Description : Antiparallel strands of a DNA molecule means that (a) one strand turns clockwise (b) one strand turns anti-clockwise (c) the phosphate groups of two DNA strands, at their ends, share the same position (d) the phosphate groups at the start of two DNA strands are in opposite position (pole).
Last Answer : (d) the phosphate groups at the start of two DNA strands are in opposite position (pole).
Description : Nucleic acids can be detected by means of their absorption maxima near 260 nm. Their absorption in this range is due to (A) Proteins (B) Purines and pyrimidines (C) Ribose (D) Deoxyribose
Last Answer : Answer : B
Description : Which of the following statement(s) is/are true concerning DNA? a. DNA is contained only in the nucleus of the cell b. DNA strands are encoded by the sequence of four bases-adenine, guanine, cytosine ... DNA is the intron, a sequence of three bases d. There are an infinite number of possible codons
Last Answer : Answer: a The genetic blueprint of an organism is carried in the nucleus of every cell, encoded by the sequence of four bases-adenine, guanine, cytosine and thymine, which together make up ... codons. Sixty-one of these code for amino acids and three are termination signals called stop codons
Description : Alkylating agents exert cytotoxic action by inducing: A. Breakage of DNA strand B. Cross linking of DNA strands C. Abnormal pairing of purine and pyrimidine bases D. All of the above
Last Answer : D. All of the above
Description : Pick the right difference between a DNA and RNA a) Sugar and phosphate b) sugar and purines c) purines and phosphate d) sugar and pyrimidines
Last Answer : c) purines and phosphate
Description : The sugar moiety present in DNA is (A) Deoxyribose (B) Ribose (C) Lyxose (D) Ribulose
Last Answer : Answer : A
Description : The sugar found in DNA is (A) Xylose (B) Ribose (C) Deoxyribose (D) Ribulose
Last Answer : C
Description : Polynucleotide chain of DNA contains (a) a nitrogenous base, deoxyribose sugar and phosphate group (b) a nitrogenous base, ribose sugar and phosphate group (c) deoxyribose sugar ribose sugar and phosphate group (d) a nitrogenous base and phosphate group only
Last Answer : Ans:(a)
Description : The hydrophilic nature of DNA is due to the presence of – (1) thymine base (2) Biotic resources (3) phosphate group (4) deoxyribose sugar
Last Answer : (2) Biotic resources Explanation: The phosphate groups on DNA are ionic and charged. Each phosphategroup on the DNA back-bone is one unit of negative charge (-1). Charged molecules ... DNA has two hydrophilic polar external backbones made of sugars and phosphate groups joined by ester bonds.
Description : The hydrophilic nature of DNA is due to the presence of - (1) thymine base (2) a number of hydrogen bonds (3) phosphate group (4) deoxyribose sugar
Last Answer : (2) a number of hydrogen bonds Explanation: The phosphate groups on DNA are ionic and charged. Each phosphate group on the DNA back-bone is one unit of negative charge (-1). Charged ... . DNA has two hydrophilic polar external backbones made of sugars and phosphate groups joined by ester bonds.
Description : DNA synthesis can be specifically measured by estimating the incorporation of radio-labelled (a) thymidine (b) deoxyribose sugar (c) uracil (d) adenine.
Last Answer : (c) uracil
Last Answer : (a) thymidine
Last Answer : (C) Deoxyribose
Description : The hydrophilic nature of DNA is due to the presence of : (1) thymine base (2) a number of hydrogen bonds (3) phosphate group (4) deoxyribose sugar
Last Answer : a number of hydrogen bonds
Description : Which one of the following pairs of nitrogenous bases of nucleic acids, is wrongly matched with the category mentioned against it? (a) Guanine, Adenine - Purines (b) Adenine, Thymine - Purines (c) Thymine, Uracil - Pyrimidines (d) Uracil, Cytosine - Pyrimidines
Last Answer : (b) Adenine, Thymine - Purines
Description : Following statements describe the characteristics of the enzyme restriction endonuclease. Identify the incorrect statement. (a) The enzyme recognises a specific palindromic nucleotide sequence in the DNA. (b) ... (d) The enzyme cuts the sugar-phosphate backbone at specific sites on each strand.
Last Answer : (c) The enzyme binds DNA at specific sites and cuts only one of the two strands.
Description : n the DNA molecule, (a) the proportion of adenine in relation to thymine varies with the organism (b) there are two strands which run anti- parallel-one in 5′ → 3′ direction and other in 3′ → ... is not always equal (d) there are two strands which run parallel in the 5′ → 3′ direction.
Last Answer : (b) there are two strands which run anti- parallel-one in 5′ → 3′ direction and other in 3′ → 5′
Description : B-DNA is: (a) Antiparallel and right handed (b) Antiparallel and left handed (c) Parallel and right handed (d) Parallel and left handed
Last Answer : Ans. ((a))
Description : The structure of DNA is a double helix formed by two strands of DNA sequence. This sequence consists of 4 different nucleotides- Adenine, Thymine, Cytosine and Guanine. How do the nucleotides on one strand interact with the nucleotides on the second strand to maintain the helical shape of DNA?
Last Answer : Complementary Base Pairing. Adenine complementary base pairs with Thymine and Guanine complementary base pairs with Cytosine.
Description : Large cable sizes are formed as individual conductors that may be comprised of several smaller strands to __________. A. obtain the flexibility required for easy handling B. reduce the overall weight of the ... . reduce the number of supports needed for a horizontal overhead run D. all of the above
Last Answer : Answer: A
Description : $ The two strands of a chromosome are called sister chromatids ! The two sister chromatids get separated during Anaphase.
Last Answer : $ The two strands of a chromosome are called sister chromatids ! The two sister chromatids get separated during ... D. If both As and R are wrong.
Description : A DNA with unequal nitrogen bases would most probably be (a) single stranded (b) double stranded (c) triple stranded (d) four stranded
Last Answer : (a) single stranded
Description : A bacterial colony containing DNA made up of 100% N15 nitrogen bases is allowed to replicate in a medium containing N14 bases. After one round of replication the result would be a) All individuals ... Only 50% individuals would be hybrids d) All individuals would have DNA made up of 100% N14
Last Answer : b) All individuals will be hybrids
Description : In DNA, genetic information is located in (A) Purine bases (B) Pyrimidine bases (C) Purine and pyrimidine bases (D) sugar
Last Answer : Answer : C
Description : The four nitrogen atoms of purines are derived from (A) Urea and NH3 (B) NH3, Glycine and Glutamate (C) NH3, Asparate and Glutamate (D) Aspartate, Glutamine and Glycine
Last Answer : Answer : D
Description : Difference between ribose and deoxyribose sugar. -Biology
Last Answer : answer:
Description : The sugar moiety present in RNA is (A) Ribulose (B) Arabinose (C) Ribose (D) Deoxyribose
Description : The sugar found in RNA is (A) Ribose (B) Deoxyribose (C) Ribulose (D) Erythrose
Last Answer : A
Description : Deoxyribose sugar + Nitrogenous base + phosphate group (PO2 )
Last Answer : Ans. Nucleotide
Description : Deoxyribose sugar + Nitrogenous base is
Last Answer : Ans. Nucleoside
Description : Which of the following statements about nucleic acid is most correct? (A) Both pentose nucleic acid and deoxypentose nucleic acid contain the same pyrimidines (B) Both pentose nucleic acid and deoxypentose ... (C) RNA contains cytosine and thymine (D) DNA and RNA are hydrolysed by weak alkali
Description : Identify the correct molecule which controls the biosynthesis of proteins in living organisms. (A) DNA (B) RNA (C) Purines (D) Pyrimidines
Description : .What is it that forms the basis of DNA finger-printing? (a) The relative proportions of purines and pyrimidines in DNA. (b) The relative difference in the DNA occurrence in blood, skin ... ridges and grooves of the fingerprints. (d) Satellite DNA occurring as highly repeated short DNA segments
Last Answer : Satellite DNA occurring as highly repeated short DNA segments
Description : Purines found both in DNA and RNA are (a) cytosine and thymine (b) adenine and thymine (c) adenine and guanine (d) guanine and cytosine.
Last Answer : (c) adenine and guanine
Description : The outside of the DNA double helix is made of alternating groups of deoxyribose sugars and _____.?
Last Answer : phosphates
Description : DNA does not contain (A) Thymine (B) Adenine (C) Uracil (D) Deoxyribose
Description : A carbohydrate found in DNA is (A) Ribose (B) Deoxyribose (C) Ribulose (D) All of these
Last Answer : B
Description : $ Proteins, polysaccharides and nucleic acid are the macromolecules of a cell. ! DNA contains Ribose Sugar.
Last Answer : $ Proteins, polysaccharides and nucleic acid are the macromolecules of a cell. ! DNA contains Ribose Sugar. A ... wrong D. If both As and R are wrong.
Description : The key substance in the synthesis of purine, phosphoribosyl pyrophosphate is formed by (A) α-D-ribose 5-phosphate (B) 5-phospho β-D-ribosylamine (C) D-ribose (D) Deoxyribose
Description : Method of DNA replication in which two strands of DNA separate and synthesise new strands is called (a) dispersive (b) conservative (c) semi-conservative (d) non conservative
Last Answer : (a) dispersive
Description : $ The enzymes which joins short pieces DNA in the laggins strand is called ligase. ! Lagging strand and leading strand are formed due to replication f
Last Answer : $ The enzymes which joins short pieces DNA in the laggins strand is called ligase. ! Lagging strand and ... wrong D. If both As and R are wrong.
Description : The two strands of the DNA double helix are held together by (a) Hydrogen bonds (b)C=C double bonds (c) Hydrophobic bonds (d) Peptide bonds
Description : Give reason: The two strands of DNA molecule are complementary to each other but are not identical.
Last Answer : The two strands of DNA are not identical because the nitrogenous bases are different in pairing. A purine base of one polynucleotide chain always pairs with a pyramidine base on the other. Adenine (A) pairs ... and Cytosine (C) pairs with Thymine (T). Hence the two strands of DNA are complementary.
Description : The figure below shows three steps (A, B, C) of Polymerase Chain Reaction (PCR). Select the option giving correct identification together with what it represents? A. B. C ds DNA 3 5 5 3 ... - extension in the presence of heat stable DNA polymerase (d) A - annealing with two sets of primers
Last Answer : (c) C - extension in the presence of heat stable DNA polymerase
Description : Choose the correct pair from the following. (a) Ligases - Join the two DNA molecules (b) Polymerases - Break the DNA into fragments (c) Nucleases - Separate the two strands of DNA (d) Exonucleases - Make cuts at specific positions within DNA
Last Answer : (a) Ligases - Join the two DNA molecules
Description : Escherichia coli fully labelled with 15N is allowed to grow in 14N medium. The two strands of DNA molecule of the first generation bacteria have (a) different density and do not resemble parent DNA ( ... DNA (c) same density and resemble parent DNA (d) same density but do not resemble parent DNA.
Last Answer : (c) same density and resemble parent DNA
Last Answer : (a) different density and do not resemble parent DNA
Description : In double helix of DNA, the two DNA strands are (a) coiled around a common axis (b) coiled around each other (c) coiled differently (d) coiled over protein sheath.
Last Answer : (a) coiled around a common axis
Description : In a cell the tangled long strands of DNA form the?
Last Answer : In a cell, the tangles of long strands of DNA form the
Description : What is long uncoiled strands of DNA in animal cell?
Last Answer : Need answer