    The nucleus contains all of the organism's DNA in long, tangled strings called organelles.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    correct answer: Chromatin

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  • 16. 

    In a chain of nucleotides, the sugar of one nucleotide would join to the:

    • Phosphate group of the next nucleotide

    • Sugar of the next nucleotide

    • Nitrogenous base of the next nucleotide

    • Next hydrogen bond

    Correct Answer
    A. Phosphate group of the next nucleotide
    Explanation
    In a chain of nucleotides, the sugar of one nucleotide joins to the phosphate group of the next nucleotide. This linkage forms the backbone of the DNA molecule, with the phosphate group connecting the sugars together. The nitrogenous base of each nucleotide is attached to the sugar molecule, and the hydrogen bonds form between the nitrogenous bases of complementary nucleotides on the opposite strands of DNA. However, the sugar-phosphate backbone provides the structural stability and support for the DNA molecule.

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  • 17. 

    Which is the best meaning for the term transcription?

    • Joining together

    • Writing out

    • Changing from one language to another

    • Erasing

    Correct Answer
    A. Changing from one language to another
    Explanation
    Transcription refers to the process of converting spoken language or audio recordings into written form. This involves accurately representing the words and sounds of one language into another language, making it the best meaning for the term "transcription".

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  • 18. 

    Which organism does not contain DNA?

    • Bacteria

    • Animals

    • Plants

    • Fungi

    Correct Answer
    A. Bacteria
    Explanation
    Bacteria do contain DNA. Bacteria are single-celled organisms that have a simple structure and lack a nucleus. However, they still have DNA, which is organized in a circular chromosome within the cytoplasm. This DNA contains the genetic information necessary for the bacteria to carry out their functions and reproduce. Therefore, the statement that bacteria do not contain DNA is incorrect.

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  • 19. 

    A strand of DNA with the sequence ACTTG serves as a template to form a corresponding sequence with a TGAAC pattern. During which process would this activity occur?

    • Replication

    • Transcription

    • Translation

    • Protein synthesis

    Correct Answer
    A. Replication
    Explanation
    During replication, the DNA molecule is copied to form an identical strand. The template strand, in this case, with the sequence ACTTG, would be used to create a complementary strand with the pattern TGAAC. This process occurs during the S phase of the cell cycle, where the DNA is replicated before cell division. Transcription, translation, and protein synthesis involve the conversion of DNA information into RNA and then into proteins, which is not the case in this scenario. Therefore, replication is the correct process for this activity to occur.

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  • 20. 

    DNA is a strand of genetic material that carries the code for:

    • Proteins

    • Eye color

    • Enzymes

    • Carbohydrates

    Correct Answer
    A. Eye color
    Explanation
    DNA carries the code for eye color. Eye color is determined by the combination of genes inherited from both parents, and these genes are encoded in the DNA. The specific variations in the DNA sequence determine the production of pigments that give rise to different eye colors. Therefore, DNA plays a crucial role in determining an individual's eye color.

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Quiz Review Timeline (Updated): Mar 21, 2023 +

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  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • May 17, 2011
    Quiz Created by
    Cancan23
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