Đặc điểm nào có ở giảm phân mà không có ở nguyên phân?

Read the following passage about human life expectancy 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 23 to 30. 

How long will a baby born today live? 100 years? 120 years? Scientists are studying genes that could mean long life for us all.

There are already many, many people who have passed the landmark age of 100. In fact, there are now so many healthy, elderly people that there’s a name for them: the wellderly. These are people over the age of eighty who have no major illnesses, such as high blood pressure, heart disease or diabetes.

There are many scientific studies of communities where healthy old age is typical. These include places like Calabria in southern Italy and the island of Okinawa in Japan. In Calabria, the small village of Molochio has about 2,000 inhabitants. And of these, there are at least eight people over a hundred years old. When researchers ask people like this the secret of their long life, the answer is almost always about food and is almost always the same: ‘I eat a lot of fruit and vegetables.’ ‘I eat a little bit of everything.’ ‘I neither smoke nor drink.’

In the past, scientists looked at things such as diet and lifestyle for an explanation of long life, but these days they are also looking at genetics. Researcher Eric Topol says that there must be genes that explain why people are protected from the effects of aging process. The new research into long life did scrutinize groups of people who have a genetic connection. One interesting group lives in Ecuador. In one area of the country there are a number of people with the same genetic condition. It’s called Laron syndrome. These people don’t grow very tall – just over one metre. But Laron syndrome also give them protection against cancer and diabetes. As a result, they live longer than other people in their families. Meanwhile, on the Hawaiian island of Oahu, there’s another group of long-lived men, Japanese-Americans. They have a similar gene to the Laron syndrome group.

Back in Calabria, researchers constructed the family trees of the 100-year-old people. They looked at family information from the 19th century to today. It is concluded that there are genetic factors that give health benefits to the men. This is a surprising result because generally in Europe, women live longer than men. So what really makes people live longer? It seems likely that it is an interaction of genes, the environment and probably a third factor – luck.

Which of the following is NOT true about the Laron syndrome?

Hoạt động sản xuất có tác động như thế nào đến các hoạt động phân phối – trao đổi, tiêu dùng?

Copper(II) oxide (CuO) bị khử bởi ammonia (NH₃) theo phản ứng sau:

NH₃ + CuO → Cu + N₂ + H₂O

Tổng hệ số cân bằng (là số nguyên, tối giản) của chất tham gia phản ứng là

Read the following passage about the impact of social media on mental health and mark the letter A, B, C, or D on your answer sheet to indicate the best answer to each of the following questions

[I] In recent years, social media platforms have become a central part of daily life, offering users countless ways to connect, share, and communicate. [II] While these platforms offer many advantages, experts have noted rising concerns about their effects on mental health, particularly among young people (Smith & Anderson, 2018). [III] Studies reveal that excessive social media use can contribute to feelings of anxiety, depression, and loneliness, despite its intention to promote connection and social interaction (Twenge & Campbell, 2019). [IV]

A primary reason for these mental health concerns is the tendency for social media users to compare themselves to others. Platforms like Instagram and Facebook often highlight idealized lifestyles, leading users to feel inadequate about their own lives. Additionally, the constant notifications and messages contribute to a "fear of missing out," or FOMO, which keeps individuals in a cycle of checking their phones, often reducing the quality of sleep and overall well-being.

There is also a growing body of research suggesting a link between social media use and decreased attention spans. When users frequently switch between apps and notifications, their ability to focus for extended periods may diminish (Rosen, 2019). This shift in attention can interfere with productivity, especially in academic and professional settings, where sustained focus is essential.

Addressing these challenges requires a multi-faceted approach. Some mental health professionals suggest limiting screen time and setting boundaries, such as "device-free" hours before bedtime. Others recommend engaging in offline activities, like reading or exercising, to reduce dependence on social media and build healthier habits. According to psychologists, such strategies can bu mental resilience and allow for more meaningful, balanced relationships (Robinson & Smith, 2020).

The phrase "fear of missing out" in paragraph 2 could be best replaced by ____.

A và B là 2 hãng nước hoa nổi tiếng trên thị trường. Hãng nước hoa A đã sử dụng hình ảnh che mờ của hãng B trong đoạn quảng cáo để so sánh sản phẩm về giá cả, chất lượng giữa 2 sản phẩm. Hành vi của hãng nước hoa A trường hợp trên, thể hiện nhược điểm gì của cơ chế thị trường?

Rãnh xéc măng được bố trí ở vị trí nào trên pit tông?

Choose A, B, C or D to answer each question.

The members of a city council wanted to assess the opinions of all city residents about converting an open field into a dog park. The council surveyed a sample of 500 city residents who own dogs. The survey showed that the majority of those sampled were in favor of the dog park. Which of the following is true about the city council’s survey?

Ở người, tế bào da sinh ra các tế bào da mới có đặc điểm gì?

Xác định một từ/ cụm từ SAI về ngữ pháp hoặc ngữ nghĩa, logic, phong cách.

Tuần qua, miền Bắc liên tục có mưa rào, giông khiến nhiều nơi có mưa lớn do ảnh hưởng của rãnh áp thấp, đến hôm nay, rãnh áp thấp suy yếu, miền Bắc giảm dần mưa, trời nắng trở lại.

Kết quả của chương trình sau là gì?

A = [2, 3, 5, "python", 6]

A.append(4)

A.append(2)

A.append("x")

del(A[2])

print(len(A))

Theo nguyên lí Pauli

Cộng hòa Nam Phi tiếp giáp với các đại dương nào sau đây?

Những tổ chức, cá nhân giữ vai trò kết nối giữa người tiêu dùng và người sản xuất trong nền kinh tế được gọi là gì?

Đâu không phải là ứng dụng của quá trình tổng hợp amino acid và protein ở vi sinh vật?

Đầu thế kỉ XX, nước Nga đứng trước tình thế gì?

Đặc điểm nào sau đây của đất ở vùng Đồng bằng sông Cửu Long thuận lợi để phát triển vùng chuyên canh cây lương thực?

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 questions from 13 to 17

a. Another challenge is limited access to learning resources, but this can be overcome by using online platforms and seeking mentors for support. 

b. Additionally, adapting to new technologies can be difficult, especially for older learners, but they can improve their digital skills and use user-friendly platforms. 

c. One challenge is balancing learning with work, family, and other commitments, which can be managed by prioritizing tasks, creating schedules, and using technology for on-the-go learning.

d. In today’s rapidly changing world, lifelong learning is crucial for personal and professional growth, but it comes with challenges.

e. Overall, by staying adaptable and proactive, lifelong learners can overcome obstacles and continue to grow.

Dao động tắt dần

Cho ba tập hợp:

$D = \{n\in \N \, | \, n$ $\vdots$ $10\}$; $B = \{n\in \N \, | \, n$ $\vdots$ $5\}$;

$X = \{n\in \N \, | \, n$ $\vdots$ $2\}$.

Mỗi mệnh đề sau đúng hay sai?

Cho hàm số lượng giác \(f\left( x \right)=\text{sin}\left( 5x-\frac{\pi }{4} \right)\).

Tìm chu kỳ T của hàm số.