September 21, 2017

A characteristic common to both diffusion and active transport is that

(1) enzymes are required
(2) oxygen is moved across a membrane

(3) ATP is needed
(4) the movement of molecules occurs 

Answer and Explanation: Diffusion is the movement of molecules from the region of higher to the region of lower concentration.  Diffusion occurs passively, which means that there is no energy input in order to make the molecules move. A...

September 18, 2017

  1. Which cellular change in an organism could be inherited by the next generation?

    1.  a change in the ribosomes in the pancreas of a squirrel

    2.  the deletion of a single DNA base in a sperm cell of a trout

    3.  a decrease in the size of a vacuole in a rose leaf cell

    4. the transfer of a piece of a chromosome in the skin cell of a raccoon

Answer and Explanation: 

In order for a cel...

August 15, 2017

Gall bladder stores bile. Bile is released into duodenum (first part of small intestine) to help with fat digestion and absorption.

 How does bile work? Bile is composed of salts, which are ionic compounds. Fats are nonpolar molecules that clump up together in the polar environment of the duodenum. Therefore, we need something to separate them and allow for the digestive enzymes to get to work. And that's what bile salts...

August 12, 2017

Have you ever noticed "goose bumps" or the hair on your arms "standing up" ? When does it happen and why?

If you pay close attention, you would see that we get goose bumps when it is chilly. Therefore, this has to be a mechanism to regulate our body temperature and warm us up. Does it happen only in humans? Not at all! This mechanism of keeping warm is common to many mammals. 

The principle behind the mechanism is that ti...

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