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2 tan 7 ta =27 ta
Con bo nang : 27-25=2 ta
Ca 2 con nang : 27+2=29 ta
2 tan 7 ta =27 ta
Con bo nang : 27-25=2 ta
Ca 2 con nang : 27+2=29 ta
2 tấn 7 tạ =27 tạ
Con bò nặng
27-25=2 tạ
Tổng số cân nặng của con bò và con voi là
27+2=29 tạ
có môt chiếc máy bay chở 500 trái sầu riêng hỏi rớt một trái sầu riêng còn bao nhiêu trái ? còn 499 trái sầu riêng
vì sao bà cụ qua cầu bị chết ? Vì bị sầu riêng rơi trúng đầu
làm thế nào để nhét con voi vô tủ lạnh? mở của tủ ra cho con voi vào rồi đóng cửa tủ lạnh vào
Trên triều đình mời tất cả các con vật lên hỏi vì sao con voi ko lên họp? con voi đang trong tủ lạnh
1.còn 499 trái sầu riêng
2.vì bị sầu riêng rơi trúng đầu
3.mở cửa tủ lạnh ra rồi nhét con voi vào
4.vì nó ở trong tủ lạnh rồi ko lên được
Đáp án C
Sự tương đồng về đặc điểm giải phẫu giữa các loài => bằng chứng giải phẫu học so sánh
Tất cả các loài đều được cấu tạo từ tế bào => bằng chứng sinh học tế bào
Bằng chứng sinh học phân tử là những bằng chứng liên quan đến các loại phân tử nhỏ như ADN và protein, những phân tử quy định thông tin di truyền của cơ thể và thực hiện chức năng trong tế bào
Các ý đúng: 1,3,4
a) Đổi 1 tạ 40 kg = 140 kg
Con bò nặng số ki lô-gam là:
140 + 220 = 360 (kg)
Con bò và con bê nặng tất cả số kg là:
360 + 140 = 500 (kg)
b) Cân nặng của con voi là:
500 × 2 = 1 000 (kg) = 1 tấn
Đáp số: a) 500 kg
b) 1 tấn
a) Con bê cân nặng 1 tạ 40 kg. Con bò nặng hơn con bê là 220 kg. Hỏi con bò và con bê nặng tất cả bao nhiêu ki-lô-gam”?
Ta có: 1 tạ 40kg = 140 kg
=> Số kg Con bò là:
140 + 220 = 360kg
Số kg con bê và con bò là:
140 + 360= 500
b) Số tấn con voi cân nặng là:
500 x 2 = 1000 kg = 1 tấn
Chọn đáp án A
Bằng chứng sinh học phân tử liên quan đến mã di truyền, ADN, protein,... Chọn 1, 3, 4.
Chọn đáp án A
Bằng chứng sinh học phân tử liên quan đến mã di truyền, ADN, protein,... Chọn 1, 3, 4.
STUDY TIP
- Cơ sở vật chất chủ yếu của sự sống là các đại phân tử: ADN, ARN và protein.
- Tất cả các loại có vật chất di truyền là ADN trừ một số loại virut có vật chất di truyền là ARN. ADN có vai trò là vật chất mang thông tin di truyền. ADN của các loài đều được cấu tạo từ 4 loại nuclêôtit. ADN có vai trò mang và truyền đạt thông tin di truyền.
ADN của các loài khác nhau ở thành phần, số lượng, trình tự sắp xếp của các loại nuclêôtit. Chính các yếu tố này tạo nên tính đặc trưng cho phân tử ADN của mỗi loài. Sự giống và khác nhau nhiều hay ít về thành phần số lượng và đặc biệt trật tự sắp xếp của các nucleotit phản ánh mức độ quan hệ họ hàng giữa các loài
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