Cells I

The _____ is the bacterial structure that acts as a selective barrier, allowing nutrients to enter the cell and wastes to leave the cell. 1. plasma membrane 2. nucleoid region 3. ribosome 4. pili 5. cell wall

1. plasma membrane The plasma membrane is selectively permeable. Bacterial DNA is found in the nucleoid region.

In a bacterium, where are proteins synthesized? 1. ribosomes 2. nucleus 3. peroxisome 4. nucleoid region 5. capsule

1. ribosomes Ribosomes are involved in the manufacture of polypeptides (proteins).

The structure that regulates the passage of material into and out of this bacterial cell is indicated by the letter _____. http://session.masteringbiology.com/problemAsset/1100503/4/2708q.jpg 1. A 2. B 3. C 4. D 5. E

3. C The plasma membrane is selectively permeable.

_____ are surface appendages that allow a bacterium to stick to a surface. 1. Ribosomes 2. Mitochondria 3. Fimbriae 4. Flagella 5. Cell walls

3. Fimbriae Fimbriae enable bacterial cells to stick to a surface.

What name is given to the rigid structure, found outside the plasma membrane, that surrounds and supports the bacterial cell? 1. capsule 2. pili 3. cell wall 4. flagella 5. nucleoid region

3. cell wall The cell wall is a rigid supporting structure.

The DNA-containing region of this bacterial cell is indicated by the letter _____. http://session.masteringbiology.com/problemAsset/1100503/4/2701q.jpg 1. A 2. B 3. C 4. D 5. E

4. D The nucleoid region contains DNA.

Where is a bacterial cell's DNA found? 1. ribosomes 2. nucleus 3. peroxisome 4. nucleoid region 5. capsule

4. nucleoid region Bacteria lack a nucleus; their DNA is found in the nucleoid region.

What is the function of a bacterium's capsule? 1. protein synthesis 2. DNA storage 3. propulsion 4. protection 5. adhesion

4. protection A bacterium's capsule has a protective role.

Mitochondria are found in _____. 1. animal cells only 2. plant cells only 3. all cells 4. animal cells and prokaryotic cells, but not plant cells 5. plant and animal cells

5. plant and animal cells All eukaryotic cells, including plant and animal cells, contain mitochondria.

Beginning within the nucleus, the first step leading to the synthesis of a polypeptide is _____. 1. translation of an RNA nucleotide sequence into a sequence of amino acids 2. linking of nucleotides to form a polypeptide 3. removal of introns from RNA and the stitching together of exons 4. translation of a DNA nucleotide sequence into a sequence of amino acids 5. transferring of information from DNA to messenger RNA

5. transferring of information from DNA to messenger RNA Transcription is the first of the two main steps of protein synthesis.

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