Explore BrainMass

Life on Earth - 8 Short Questions.

This content was STOLEN from BrainMass.com - View the original, and get the already-completed solution here!

Life on Earth - Biological Concepts from the Non-Science Major Perspective

Quiz: (1 point each)

1. Describe the difference between and exergonic and endergonic reaction?

2. Why do environmentalists claim that an increase in forests, i.e. rainforests, will slow down the effects of global warming?

3. Explain how fats and proteins may be utilized as fuels in the cells?

4. Describe the function of a catalyst in a biochemical reaction.

5. List 4 factors that influence the rate of photosynthesis.

6. How does the structure of the mitochondria relate to its function?

7. As a biker pumps up a hill to the finish line his leg muscles begin to feel fatigue. Describe the processes at work to make him feel this way.

8. How does aerobic respiration differ from anaerobic metabolism in terms of the reactants and the products?

© BrainMass Inc. brainmass.com October 24, 2018, 6:19 pm ad1c9bdddf


Solution Preview

Hi I've written the questions out again. I've added quite a lot of explanation. You'll need far less than this to get your one mark!

1. Describe the difference between exergonic and endergonic reactions:

The key to this one is the latin! gonic means energy and exer means gives out whilst endermeans takes in. Therefore an exergonic reaction releases energy whilst an endogonic one requires energy to be added. You may well have drawn graphs showing this.

2. Why do environmentalists claim that an increase in forests, i.e. rainforests, will slow down the effects of global warming?

Global warming is caused by the release of greenhouse gases. These trap the sun's heat warming the earth (just like a greenhouse). A major greenhouse gas is carbon dioxide- from burning fossil fuels. Plants use carbon dioxide in photosynthesis, so planting forests will reduce the quantity of carbon dioxide in the atmosphere and therefore decrease the warming of the earth.

3. Explain how fats and proteins may be utilised as fuels in the cell.

OK - I could give a huge and detailed answer to this, but for 1 point I'm guessing you want something not too complicated. Fats undergo glycolysis and enter the Krebs cycle. I don't know how much detail you've gone into but the advantage of using fats for respiration is that they release a large number of hydrogen ions. These can be used to produce ATP, and so fats produce more than double the energy of the same quantity of carbohydrate.

Proteins are only used in cases of starvation. The amino ...

See Also This Related BrainMass Solution

The Sun, its evolution as a star, and its presence in its life cycle

I have been waiting for any form of assistance for days now. I have revised the deadline for two days with no avail. My clock is running out & I have nothing but more confusion from trying to research extensively on the internet. Is there anyone who can help me? My paper is due in a few hours and I am really struggling with the Sun and its life cycle presence. I do not understand how the answer can be the same if the Sun is constantly rotating or being rotated by the Earth/Moon.

The Sun is a star. Briefly outline the evolution of a star and where the Sun is in its life cycle.

My confusion is does the question expect a response to the Sun's current existence in its life cycle or in general. Wouldn't it's current place in its life cycle depend on when I write the answer as it continually orbits the Earth? Also, if the Sun is a Star, then I must not understand the correct definition of a star because I thought the Sun and Moon orbited the earth and although not planets, I wasn't aware they were stars either.

Any thoughts or direction to assist on this question? I have to write a 300 word paper discussing the topic. Any external references for additional research would be appreciated as well.

View Full Posting Details