Arrange the following sequence of procedures in the proper order in this experiment done to determine proteins present in pea plants during germination. 1. Load the proteins in polyacrylamide gel electrophoresis and separate them 2. Break the cells by grinding them in liquid nitrogen and suspending in a buffer 3. Select a suitable tissue to isolate proteins expressed only during germination 4. Centrifuge the broken cells to purify proteins from other molecules

What type of lipids are found in all biological membranes?

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.