What Is Life? A Guide to Biology with Physiology
4th Edition
ISBN: 9781319065447
Author: Jay Phelan
Publisher: W. H. Freeman
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Chapter 4, Problem 6MC
Summary Introduction
Introduction:
The cytoskeleton is an internal scaffolding seen in cells.
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In which of the following ways does a bacterial cell differ from an animal cell? a. A bacterial cell is much larger than an animal cell. b. A bacterial cell has more mitochondria than an animal cell. c. A bacterial cell has RNA for its genetic material, whereas an animal cell does not. d. A bacterial cell does not have membrane-bound organelles, whereas an animal cell does.
Which of the folllowing organelles/complexes makes proteins?
A.
The Nucleus
B.
Cytoplasm
C.
Peroxisomes
D.
Ribosome
E.
Golgi Apparatus
Which of the following is a function performed by the cytoskeleton?a) provides structural support that determines cell shape and resists deforming forcesb) positions various organelles within the cell interiorc) provides a network of tracks over which materials like mRNA and organelles move within cellsd) serves as a force-generating apparatus that moves cells from one place to anothere) all of these choices
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What Is Life? A Guide to Biology with Physiology
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- I am confused as to why (d) or (e) are not correct. Is it not (d) because the inner surface of the vesicle becomes the extracellular component? And what about (e)? Is it because it's not between the organelles and the cytosol, but rather between the cytosol and the extracellular space?arrow_forwardThe cytoskeleton includesa. microtubules made of actin filaments.b. microfilaments made of tubulin.c. intermediate filaments made of staggered protein tetramers.d. smooth endoplasmic reticulum.arrow_forwardThe plasma membrane isa. a carbohydrate layer that surrounds groups of cells to protect them.b. a double lipid layer with proteins inserted in it, which surrounds every cell individually.c. a thin sheet of structural proteins that encloses cytoplasm.d. composed of proteins that form a protective barrier.arrow_forward
- Match each following organelle with its function: Select the INCORRECT match. a. Cytoskeleton/ Network of microtubulesand microfilaments b. RER/ Has sites for protein synthesis c. Nucleus/ Site of ribosome synthesis d. SER/ Contains enzymes for lipid synthesisarrow_forwardWhich of the following statements is correct? a. Ribosomes are only found in bacteria and archaea. b. Some animal cells are prokaryotic c. Only eukaryotic cells have mitochondria d. The plasma membrane is the outermost boundary of all cells. e. Some cell membranes do not consists of lipids.arrow_forwardWhich of the following is most likely to have the greatestconcentration of smooth endoplasmic reticulum?a. a cell that secretes enzymesb. a cell that destroys pathogensc. a cell that makes steroid hormonesd. a cell that engages in photosynthesisarrow_forward
- In animal cells, lysosomes are the organelles in charge of digesting enzymes withnutrients that the cell consumes. If all the lysosomes in a cell were to break, what wouldwould initially happen to the cell?A. Molecules within it would degrade.B. It would lose all the water in the cytoplasm.C. There would be no cellular respiration.D. No proteins would form.arrow_forwardCompared with a smaller cell, a larger cell of the sameshape has(A) less surface area.(B) less surface area per unit of volume.(C) the same surface-area-to-volume ratio.(D) a smaller cytoplasm-to-nucleus ratioarrow_forwardThe cytoskeleton of a cell consists of all of the following, excepta. microtubules.b. actin fi laments.c. extracellular matrix.d. intermediate fi laments.arrow_forward
- Which of the following is not a function of cytoskeleton in a cell ? A) Maintenance of cell shape and structure B) Intracellular transport C) Cell motility D) Support of the organellearrow_forwardWhich of the following cell organelles is absent in animal cells but present in a plant cell? a. Cell wall b.Cytoplasm c. Vacuoles d. Mitochondriaarrow_forwardWhich of these elements of the cytoskeleton is composed of tubulinand forms essential components of centrioles, spindle fibers, cilia,and flagella?a. actin filaments b. intermediate filaments c. microtubulesarrow_forward
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