【单选题】Read the following paragraph and answer questions 21 and 22. I always knew I wanted to be a marine biologist. When I was six, my parents took me to an aquarium, and I was hooked. But it was in college...
【简答题】阅读理解。 The Book Of Life So far, scientists have named about 1.8 million living species (物种), and that's just a small number of what probably exists on Earth. With so many plants, animal, and other livi...
【单选题】UNIT 3 PART 2 SECTION B TASK 3 There are ten short dialogues and monologues about dreams and reality. Listen carefully, and choose the best answer to each question. (Quetstion 9 to 18 ) Listen to...
【多选题】What is the structure of the Golgi apparatus?
A.
The Golgi apparatus is usually located near the cell nucleus, and in animal cells it is often close to the centrosome, a small cytoskeletal structure near the cell center. The Golgi apparatus consists of a collection of flattened, membrane-enclosed sacs called cisternae, which are piled like stacks of pita bread.
B.
Each stack contains 3–20 cisternae, and the number of Golgi stacks per cell varies greatly depending on the cell type: some cells contain one large stack, while others contain hundreds of very small ones.
C.
Each Golgi stack has two distinct faces: an entry, or ci s , face and an exit, or trans , face. The ci s face is adjacent to the ER, while the trans face points toward the plasma membrane. The outermost cisterna at each face is connected to a network of interconnected membranous tubes and vesicles.
D.
Soluble proteins and pieces of membrane enter the ci s Golgi network via transport vesicles derived from the ER.
【简答题】In the UK, the word “tea” may not only refer to the popular drink or the plant that it is made from, but something else. What is it?A. Anevening meal. As in: What are we eating for tea? B. Atype of cl...