The enzyme phosphofructokinase (PFK) from E. coli is a tetrameric enzyme that allosterically binds AMP. The binding of AMP increases the affinity of the substrates for the active site of PFK. Which of the following is true concerning this system?

A. AMP is a competitive inhibitor. B. AMP is an allosteric activator and will stabilize PFK in a conformation that will require less substrate to achieve 1/2 Vmax. C. AMP is an allosteric inhibitor and will stabilize PFK in a conformation that will require more substrate to achieve 1/2 Vmax. D. AMP is a cofactor/coenzyme for PFK and is absolutely required for PFK activity.

You have 2 plants of the same type and same size, same amount of leaves. one of them is put inside the house and the other one is put in the balcony. you water them saturday, one plant with 200 ml and the other with 400 ml of water. which one of your plants need less water? explain.

With the description of the different cell walls, membranes, and associated proteins set in the students' minds, you now need to introduce them to the idea that the cell wall can also act as a foundation to build things upon. bacterial appendages require a strong foundation that will offer the support needed to move and function in a dynamic world. for example, flagella are long, whiplike protein structures that are used by many gram-positive and gram-negative bacteria for locomotion. in order to function effectively, a flagellum must be firmly anchored to the cell wall. how will you be able to get across the idea that the peptidoglycan cell wall is strong enough to support such a mechanism? with a protein rod that passes through the cell wall and protein rings used to anchor it in the membranes, these basal bodies are the rudimentary biological motors that use atp power to spin the hook and the flagella attached to it. bacterial flagella have a biological motor that spins within the cell wall and is powered by atp. this allows the flagella to spin in a whiplike motion to propel the bacterium.

What would be the result if crossing over did not happen during meiosis in humans? a. there would be less genetic variation in humans. b. parents would be more likely to look like their children. c. the human population could not reproduce. d. children would have more chromosomes.