05:12Introduction to nucleic acids and nucleotides | High school biology | Khan AcademyKhan Academy3872
Multiple ChoiceWhich of the following descriptions best fits the class of molecules known as nucleotides?a) A nitrogenous base & a phosphate group.b) A nitrogenous base & a sugar.c) A nitrogenous base, phosphate group & a sugar.d) A nitrogenous base, a carbohydrate, & a sugar.20496Has a video solution.
Multiple ChoiceThe four nitrogenous bases commonly found if DNA are: a) Adenine, thymine, cytosine, uracil b) Uracil, adenine, cytosine, guanine.c) Uracil, cytosine, guanine, thymine.d) Adenine, thymine, cytosine, guanine.e) None are correct.23336Has a video solution.
Multiple ChoiceWhich of the following statements about DNA structure is true?a) The nucleic acid strands in a DNA molecule are oriented antiparallel to each other.b) Nucleic acids are formed through phosphodiester bonds that link complementary nucleobases together.c) Hydrogen bonds formed between the sugar-phosphate backbones of the two DNA chains stabilize the structure.d) The pentose sugar in DNA is ribose (containing two hydroxyl groups).27975Has a video solution.
Multiple ChoiceWhich of the following is true regarding complementary base pairing in DNA and RNA molecules? 853
Multiple ChoiceBased on complementary base pairing, you would expect the percentage of __________ to be equal to the percentage of __________. 458
Multiple ChoiceA shortage of phosphorus in the soil would make it especially difficult for a plant to manufacture __________. 331
Textbook QuestionWhat are the four nitrogenous bases found in RNA? a. cytosine, guanine, thymine, uracil (C, G, T, U) b. adenine, cytosine, guanine, thymine (A, C, G, T) c. adenine, cytosine, guanine, uracil (A, C, G, U) d. alanine, cysteine, glycine, threonine (A, C, G, T)385Has a video solution.
Textbook QuestionWhat determines the primary structure of a DNA molecule? a. stem-and-loop configuration b. complementary base pairing c. deoxyribonucleotide sequence d. hydrophobic interactions and hydrogen bonding511Has a video solution.
Textbook QuestionEvaluate the following statements related to the synthesis of nucleic acids. Select True or False for each statement. T/F Ribonucleotides are added to the 3′ end of a DNA strand. T/F Polymerization of nucleic acids occurs by the formation of phosphodiester bonds. T/F Complementary pairing between sugars is required for copying nucleic acids. T/F Strands in a double helix are synthesized in an antiparallel orientation.448Has a video solution.
Textbook QuestionSingle strands of nucleic acids are directional, meaning that there are two different ends. What functional groups define the two different ends of a strand?764Has a video solution.
Textbook QuestionWhat is responsible for the increased stability of DNA compared to RNA?547Has a video solution.
Textbook QuestionEnzymes that break down DNA catalyze the hydrolysis of the covalent bonds that join nucleotides together. What would happen to DNA molecules treated with these enzymes? a. The two strands of the double helix would separate. b. The phosphodiester linkages of the polynucleotide backbone would be broken. c. The pyrimidines would be separated from the deoxyribose sugars. d. All bases would be separated from the deoxyribose sugars.1289Has a video solution.
Textbook QuestionIf nucleotides from the DNA of a human were quantified and 30 percent of them contained the base adenine, what percentage of them would contain the base guanine? a. 20 percent b. 30 percent c. 40 percent d. 70 percent295Has a video solution.
Textbook QuestionWhich of the following pairs of base sequences could form a short stretch of a normal double helix of DNA? a. 5′-AGCT-3′ with 5′-TCGA-3′ b. 5′-GCGC-3′ with 5′-TATA-3′ c. 5′-ATGC-3′ with 5′-GCAT-3′ d. All of these pairs are correct.1292Has a video solution.
Textbook QuestionA shortage of phosphorus in the soil would make it especially difficult for a plant to manufacture a. DNA. b. proteins. c. cellulose. d. sucrose.543Has a video solution.
Textbook QuestionWhat would be the sequence of the strand of DNA that is made from the following template: 5′-GATATCGAT-3′? (Your answer must be written 5'→3'.) How would the sequence be different if RNA were made from this DNA template?346Has a video solution.
Textbook QuestionAccording to the RNA world model, a ribozyme would replicate by creating a double-stranded RNA intermediate. Would you expect the intermediate to have the same catalytic activity as the original ribozyme? Justify your answer with an explanation.343Has a video solution.
Textbook QuestionMake a concept map (see BioSkills 12) that relates DNA's primary structure to its secondary structure. Your diagram should include deoxyribonucleotides, base-stacking interactions, purines, pyrimidines, phosphodiester linkages, DNA's primary structure, DNA's secondary structure, complementary base pairing, and antiparallel double helix.298Has a video solution.
Textbook QuestionRNA and DNA are similar because                   . a. both are double-stranded helices; b. uracil is found in both of them; c. both contain the sugar deoxyribose; d. both are made up of nucleotides consisting of a sugar, a phosphate, and a base694Has a video solution.
Textbook QuestionDRAW IT Copy the polynucleotide strand in Figure 5.23a and label the bases G, T, C, and T, starting from the 5′ end. Assuming this is a DNA polynucleotide, now draw the complementary strand, using the same symbols for phosphates (circles), sugars (pentagons), and bases. Label the bases. Draw arrows showing the 5'→3' direction of each strand. Use the arrows to make sure the second strand is antiparallel to the first. Hint: After you draw the first strand vertically, turn the paper upside down; it is easier to draw the second strand from the 5′ toward the 3′ direction as you go from top to bottom.229Has a video solution.
Textbook QuestionIn the field of nanotechnology, DNA is used like Velcro to assemble tiny particles into structures that are < 0.0001 mm in size. Draw a model to illustrate how two particles (a circle and a square) could be brought together by linking them to short single-stranded DNA molecules. If the DNA sequence linked to the circle is GGATC, then provide the sequence linked to the square and identify the 5′ and 3′ ends of each strand.366Has a video solution.
Textbook QuestionExplain the role of complementary base pairing in the functions of nucleic acids.241Has a video solution.
