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Please Help with Homework (fairly easy questions)

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Please Help with Homework (fairly easy questions)

Postby WishIknewbio » Wed Feb 15, 2012 6:02 pm

Many can provide answers so I can compare :D

1. Which of the following structures in not found in all types of cells?
A) cytoplasm
B) ribosomes
C) a nucleus
D) a plasma membrane

2. The boundary structure that physically defines a cell is the
A) plasma membrane.
B) protein channel.
C) hydrophilic layer.
D) phospholipid side chain.

3. Ribosomes are tiny “machines” in the cell that produce
A) proteins.
B) DNA.
C) membranes.
D) organelles.

4. Which of the following statements is false?
A) The plasma membrane prevents some molecules from entering the cell.
B) The plasma membrane prevents some molecules from leaving the cell.
C) The plasma membrane receives signals from the outside environment.
D) The plasma membrane is the storehouse for each cell’s genetic information.

5. What components of the plasma membrane of an animal cell would you find at its innermost surface, directly exposed to the cytoplasm?
A) phospholipid tails only
B) proteins only
C) phospholipid heads and proteins
D) phospholipid heads and nucleic acids

6. A screen door allows breezes to get in and aromas to get out but keeps out insects. Its function most resembles
A) the cytosol.
B) the plasma membrane.
C) the ER lumen.
D) a ribosome.

7. You are looking at a cell under a microscope and trying to determine whether it is a prokaryote or a eukaryote. You know it is a eukaryote if you see
A) DNA.
B) a plasma membrane.
C) a nucleus.
D) a cell wall.

8. Which of the following statements is true?
A) All types of eukaryotic cells have the same structure, appearance, and function.
B) Different eukaryotic cells contain different numbers and types of organelles depending on the specific tasks they must perform.
C) Bacterial cells contain membrane-bound organelles.
D) Plant and animal cells have the same structure and organelles.

9. A cell you view under a microscope has a cell wall and chromosomes but no nucleus. The cell you are viewing could be a(n)
A) human muscle cell.
B) cell from a maple leaf.
C) prokaryote in a human intestine.
D) cell in a potato skin.

10. The boundary that surrounds the contents of the nucleus is the
A) plasma membrane.
B) nuclear envelope.
C) nuclear pore.
D) cytosol.

11. The smooth endoplasmic reticulum
A) is the site for manufacture of lipids destined for other cellular compartments.
B) produces the energy needed to run chemical reactions in the cell.
C) converts sunlight into chemical energy.
D) stores water, nutrients, and enzymes.

12. The Golgi apparatus
A) is the place where a cell’s genetic material is stored.
B) sorts proteins and lipids and sends them to their final destination.
C) captures energy from sunlight and sends it to mitochondria.
D) creates energy by converting ribosomes to proteins.

13. Which of the following is not a function of the plant vacuole?
A) storage of ions, pigments, and toxins
B) production of ATP
C) breakdown of macromolecules with enzymes
D) support of overall plant structure

14. Using an electron microscope, you notice an organelle that consists of stacks of membranes and appears to be producing vesicles. This organelle is most likely
A) ribosomes.
B) the nucleus.
C) a mitochondrion.
D) a Golgi apparatus.

15. Which of the following statements is true of chloroplasts?
A) They produce proteins used by other parts of the cell.
B) They capture energy from sunlight.
C) They give an animal cell its shape.
D) They contain an entire copy of a cell’s genetic material.

16. Your muscle cells need large amounts of ATP to function in the movement of your body. Which of the following organelles would you expect to be especially abundant in muscle cells?
A) mitochondria
B) ribosomes
C) smooth endoplasmic reticulum
D) lysosomes

17. Which of the following works like a propeller?
A) eukaryotic flagella
B) prokaryotic flagella
C) eukaryotic cilia
D) prokaryotic cilia
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Postby billyfisher100 » Wed Feb 15, 2012 6:46 pm

1. Which of the following structures in not found in all types of cells?
A) cytoplasm
B) ribosomes
C) a nucleus
D) a plasma membrane

C)

2. The boundary structure that physically defines a cell is the
A) plasma membrane.
B) protein channel.
C) hydrophilic layer.
D) phospholipid side chain.

A)

3. Ribosomes are tiny “machines” in the cell that produce
A) proteins.
B) DNA.
C) membranes.
D) organelles.

A)

4. Which of the following statements is false?
A) The plasma membrane prevents some molecules from entering the cell.
B) The plasma membrane prevents some molecules from leaving the cell.
C) The plasma membrane receives signals from the outside environment.
D) The plasma membrane is the storehouse for each cell’s genetic information.

D)

5. What components of the plasma membrane of an animal cell would you find at its innermost surface, directly exposed to the cytoplasm?
A) phospholipid tails only
B) proteins only
C) phospholipid heads and proteins
D) phospholipid heads and nucleic acids

A)

6. A screen door allows breezes to get in and aromas to get out but keeps out insects. Its function most resembles
A) the cytosol.
B) the plasma membrane.
C) the ER lumen.
D) a ribosome.

B)

7. You are looking at a cell under a microscope and trying to determine whether it is a prokaryote or a eukaryote. You know it is a eukaryote if you see
A) DNA.
B) a plasma membrane.
C) a nucleus.
D) a cell wall.

C)

8. Which of the following statements is true?
A) All types of eukaryotic cells have the same structure, appearance, and function.
B) Different eukaryotic cells contain different numbers and types of organelles depending on the specific tasks they must perform.
C) Bacterial cells contain membrane-bound organelles.
D) Plant and animal cells have the same structure and organelles.

B)

9. A cell you view under a microscope has a cell wall and chromosomes but no nucleus. The cell you are viewing could be a(n)
A) human muscle cell.
B) cell from a maple leaf.
C) prokaryote in a human intestine.
D) cell in a potato skin.

C)

10. The boundary that surrounds the contents of the nucleus is the
A) plasma membrane.
B) nuclear envelope.
C) nuclear pore.
D) cytosol.

B)

11. The smooth endoplasmic reticulum
A) is the site for manufacture of lipids destined for other cellular compartments.
B) produces the energy needed to run chemical reactions in the cell.
C) converts sunlight into chemical energy.
D) stores water, nutrients, and enzymes.

A)

12. The Golgi apparatus
A) is the place where a cell’s genetic material is stored.
B) sorts proteins and lipids and sends them to their final destination.
C) captures energy from sunlight and sends it to mitochondria.
D) creates energy by converting ribosomes to proteins.

B)

13. Which of the following is not a function of the plant vacuole?
A) storage of ions, pigments, and toxins
B) production of ATP
C) breakdown of macromolecules with enzymes
D) support of overall plant structure

B)

14. Using an electron microscope, you notice an organelle that consists of stacks of membranes and appears to be producing vesicles. This organelle is most likely
A) ribosomes.
B) the nucleus.
C) a mitochondrion.
D) a Golgi apparatus.

D)

15. Which of the following statements is true of chloroplasts?
A) They produce proteins used by other parts of the cell.
B) They capture energy from sunlight.
C) They give an animal cell its shape.
D) They contain an entire copy of a cell’s genetic material.

B)

16. Your muscle cells need large amounts of ATP to function in the movement of your body. Which of the following organelles would you expect to be especially abundant in muscle cells?
A) mitochondria
B) ribosomes
C) smooth endoplasmic reticulum
D) lysosomes

A)

17. Which of the following works like a propeller?
A) eukaryotic flagella
B) prokaryotic flagella
C) eukaryotic cilia
D) prokaryotic cilia

B)
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Postby billyfisher100 » Wed Feb 15, 2012 6:48 pm

Sorry - 5 B), not 5 A)
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Re:

Postby Squirrell » Thu Feb 16, 2012 8:59 pm

billyfisher100 wrote:Sorry - 5 B), not 5 A)


Although homework is not to be assisted on these forums, the answer is C, not A or B. The polar heads of the phospholipids as well as integral proteins (hydrophilic channels, peripheral proteins etc) are exposed to cytoplasm/tissue fluid. See fluid mosaic model; http://www.infoplease.com/images/cig/bi ... 2fig01.png
"Every cell is a triumph of natural selection." Carl Sagan
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Postby WishIknewbio » Thu Feb 16, 2012 9:11 pm

sorry but thatnks for the help if you would like to know I got a 100% that's incluing using @squirell's answer for #5 thanx I was amazed
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Re:

Postby Squirrell » Thu Feb 16, 2012 9:52 pm

WishIknewbio wrote:sorry but thatnks for the help if you would like to know I got a 100% that's incluing using @squirell's answer for #5 thanx I was amazed


Well done. :)
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Postby billyfisher100 » Mon Apr 30, 2012 4:26 pm

Sorry, squirrel, you're absolutely right - I wasn't visualising that correctly.
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