Chapter Questions
All cells have these three things in common:a. cytoplasm, DNA, and organelles with membranesb. a plasma membrane, DNA, and a nucleusc. cytosol, DNA, and a plasma membraned. a cell wall, cytoplasm, and DNA
Which of the following is not a principle of the cell theory?a. Every cell arises from division of another cell.b. A cell is alive even as part of a multicelled body.c. Eukaryotic cells have a nucleus, and prokaryotic cells do not.d. The cell is the basic unit of life.
Unlike eukaryotic cells, prokaryotic cells _________ a. have no plasma membraneb. have RNA but not DNAc. have no nucleus
The surface-to-volume ratio ________a. does not apply to prokaryotic cellsb. is part of the cell theoryc. constrains cell size
Ribosomes are only found in eukaryotes.
True False
Cell membranes consist mainly of ______ and ________a. lipids; carbohydratesb. phospholipids; proteinsc. lipids; ECMd. phospholipids; ECM
Which of the following statements is correct?a. Some animal cells are prokaryotic.b. Only eukaryotic cells have mitochondria.c. The plasma membrane is the outermost boundary of all cells.
In a lipid bilayer, the _________ of all the lipid molecules are sandwiched between all of the ______a. hydrophilic tails; hydrophobic headsb. hydrophilic heads; hydrophilic tailsc. hydrophobic tails; hydrophilic headsd. hydrophobic heads; hydrophilic tails
The main function of the endomembrane system isa. building and modifying proteins and lipidsb. isolating DNA from toxic substancesc. secreting extracellular matrix onto the cell surfaced. producing ATP by aerobic respiration
What controls the passage of molecules into and out of the nucleus?a. endoplasmic reticulum, an extension of the nucleusb. nuclear pores, which consist of many proteinsc. dynamically assembled microtubulesd. tight junctions
Put the following structures in order according to the pathway of a secreted protein:a. plasma membraneb. Golgi bodyc. endoplasmic reticulumd. post-Golgi vesicles
No animal cell has a __________ a. plasma membraneb. flagellumc. lysosomed. cell wall
________ fasten animal cells to one another and to basement membrane.a. Plasmodesmatab. Adhering junctionsc. Tight junctionsd. Gap junctions
Which of the following organelles contains no DNA?a. nucleusb. Golgi bodyc. mitochondriond. chloroplast
Match each cell component with its main function.mitochondrionchloroplastribosomenucleuscell junctionflagellumcuticlea. connectionb. protects surfacesc. ATP productiond. protects DNAe. protein synthesisf. photosynthesisg. movement