假设有一段mRNA上有60个碱基,其中A有15个,G有25个,那么转录该mRNA的DNA分子区段中,C+T的个数以及该mRNA翻译成的蛋白质所需氨基酸的个数分别是(不考虑终止密码子)
A:60、20
B:80、40
C:40、20
D:40、30
如图所示,最左边的几何体由一个圆柱中挖去一个以圆柱的上底面为底面,下底面圆心为顶点的圆锥而得,现用一个竖直的平面去截这个几何体,则截面图形可能是( )
大面积砍伐森林可能引发的环境问题有( )
关于黄土高原地表形态特征的叙述,正确的是( )
A
Fascinating Plant Show
All kinds of plants from all over the world will surprise you!
Time: 8:00 am—6:00 pm, May 1st—May 10th
Ticket price: ¥10
Place: People's Park
Traffic: No.1 Bus, No.10 Bus, No.12 Bus
Welcome to the Biggest Gardening Club!
Do you like gardening? Do you want to learn how to plant flowers? Please come to the Gardening Club.
Time: 10:00 am—4:30 pm, Wednesday—Sunday
Tel: 15831777899
Mr. Mango's Fruit Store Sale
We have all kinds of fresh fruits on sale. Do you like apples? We have red apples for only ¥2/kilo. We also have mangoes(芒果) for¥6/kilo, watermelons for¥1/kilo and pears for ¥2/kilo. Come and see by yourself.
Time: 8:00 am—8:00 pm
Hotline: 5684764
为下列单词选择对应的图片。
( 1 )chair ____ ( 2 )banana ____
( 3 )kite ____ ( 4 )strawberry ____
( 5 )Ball ____
A. B.
C. D. E.