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295 questions found · practise this subject as a set
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| # | Question | Subject and topic | Difficulty |
|---|---|---|---|
| 101 | Which bond links adjacent nucleotides in a DNA strand? | Biology/Biological Studies/Biotechnology/Biochemistry DNA structure and packaging |
Easy |
| 102 | A nucleosome core consists of DNA wrapped around | Biology/Biological Studies/Biotechnology/Biochemistry DNA structure and packaging |
Easy |
| 103 | A double-stranded DNA sample has 20% adenine. What is the percentage of guanine? | Biology/Biological Studies/Biotechnology/Biochemistry DNA structure and packaging |
Medium |
| 104 | Why are histone proteins positively charged? | Biology/Biological Studies/Biotechnology/Biochemistry DNA structure and packaging |
Medium |
| 105 | If the distance between two consecutive base pairs is 0.34 nm, what is the approximate total length of DNA in… | Biology/Biological Studies/Biotechnology/Biochemistry DNA structure and packaging |
Hard |
| 106 | Which enzyme joins the discontinuously synthesised fragments of the lagging strand? | Biology/Biological Studies/Biotechnology/Biochemistry DNA replication |
Easy |
| 107 | Meselson and Stahl separated DNA of different densities using | Biology/Biological Studies/Biotechnology/Biochemistry DNA replication |
Easy |
| 108 | In the Meselson–Stahl experiment, what was observed after one generation in ¹⁴N medium? | Biology/Biological Studies/Biotechnology/Biochemistry DNA replication |
Medium |
| 109 | Why is DNA synthesis continuous on one strand but discontinuous on the other? | Biology/Biological Studies/Biotechnology/Biochemistry DNA replication |
Medium |
| 110 | E. coli cells with fully ¹⁵N-labelled DNA are grown in ¹⁴N medium for three generations. What fraction of DNA… | Biology/Biological Studies/Biotechnology/Biochemistry DNA replication |
Hard |
| 111 | In eukaryotes, which RNA polymerase transcribes the precursor of mRNA (hnRNA)? | Biology/Biological Studies/Biotechnology/Biochemistry Transcription |
Easy |
| 112 | The removal of introns and joining of exons in hnRNA is called | Biology/Biological Studies/Biotechnology/Biochemistry Transcription |
Easy |
| 113 | The coding strand of a gene reads 5′-ATGCCA-3′. What will be the sequence of the RNA transcribed from it? | Biology/Biological Studies/Biotechnology/Biochemistry Transcription |
Medium |
| 114 | In bacteria, which factor helps RNA polymerase to terminate transcription? | Biology/Biological Studies/Biotechnology/Biochemistry Transcription |
Medium |
| 115 | Why can translation begin before transcription is complete in bacteria but not in eukaryotes? | Biology/Biological Studies/Biotechnology/Biochemistry Transcription |
Hard |
| 116 | Which codon acts as the start codon and also codes for methionine? | Biology/Biological Studies/Biotechnology/Biochemistry Genetic code and translation |
Easy |
| 117 | The fact that some amino acids are coded by more than one codon shows that the genetic code is | Biology/Biological Studies/Biotechnology/Biochemistry Genetic code and translation |
Easy |
| 118 | Which part of a tRNA recognises the codon on mRNA? | Biology/Biological Studies/Biotechnology/Biochemistry Genetic code and translation |
Medium |
| 119 | The coding region of an mRNA, from the start codon AUG to the stop codon (both included), has 300 nucleotides… | Biology/Biological Studies/Biotechnology/Biochemistry Genetic code and translation |
Medium |
| 120 | In bacteria, which molecule catalyses peptide bond formation during translation? | Biology/Biological Studies/Biotechnology/Biochemistry Genetic code and translation |
Hard |
| 121 | In the lac operon, which gene codes for β-galactosidase? | Biology/Biological Studies/Biotechnology/Biochemistry Regulation of gene expression |
Easy |
| 122 | What is the role of lactose in the lac operon? | Biology/Biological Studies/Biotechnology/Biochemistry Regulation of gene expression |
Easy |
| 123 | In the absence of lactose, the lac operon is switched off because | Biology/Biological Studies/Biotechnology/Biochemistry Regulation of gene expression |
Medium |
| 124 | Regulation of the lac operon by the repressor is an example of | Biology/Biological Studies/Biotechnology/Biochemistry Regulation of gene expression |
Medium |
| 125 | A mutant E. coli has a repressor that cannot bind lactose but can still bind the operator. What will happen w… | Biology/Biological Studies/Biotechnology/Biochemistry Regulation of gene expression |
Hard |
| 126 | In which year was the Human Genome Project completed? | Biology/Biological Studies/Biotechnology/Biochemistry Human Genome Project and DNA fingerprinting |
Easy |
| 127 | Which human chromosome was found to have the fewest genes? | Biology/Biological Studies/Biotechnology/Biochemistry Human Genome Project and DNA fingerprinting |
Easy |
| 128 | The probe used by Alec Jeffreys for DNA fingerprinting was based on | Biology/Biological Studies/Biotechnology/Biochemistry Human Genome Project and DNA fingerprinting |
Medium |
| 129 | What is the correct order of steps in DNA fingerprinting? | Biology/Biological Studies/Biotechnology/Biochemistry Human Genome Project and DNA fingerprinting |
Medium |
| 130 | Why can DNA fingerprinting distinguish between two individuals even though 99.9% of their bases are identical? | Biology/Biological Studies/Biotechnology/Biochemistry Human Genome Project and DNA fingerprinting |
Hard |
| 131 | Which scientist disproved spontaneous generation using pre-sterilised flasks? | Biology/Biological Studies/Biotechnology/Biochemistry Origin of life |
Easy |
| 132 | Which gases did Miller use in his experiment along with water vapour? | Biology/Biological Studies/Biotechnology/Biochemistry Origin of life |
Easy |
| 133 | What was the main product detected in Miller's original experiment? | Biology/Biological Studies/Biotechnology/Biochemistry Origin of life |
Medium |
| 134 | Oparin and Haldane proposed that the first life was preceded by | Biology/Biological Studies/Biotechnology/Biochemistry Origin of life |
Medium |
| 135 | Why was the early Earth's atmosphere important for Miller's results? | Biology/Biological Studies/Biotechnology/Biochemistry Origin of life |
Hard |
| 136 | The forelimbs of a whale, a bat and a human are examples of | Biology/Biological Studies/Biotechnology/Biochemistry Evidence for evolution |
Easy |
| 137 | The wings of a butterfly and of a bird are | Biology/Biological Studies/Biotechnology/Biochemistry Evidence for evolution |
Easy |
| 138 | The thorn of Bougainvillea and the tendril of Cucurbita illustrate | Biology/Biological Studies/Biotechnology/Biochemistry Evidence for evolution |
Medium |
| 139 | In industrial areas of England, dark moths became more common after 1850 mainly because | Biology/Biological Studies/Biotechnology/Biochemistry Evidence for evolution |
Medium |
| 140 | Which pair shows convergent evolution? | Biology/Biological Studies/Biotechnology/Biochemistry Evidence for evolution |
Hard |
| 141 | According to Darwin, the fitness of an individual ultimately refers to its | Biology/Biological Studies/Biotechnology/Biochemistry Darwin and natural selection |
Easy |
| 142 | Darwin's finches of the Galapagos Islands are an example of | Biology/Biological Studies/Biotechnology/Biochemistry Darwin and natural selection |
Easy |
| 143 | Which naturalist independently reached conclusions similar to Darwin's while working in the Malay Archipelago? | Biology/Biological Studies/Biotechnology/Biochemistry Darwin and natural selection |
Medium |
| 144 | Lamarck suggested that the giraffe's long neck arose because ancestors stretched to reach leaves and passed o… | Biology/Biological Studies/Biotechnology/Biochemistry Darwin and natural selection |
Medium |
| 145 | The Tasmanian wolf (a marsupial) and the placental wolf look similar. This similarity is best explained by | Biology/Biological Studies/Biotechnology/Biochemistry Darwin and natural selection |
Hard |
| 146 | Hugo de Vries based his mutation theory on studies of | Biology/Biological Studies/Biotechnology/Biochemistry Mechanisms of evolution |
Easy |
| 147 | A random change in allele frequency in a small population is called | Biology/Biological Studies/Biotechnology/Biochemistry Mechanisms of evolution |
Easy |
| 148 | A small group of birds is blown to an island and starts a new population whose allele frequencies differ from… | Biology/Biological Studies/Biotechnology/Biochemistry Mechanisms of evolution |
Medium |
| 149 | In a bird population, both very small and very large beaks become common while medium beaks become rare. This… | Biology/Biological Studies/Biotechnology/Biochemistry Mechanisms of evolution |
Medium |
| 150 | How do de Vries's mutations differ from the variations Darwin described? | Biology/Biological Studies/Biotechnology/Biochemistry Mechanisms of evolution |
Hard |