biology 1 >>chapter 4<<

Sperm cells move by means of _______. a. flagella b. cilia c. pseudopods d. actin filaments

a. flagella

Protein synthesis in bacterial cells is performed by _____. a. ribosomes b. centrioles c. flagella d. thylakoids

a. ribosomes

The endosymbiotic theory explains _____. a. the origin of chloroplasts and mitochondria b. how cells reproduce c. how photosynthesis occurs d. the differences between plant and animal cells

a. the origin of chloroplasts and mitochondria

What part does SRP (signal recognition protein) play in the binding of ribosomes to the endoplasmic reticulum? a. It binds to the mRNA first and then to the ER receptor which closes a channel. b. SRP binds first to the signal peptide on the polypeptide being synthesized and then to a receptor on the ER which opens a channel. c. It plays no real part in the binding of ribosomes to the ER. d. It signals the completion of the synthesis of ribosomal subunits and then binds to the ER

b. SRP binds first to the signal peptide on the polypeptide being synthesized and then to a receptor on the ER which opens a channel.

Debris that is trapped in mucus is moved away from the lungs toward the throat by _____. a. flagella b. cilia c. pseudopods d. actin filaments

b. cilia

Which of the following statements is false? a. Some cells are large enough to be seen by the naked eye. b. Cells with infoldings and outfoldings of their plasma membranes are able to move molecules across the membrane more efficiently than cells with no foldings. c. All cells are shaped like cubes or are round. d. In eukaryotic cells, the nucleus controls activities in the cell.

c. all cells are shaped like cubes or are round

The smallest living unit is a _____. a. proton b. molecule c. cell d. tissue

c. cell

Which of the following will NOT be found in abundance in an insulin-producing pancreas cell? a. Rough endoplasmic reticulum b. Golgi apparatus c. Chloroplasts d. Ribosomes

c. chloroplasts

The infoldings of the inner membranes of mitochondria provide an increase in surface area and are important in ATP production during cellular respiration. Name these structures. a. Stroma b. Thylakoids c. Cristae d. Matrix

c. cristae

Which of these organelles contain hydrolytic enzymes responsible for intracellular digestion? a. Mitochondria b. Ribosomes c. Lysosomes d. Golgi bodies

c. lysosomes

Synthesis of lipids occurs in which major organelle? a. Chloroplasts b. Mitochondria c. Smooth endoplasmic reticulum d. Rough endoplasmic reticulum

c. smooth endoplasmic reticulum

Eukaryotic cells are different from prokaryotic cells in which of the following ways? a. The presence of cytoplasm. b. The presence of a plasma membrane. c. The variety of organelles and their complexity. d. The presence of DNA.

c. the variety of organelles and their complexity

As cells increase in size, which of the following occurs? a. The volume and surface area will increase at the same rate. b. They will develop multiple nuclei. c. There will be a greater increase in volume than in the surface area of the cell. d. They will lose their nuclear membranes.

c. there will be a greater increase in volume than in the surface area of the cell

The outermost boundary of prokaryotic cells is their _____. a. plasma membrane b. nuclear envelope c. cytoplasm d. cell wall

d. cell wall

Large storage structures typically found in the center of plant cells are ______. a. plastids b. mitochondria c. Golgi bodies d. central vacuoles

d. central vacuoles

The stacks of membrane disks containing chlorophyll in a chloroplast are the ______. a. stroma b. plastids c. microfilaments d. grana

d. grana

The description "9+2 array" in cells refers to _______. a. microfilaments b. spindles c. vacuoles d. microtubules

d. microtubules

Skeletal muscle cells will have a large number of _____ due to their high demand for energy. a. chloroplasts b. lysosomes c. flagella d. mitochondria

d. mitochondria

A dark-staining, spherical body found in the nucleus that produces ribosomal subunits is a ______: a. plasma membrane b. smooth endoplasmic reticulum c. Golgi apparatus d. nucleolus

d. nucleolus

All cells contain the following structures except ______. a. ribosomes b. cytoplasm c. plasma membrane d. nucleus

d. nucleus