Câu hỏi:
13/03/2020 1,515Read the following passage and mark the letter A, B, C or D to indicate the correct answer to each of the questions from 36 to 42.
Light from a living plant or animal is called bioluminescence, or cold light, to distinguish it from incandescence or heat-generating light. Life forms could not produce incandescent light without being burned. Their light is produced in chemicals combining in such a way that little or no measurable heat is produced, and the life forms generating it are unharmed. Although bioluminescence is a relatively complicated process, it can be reduced to simple terms. Living light occurs when luciferin and oxygen combine in the presence of luciferase. In a few cases, fireflies the most common, an additional compound called ATP is required.
The earliest recorded experiments with bioluminescence in the late 1800s are attributed to Raphael Dubois, who extracted a luminous fluid from a clam, observing that it continued to glow in the test tube for several minutes. He named the substance luciferin, which means “the bearer of life”. In further research, Dubois discovered that several chemicals were required for bioluminescence to occur. In his notes, it was recorded that a second important substance, which he called luciferase, was always present. In later study of small, luminous sea creatures, Newton Harley concluded that luciferin was composed of carbon, hydrogen, and oxygen, which are the building blocks of all living cells. He also proved that there are a variety of luciferin and luciferase, specific to the plants and animals that produce them.
Much remains unknown, but many scientists who are studying bioluminescence now believe that the origin of the phenomenon may be traced to a time when there was no oxygen in the Earth’s atmosphere. When oxygen was gradually introduced to the atmosphere, it was actually poisonous to life forms, plants and animals produced light to use up the oxygen in a gradual but necessary adaptation. It is speculated that millions of years ago, all life may have produced light to survive. As the millennia passed, life forms on Earth became tolerant of, and finally dependent on oxygen, and the adaptation that produced bioluminescence was no longer necessary, but some primitive plants and animals continued to use the light for new functions such as mating or attracting prey.
Question 36: Which of the following is the main topic of the passage?
Sách mới 2k7: 30 đề đánh giá năng lực DHQG Hà Nội, Tp. Hồ Chí Minh, BKHN 2025 mới nhất (600 trang - chỉ từ 160k).
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Trả lời:
Đáp án A
Dịch nghĩa: Chủ đề chính của bài viết là gì?
A. Ánh sáng lạnh
B. Luciferase
C. Thực vật và động vật nguyên thủy
D. Khi hậu trên trái đất
Giải thích: Ta thấy đoạn văn chủ yếu nói về bioluminescence (sự phát quang sinh học) hay còn gọi là cold light (ánh sáng lạnh)
Đã bán 152
Đã bán 114
Đã bán 132
Đã bán 47
CÂU HỎI HOT CÙNG CHỦ ĐỀ
Câu 1:
Mark the letter A, B, C or D to indicate the word/phrases SIMILAR in meaning to the underlined word(s) in each of the following questions.
Question 22: The United Nations Educational, Scientific and Cultural Organization (UNESCO), was established in 1946.
Câu 2:
Mark the letter A, B, C or D to indicate the word/phrases SIMILAR in meaning to the underlined word(s) in each of the following questions.
Question 23: Paris is the ideal place to learn French; it’s a beautiful and hospitable city with Institutions for high quality linguistic teaching.
Câu 3:
Mark the letter A, B, C or D to indicate the correct answer to each of the following questions.
Question 19: Everybody in the house woke up when the burglar alarm ______.
Câu 4:
Mark the letter A, B, C or D to indicate the word or phrase that is OPPOSITE in meaning to the underlined part in each of the following questions.
Question 24: I would be happy to go along with the idea.
Câu 5:
Mark the letter A, B, C or D to indicate the correct answer to each of the following questions.
Question 8: Although thunder and lightning are produced at the same time, light waves travel faster _____, so we see the lightening before we hear the thunder.
Câu 6:
Mark the letter A, B, C or D to indicate the correct answer to each of the following questions.
Question 12: 500 years ago, the average human ______ was about 40 years.
Câu 7:
Mark the letter A, B, C or D to indicate the sentence that is closest in meaning to each of the following questions.
Question 27: James should have been told the news a long time ago.
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