You must design a valid experiment to show that there are microorganisms in the air. what would be your dependent variable? (points : 2) sterilized broth growth of organisms in the broth exposure to microorganisms in the air you must design a valid experiment to show that there are microorganisms in the air. what would be your control group? (points : 2) open flask with unsterilized broth open flask with sterilized broth sealed flask with unsterilized broth sealed flask with sterilized broth

Which of the following is true for a cell that has a flagellum? it cannot be a part of a multicellular organism. it cannot be a part of the oldest known fossil. it cannot have a cell membrane. it cannot have ribosomes.

Toorale man murder mystery < - your lab link 1. how was the toorale man found? 2. what did archaeologists learn about the burial? why is the burial important? 3. what information were the scientists able to learn from the skeleton itself? 4. why is the question of whether the injuries came from a stone or steel weapon important? how could scientists distinguish between the different types of weapons? 5. what did the carbon dating and soil testing tell scientists about toorale man? why are the dates interesting for scientists?

In trying to determine whether dna or protein is the genetic material, hershey and chase made use of which of the following facts? a) dna contains sulfur, whereas protein does not. b) dna contains phosphorus, whereas protein does not. c) dna contains nitrogen, whereas protein does not. d) dna contains purines, whereas protein includes pyrimidines.