Item 36 36 of 41> Part A - Which best describes why giraffes have evolved to hav

Question

Item 36 36 of 41> Part A - Which best describes why giraffes have evolved to have tall necks? O The tall-necked giraffes had better access to more food, thus had better survival success as well as reproductive success O The tall-necked giraffes where better suited to fight off short-necked giraffes which led to selective death of short-necked giraffes O The tall-necked giraffes had more access to food and survived. All giraffes have the same length necks at first, but some are able to stretch their necks repeatedly which leads to a permanently tall neck.

Explanation / Answer

1) the long neck helps in accessing to more food thus better survival and their progeny will have the same advantages so better reproductive success. option A.

2) E.coli have no ability to excise introns from a gene. so before making insulin or any other gene product first we have to make a cDNA from the mRNA of that particular gene. this process requires reverse transcriptase enzyme. thus it creates an intronless gene. option D.

3) option D. metastasis is a process by which cancerous cells move from one part of the body to another part of the body.

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