When a triplet of bases in the coding sequence of DNA is GCA, the corresponding codon for the mRNA that is transcribed from it is:
answer
CGU
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The central dogma of molecular biology state that:
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DNA is transcribed into RNA which is translated into protein.
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A cross between homozygous red-eyed flies and homozygous white-eyed flies results in progeny that all have red eyes. This result demonstrates:
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dominance
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The yeast genome is approximately 1/250 the size of the human genome and yet it contains approximately 1/5 the number of genes. Which of the following is the BEST explanation for this?
answer
the yeast genome contains much less intergenic DNA and fewer introns.
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The double helix model of DNA suggested by Waston and Crick was exciting to the scientific community because:
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it explained how genetic material could be duplicated by means of the complementary strands.
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A "pseudogene" is best defined as:
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a DNA sequence that arose from a duplication of a functional gene, but which itself is not expressed.
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If the probability of a point mutation in a species were 10 -8 per base pari per generation and each gamete in that sepcies contained 3 x 10 -8 base pairs, how many new point mutations would you expect per gamete per generation?
answer
3
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An important difference between mRNA and DNA is:
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mRNA can move throughout the cell, while DNA stays in the nucleus.
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Which of the following nucleotide bases are present in equal amounts in DNA?
answer
both a and c are correct
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From DNA to protein involves which series of events?
answer
transcription, translation.
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Which of the following are always the same in every unit of the DNA molecule?
answer
the sugar and phosphate group.
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The expression of a gene to form a polypeptide occurs in two major steps. What are these two steps in their correct chronological order?
answer
transcription and then translation
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In order for translation to occur:
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there must be large numbers of free amino acids present in the cytosol.
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The complementary base pairs in a DNA molecule are stabilized by:
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hydrogen bond.
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One of the four nucleotide bases in DNA is replaced by a different base in RNA. Which base is it, and what is it replaced by?
answer
thymine, replaced by uracil.
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Transcription is like copying a recipe onto a notecard, EXCEPT:
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the copy is made in code
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The highest percentage of non-coding DNA is found in:
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eukaryotes, with the exception of yeasts.
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Genotype is to phenotype as:
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recipe is to cookie.
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Which of the following correctly describes the locations of transcription and translation within a eukaryotic cell?
answer
DNA is transcribed in the nucleus, then the mRNA transcript is transported to the cytosol to be translated into protein.
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