Một biện pháp giúp hạn chế hậu quả khi truy cập vào đường liên kết lạ là

Có x tế bào sinh dục tiến hành giảm phân, trong quá trình đó có bao nhiêu thoi phân vào được hình thành?

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the best answer to each of the following questions from 31 to 40.

Biting into a ripe, juicy fruit brings a smile to many people’s faces. But eating that same fruit a week before it is ripe probably wouldn’t be as enjoyable! Unripe fruits are often hard and bitter, but that serves a purpose. The hard exterior of an unripe fruit protects the developing seed inside. After a seed fully develops inside the fruit, the fruit changes color, softens, and gets sweeter to become more attractive to animals and humans. These organisms eat the fruit and spread its seeds, ensuring the plant’s survival and regrowth.

But how does a fruit ripen? The ripening process involves many complex chemical reactions. When a fruit ripens, it goes through a chemical change. A chemical change happens when bonds within molecules break, and the atoms that once formed them regroup into new molecules. Chemical changes are irreversible. Once a fruit ripens, it cannot become unripe again.

One molecule responsible for this chemical change is ethylene. Ethylene (C2H4) is a colorless gas made up of carbon and hydrogen atoms. (I). It is a naturally occurring molecule in the atmosphere. (II). It is also an important plant hormone. (III). Plants release ethylene through the growing tips of roots, flowers, and ripening fruit. (IV). Although ethylene serves other purposes in plants, one of its main purposes is to trigger the chemical reactions that cause fruits to ripen. As the fruit matures, oxygen in the air helps stimulate the production of ethylene. This ethylene production is a signal that begins fruit ripening. For that reason, unripe fruits have low levels of ethylene, while ripe fruits have higher levels of ethylene. Most fruits produce ethylene and respond to ethylene in the atmosphere.

Although fruits require ethylene to ripen, different types of fruits respond to this molecule in two distinct ways: non-climacteric fruits and climacteric fruits. Non-climacteric fruits do not ripen after harvesting. They produce very little ethylene of their own. Climacteric fruits, on the other hand, continue to ripen after they are picked. These fruits produce a large amount of ethylene. Climacteric fruits can also speed up the ripening process of other fruits nearby since they release high levels of ethylene into the air.  

According to the passage, which of the following is NOT a factor in fruit ripening?

Cho biết: Nhân tố nào sẽ ảnh hưởng đến tốc độ gia tăng dân số?

Đâu là nhận định sai khi nói về thị trường?

Chọn ý đúng: Chọn lọc hỗn hợp áp dụng với loại cây nào?

Xác định tổng số electron, proton và neutron trong một phân tử nước (H₂O). Biết rằng trong phân tử này, nguyên tử H được tạo nên từ 1 proton và 1 electron, còn nguyên tử O chứa 8 neutron và 8 proton.

- Tổng số hạt electron là .

- Tổng số hạt proton là .

Biểu thức của moment của một lực với một trụng quay là

Các doanh nghiệp sản xuất giấy của Việt Nam luôn phải chú trọng cải tiến kĩ thuật, đổi mới công nghệ sản xuất là đang đảm bảo cơ chế thị trường theo nguyên tắc của quy luật nào?

Tập hợp $A$ gồm các số nguyên dương chẵn nhỏ hơn hoặc bằng $10$ là

Môđun của số phức \(3i+1\) bằng?

Chọn từ thích hợp điền vào chỗ chấm để hoàn thiện khái niệm sau:

“…… là sự tiến bộ về vật chất và tinh thần của xã hội loài người; là trạng thái phát triển cao của nền văn hóa, khi xã hội loài người vượt quan trình độ của thời kì dã man”.

A human-like robot that can drive a car could one day be used as a chauffeur, though its creator admits that this may take at least 50 years.

Most driverless cars work very differently to a human driver, using artificial intelligence and custom mechanical systems to directly move the steering wheel and pedals. This approach is much more efficient and simpler than using a robot to drive, but it is also specially made for each particular car.

Kento Kawaharazuka at the University of Tokyo and his colleagues have developed a human-like robot, called Musashi, that can drive a car in the same way as a human. It has a human-like “skeleton” and “musculature”, as well as cameras in each of its eyes and force sensors in its hands and feet. Artificial intelligence systems work out what actions are needed to drive the car and react to events that often happen on roads such as traffic lights changing colour or a person stepping in front of the car. The robot can only perform a limited range of driving tasks at present, such as going forward in a straight line, taking a right- hand turn, and moving at speeds of around five kilometres per hour on non-public roads. “The speed of the pedal or the velocity of the car is not high. Also, the handling of the car is not fast compared to human beings,” says Kawaharazuka.

It seems that a robot at the controls of a car, operating in real traffic conditions and in total safety, is not something we are likely to see soon. As mentioned earlier, it could be decades before a robot could really step into the driver’s seat.

What is the main topic of paragraph 3?

Các chủ thể tiêu dùng cần phải có những trách nhiệm gì khi tham gia vào hoạt động kinh tế?

Ý nào dưới đây là nói về thuế gián thu?

Kênh đào Pa-na-ma nối hai đại dương nào với nhau?

Cho các yếu tố dưới đây:

(1) Enzyme tạo mồi.            (2) DNA ligase.

(3) DNA polymerase.         (4) DNA khuôn.

(5) Ribonucleotide.             (6) Nucleotide.

Có bao nhiêu yếu tố tham gia vào quá trình nhân đôi của gene ở sinh vật nhân sơ?

Mark the letter A, B, C or D on your answer sheet to indicate the best arrangement of utterances or sentences to make a meaningful exchange or text in each of the following questionsfrom 13 to 17.

a. Robocon is an international robotics competition where university teams design and build robots to complete specific tasks.

b. Teams from around the world participate, showcasing creativity, problem-solving skills, and technical expertise.

c. Robots must follow strict rules and complete assigned tasks within a set time limit, testing their efficiency and adaptability.

d. Over the years, the competition has expanded, providing students with a platform to improve their engineering knowledge and teamwork.

e. Robocon promotes STEM education and inspires future engineers to explore robotics and innovation.

Đâu là cơ quan thoát hơi nước của cây?