Biology, 01.08.2021 18:30 Mexicochan
Người ta nuôi cấy một chủng vi khuẩn E. Coli trong môi trường chỉ chứa đồng vị N14 sau đó thu lấy 100 con chuyển sang môi trường mới có chứa đồng vị N15. Giả sử pha lag kéo dài trong 30 phút, thời gian thế hệ là 20 phút và phân tử ADN của E. Coli có chiều dài 10200A0. Sau 4 giờ 50 phút nếu các tế bào đều phân chia bình thường thì:
a. Có tối đa bào nhiêu khuẩn lạc được tạo ra?
b. Có bao nhiêu liên kết hóa trị trong các phân tử ADN được tạo thành hoàn toàn từ N15? (Chủng vi khuẩn này không có Plasmit).
Answers: 1
Biology, 21.06.2019 21:20
Why does the skin of your finger shrink when you wash clothes for a long time?
Answers: 2
Biology, 22.06.2019 01:00
The sketch shows a rynchosaur, an extinct animal that is known only from fossils. there has been much debate about the classification of these creatures. some scientists suggest that they belong with primitive amphibians, and some think they are related to snakes and lizards.the data equally support both cases. which statement best explains how to draw a cladogram that includes the rynchosaur? draw the cladogram for amphibians. draw the cladogram for reptiles. draw two cladograms, both showing the traits, and leave it as a hypothesis. draw two cladograms, both showing the traits, and have scientists vote
Answers: 2
Biology, 22.06.2019 04:00
Asolution of an enzyme and a substrate was placed in a water bath and the temperature of the reaction was raised gradually. the graph shown was plotted at the end of the experiment. what can be concluded from the graph? a) temperature has no effect on the activity of the enzyme. b) the effect of temperature on the enzyme is unpredictable. c) the enzyme shows increased activity up to a certain temperature. d) the activity of the enzyme is inversely proportional to the temperature.
Answers: 2
Người ta nuôi cấy một chủng vi khuẩn E. Coli trong môi trường chỉ chứa đồng vị N14 sau đó thu lấy 10...
Mathematics, 03.12.2020 01:00
Mathematics, 03.12.2020 01:00
Mathematics, 03.12.2020 01:00
Mathematics, 03.12.2020 01:00
English, 03.12.2020 01:00
Mathematics, 03.12.2020 01:00
Biology, 03.12.2020 01:00
History, 03.12.2020 01:00
Computers and Technology, 03.12.2020 01:00
Mathematics, 03.12.2020 01:00
Mathematics, 03.12.2020 01:00
Mathematics, 03.12.2020 01:00
Mathematics, 03.12.2020 01:00