HL Topic A2.1 Origin of cells - 无忧得胜-网上国际课程 (5edu.win)

1#

1. Why are fatty acids or phospholipids important in the formation oj)gc88x9 irv i4q-z oa/n jus8f cells and their componentso)q -ugx 894c8aj iv/ijs8 nzr?

A. They are soluble.

B. They allow compartmentalisation of cells and organelles.

C. They only allow compartmentalisation of the nucleus.

D. They form cell walls.

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2#

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2. What is the acronym of thedxq.s;5w*)ab adyq7l3 */ ljvqd j2pl organism from which Homo sapiens is believed to have originally evv 5dl)bwps3al;djq2 j. ydq aql**x/ 7olved?

A. LUCY

B. LUCA

C. HOMO

D. HELA

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3#

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3. Which of the following describes a8 em 8irf8d-othe conditions on early, pre-biotic Earth?

A. B. C. D.

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4#

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4. Viruses are said to be non-living.List two reasons q9. p1o2 pcincthat viruses cannot be considered as livinncp2o1qi p .9cg organisms.

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5#

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5. Explain why RNA, rather than DNA, like +q+u5t68ac1vpmy hct ly to be the first genetic material in living15uc+ chp t8a+yv6mtq organisms.

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6#

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6. The Miller-Urey expc( ,hspcn / rhm:q)ze0(n qe)ueriment produced organic molecules in an atmosphere that, in 1952, was thought to have been like the atmosphere on earth prior to the evolution of lif,hc0znrs(c/) q ehp)(:uqne me. In which way was the experiment’s model atmosphere different from today’s scientific understanding of the atmosphere at the origin of life on earth?

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7#

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7. Explain why the conditions on Earth todadwy60 th;,myp 3hk s6by make the spontaneous formation of organic carbon compounds less likely compared to the coythb0hkp;s,66d w ym3nditions on Earth at the time of the origin of life.

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8#

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8. List the essential features that the first cells must have possessedj:wb a;c(m;7/xj pnpf z-u,j uj5 g.oe to be able to live andjpuo:bjaj5. - / cu; ef njzmw;(xgp7, evolve into the life forms that followed.

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