Biology - February 2007

2007-02-05 13:35:03 · 3 answers · asked by whatsinaname07 1

2007-02-05 13:35:02 · 3 answers · asked by Anonymous 3

"What happens to contrast and resolving power when the aperture of the condenser of a compound light microscope is decreased?

2007-02-05 13:33:13 · 1 answers · asked by whatsinaname07 1

"In order, list the lenses in the light path between a specimen viewed with the compound light microscope and its image on the retina of the eye."

2007-02-05 13:31:17 · 2 answers · asked by whatsinaname07 1

In the space to the left, write the letter of description in red that best fits each term. You will not need to use all descriptions.


1. nucleus
2. chromosome

3. DNA

4. gene

5. cytoplasm
6. enzyme
7. photosynthesis

8. selectively permeable

A. takes place in the chloroplasts
B. a section of the DNA molecule that codes for a specific enzyme or other protein
C. allows some molecules to pass through but not others
D. the control centre of the cell
E. the molecule that contains the genetic instructions for the cell
F. applies pressure to the cell walls
G. consists of one DNA molecule and a variety of proteins
H. a protein that speeds up a chemical reaction
I. a material in which the nucleus and organelles are suspended

2007-02-05 13:16:51 · 5 answers · asked by ronni_macaroni 1

True or False. Re write the false statements making them true.

1. Animal cells do not have chloroplasts.

2. All organisms consist of many cells.

3. The cell wall controls the movement of materials into and out of the cell.

4. The chromosomes are found in the nucleus.

5. The green chloroplasts in a plant cell manufacture food for the cell.

6. Cellular respiration takes place in animal cells but not in plant cells.

7. In the mitochondria, energy is released from glucose molecules.

8. Most plant cells contain many small vacuoles.

9. The carbon dioxide that is a product of cellular respiration is used as a reactant in photosynthesis.

10. Both plant and animal cells are enclosed within a cell wall.

2007-02-05 13:14:50 · 5 answers · asked by ronni_macaroni 1

given an unknown substance, how do i determine ( describe) if it contained, starch, sugar, protein, or lipids?

thankyou

2007-02-05 13:10:10 · 1 answers · asked by abc 1

what is the purpose of substances like amylase, pepsin

2007-02-05 13:06:54 · 1 answers · asked by abc 1

Last question for the night =)

2007-02-05 13:05:55 · 3 answers · asked by skoolgirl 1

Just curious. I see people being shot generally near the chest and some gurgle some don't. Why do they gurgle blood and where are they shot?

2007-02-05 13:00:11 · 11 answers · asked by Anonymous

is true?

2007-02-05 12:59:50 · 1 answers · asked by dk 6

why do living organisms need the following substances: protein, carbohydrates, lipids.
thankyou

2007-02-05 12:56:54 · 2 answers · asked by abc 1

2007-02-05 12:53:38 · 3 answers · asked by rizwanjattala385 1

What is the most common extracellular ion?

2007-02-05 12:52:44 · 2 answers · asked by skoolgirl 1

2007-02-05 12:48:50 · 2 answers · asked by Tori T 1

2007-02-05 12:40:37 · 9 answers · asked by Cool24 1

2007-02-05 12:33:09 · 3 answers · asked by Tori T 1

Bears and humans walk on the soles of their feet. Most other large mammals walk on the front part of their feet. The rest of their foot looks like part of their leg. How many joints do bears and humans have within the long straight part of their leg?




How many joints do other mammals have within the long straight part of their leg??

2007-02-05 12:28:19 · 2 answers · asked by Anonymous

If the nucleotide or base sequence of the DNA strand used as a template for messenger RNA synthesis is ACGTT, then the sequence of bases in the corresponding mRNA would be??

Oh I really don't get this stuff...

2007-02-05 12:27:54 · 6 answers · asked by skoolgirl 1

2007-02-05 12:25:59 · 4 answers · asked by smashbrolover 1

2007-02-05 12:22:56 · 4 answers · asked by Anonymous

If you were an epidemiologist charged with controlling dengue fever, what important steps might you take? if you were a government employee charged with writing a tourist advisory statement on dengue fever for people travelling in the Carribean, what precautions would you advise tourists to take?

2007-02-05 12:19:28 · 3 answers · asked by thelmadc06 1

Lots of questions!
1. Why does the body need oxygen?
2. Describe how carbon dioxide from a cell in your hand leaves your body.
3. The lungs can expand and contract because they have muscular walls. Is this statment true or false? Explain.
4. What structures help increase the absorption of food in the small intestine? How do they do this?
5. How might your muscular system help you stay warm?
6. How might your circulatory system help you stay cool?
7. Why do humans need a complex circulatory system while an amoeba does not?
8. What can happen if arteries in humans become clogged or narrow?
9. What are the three main types of food? What does each type provide for your body?
10. How do smoke or pollutants in the air affect your respiratory system?
11. When people living in rural India emigrate to a city in Canada, they increase their risk of contracting colon cancer. Explain why.

2007-02-05 12:19:26 · 3 answers · asked by felix l 2

2007-02-05 12:19:26 · 4 answers · asked by :) 1

as in DNA

2007-02-05 12:18:47 · 2 answers · asked by Anonymous

like..why should human cloning be legal?
really need the source which you got it from..if you know any sites that specializes in human cloning..thatd be helpful too..:]

need it for a debate at school..lotses of thankses!! in advance..:]

2007-02-05 12:16:53 · 4 answers · asked by kishkabob 2

Any cel of the body can be affected by a mitochondrial cytopathy. Why, however, are the cells with the highest metabolic rates the most severely affected?

2007-02-05 12:15:26 · 3 answers · asked by chaunceyd06 1

Would the invasion of a cell by viruses increase, decrease, or have no effect on the osmolarity of a cell? Pls. Explain it!

2007-02-05 12:12:50 · 0 answers · asked by hi h 1

I would like to know if there are any ways I could Enhance my brain function to it full potentional.

2007-02-05 12:05:59 · 1 answers · asked by Caliente 1

2007-02-05 12:02:56 · 10 answers · asked by Anonymous