Science Homework Help

QUESTION 1

1. a) Why isn’t lactose absorbed by the small intestine in someone who is lactose intolerant? b) Why do the organic acids (acetic and lactic) cause diarrhea in a lactose intolerant person?

2. QUESTION 2

   1. Step 1: Why is it necessary to emulsify large fat droplets?
      Step 2: What enzymes break down triglycerides, and what are the enzymatic products?
      Step 3a. What types of lipid molecules are absorbed?
      Step 4. Why are triglycerides re-synthesized and packaged into chylomicrons?
      Step 5. Important detail: Chylomicrons enter the lymphatic system, not the circulatory system. Why is this?
      

      Zombie Apocalypse Bonus Activity

      Manhattan is ground zero for an invasion of the living dead. The origin of the first case remains unknown, but the number of flesh-eating zombies is growing exponentially*. Food abounds in the densely-populated Gotham City, and it is now common to see people being eaten alive on the street.The only known method for killing the zombies permanently is a gunshot wound to the head, or some other method that destroys their brains. This approach is proving ineffectual. Their numbers are growing unchecked and panic has gripped the City. Even trained military sharpshooters are unable to eliminate the ghouls fast enough to outpace their emergence.You make a key observation when you see a group of zombies crowded around a leaky fire hydrant, eagerly lapping up water. You surmise that their high-protein diet generates a lot of nitrogenous waste products. In addition to a nervous system for controlling locomotion, you realize that the living dead must have a way to eliminate nitrogenous wastes. Anecdotal reports have surfaced that zombies have kidney-like structures, but you know that shooting their kidneys with bullets will be even more ineffectual than shooting their brains; another approach is necessary. Your objective is to develop a method for permanently killing zombies that targets their ability to eliminate nitrogenous wastes. You must also address the potential impact your method will have on the normal human population.This activity is worth 25 bonus points and is due April 30 at 11:59pm.

      • Do NOT propose shooting the zombies with any sort of conventional projectile (such as a bullet).
      • Do NOT propose restricting the zombie’s access to water.
      • You MUST address how your approach will impact the human population and how you will limit collateral damage.

      *The condition of being a ’zombie’ (also known as ‘the living dead’ or ‘walking dead’ or ‘undead’) is recognized by the medical community as Ataxic Neurodegenerative Satiety Deficiency Syndrome (ANSDS). The syndrome is thought to be caused by an airborne prion; the prion can also be passed to victims through a bite that breaks the skin. Symptoms include progressive loss of brain tissue, uncoordinated (ataxic) gait, and an insatiable hunger for human flesh.This activity was inspired by:https://www.cdc.gov/cpr/zombie/index.htmThe Zombie Autopsies: Secret Notebooks from the Apocalypse, by Steven C. Schlozman, MD