OBJECTIVE LIFE SCIENCE
GENETICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A human cell has between 20 000 and 25 000 genes whereas an E. coli cell has approximately 4000 genes. Which of the following statements is true?
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The human genome is larger than the E. coli genome
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There are more genes on each human chromosome than on the E. coli chromosome.
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The human cell and the E. coli cell produce approximately the same variety of proteins
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The DNA in both organisms is associated with histones (proteins).
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Explanation:
Detailed explanation-1: -After the Human Genome Project, scientists found that there were around 20, 000 genes within the genome, a number that some researchers had already predicted. Remarkably, these genes comprise only about 1-2% of the 3 billion base pairs of DNA [].
Detailed explanation-2: -coli, for example, consists of approximately 4.6 million base pairs and encodes about 4000 different proteins. The human genome is nearly a thousand times more complex (approximately 3 billion base pairs) and encodes about 100, 000 different proteins (see Table 1.2).
There is 1 question to complete.