Tenses Worksheet For Class 10
Fill in the blanks with an appropriate tense form. This tenses worksheet is useful for students of classes 9 and 10.
American biologist Craig Venter, who ………1…………. (founded / had founded / has founded) Celera Genomics in 1998 to sequence the human genome, …………2………….. (say / says / was saying) that he has built a synthetic chromosome out of laboratory chemicals. Mycoplasma laboratorium, the chromosome he …………3………. (created / creates / had created), is 381 genes long. When …………4…………. (transplanted / transplanting / transplant) into a living cell, it ……………5……………. (will take / would take / take) control of that cell, and …………6……….. (become / becomes / would become) a new life form.
The genome is the blueprint that …………7…………. (contain / is containing / contains) details of what each individual ought to be like. Every cell in the human body contains a copy of the genome. Each human genome contains 23 chromosomes. Each of these chromosomes contains thousands of genes. These genes …………8…………. (decide / decides / are deciding), for instance, the colour of an individual’s skin, eyes or hair; his/her height; whether he/she is left handed or right handed.
When scientists ……………9………….. (sequenced / sequence / has sequenced) the human genome in 2001, it ……………10…………. (is / was / were) the equivalent of figuring out what language the book of life ……………….11……… (writes / wrote / was written / had written) in and how to read it. Now Venter claims that he and his team of twenty scientists …………12………….. (has figured / figured / had figured / have figured) out the grammar and therefore can write in the new language.
Answers
American biologist Craig Venter, who founded Celera Genomics in 1998 to sequence the human genome, says that he has built a synthetic chromosome out of laboratory chemicals. Mycoplasma laboratorium, the chromosome he created, is 381 genes long. When transplanted into a living cell, it will take control of that cell, and become a new life form.
The genome is the blueprint that contains details of what each individual ought to be like. Every cell in the human body contains a copy of the genome. Each human genome contains 23 chromosomes. Each of these chromosomes contains thousands of genes. These genes decide, for instance, the colour of an individual’s skin, eyes or hair; his/her height; whether he/she is left handed or right handed.
When scientists sequenced the human genome in 2001, it was the equivalent of figuring out what language the book of life was written in and how to read it. Now Venter claims that he and his team of twenty scientists have figured out the grammar and therefore can write in the new language.
