Genetic Clue to Longevity Uncovered - Revision Units 13-16

C2 Proficiency · Multiple Choice Cloze · Objective Proficiency 2nd Edition, Cambridge University Press

For questions 1–8, read the text below and decide which answer (A, B, C or D) best fits each gap.

induction

intake

input

influx

twins

spouses

peers

fellows

mixed

various

diverse

assorted

revealed

betrayed

disclosed

exhibited

verdict

ruling

decree

finding

imply

assign

direct

apply

lead

steer

draw

prompt

constraint

restriction

prevention

restraint

The life-lengthening properties of reducing calorie (1) ___ were first discovered in the 1930s, when laboratory rodents fed a severely reduced diet were found to outlive their well-fed (2) ___ . Since then, this effect has been observed on organisms as (3) ___ as yeast, flies, worms and dogs. A recent study using nematode worms (4) ___ that a gene called pha-4 plays a key role and the (5) ___ could be important for other species. Mammals, including humans, possess genes that are very similar to the pha-4 gene. Should the longevity link also (6) ___ to human beings, it could well (7) ___ to the development of drugs that mimic the effects of calorie (8) ___ while allowing people to maintain their normal diet.

Genetic Clue to Longevity Uncovered

Available as a free printable PDF worksheet with an optional answer key.

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