Flashcards in Ch. 1 Deck (45)
All cells require oxygen to live.
In what way are all cells alike?
They store their genetic instructions in DNA.
How long ago is it estimated that the common ancestor for all of life existed?
Between 3.5 and 3.8 billion years ago
Genetic change followed by selection are the fundamentals of what process?
Which statement is NOT true about the differences between liver cells and kidney cells from the same animal?
The different cells have different DNA.
Which statement IS true about the differences between liver cells and kidney cells from the same animal?
- The different cells express different genes.
-he different cells have different roles in the body.
What is the cell theory?
All cells are formed by the division of preexisting cells.
Which of these structures cannot be resolved with a conventional light microscope?
Which of these structures CAN be resolved with a conventional light microscope?
An individual ribosome can be seen with a fluorescence microscope.
Individual atoms can be seen with an electron microscope.
.What do eukaryotic cells have that prokaryotes lack?
A nucleus and other internal organelles
.Which of the following are prokaryotes?
Archaea and bacteria
At a molecular level, the members of the two domains of prokaryotes–the archaea and bacteria–differ as much from each other as either does from the eukaryotes.
The DNA in the nucleus of eukaryotic cells is separated from the cytoplasm by the:
Which statement is NOT true of mitochondria?
Mitochondria are not present in plant cells.
Which statement IS true of mitochondria?
- Mitochondria have an inner and outer membrane.
-Mitochondria contain their own DNA.
- Mitochondria are thought to have originated from bacteria.
-Mitochondria generate chemical energy for the cell.
.Which statement is NOT true of chloroplasts?
Chloroplasts are present in essentially all eukaryotic cells.
.Which statement IS true of chloroplasts?
-Each has an internal stack of membranes and is enclosed by two membranes.
-Chloroplasts contain their own DNA.
-Chloroplasts are thought to have originated from bacteria.
-Chloroplasts produce food molecules and generate oxygen.
Which of the following organelles is an irregular maze of interconnected spaces enclosed by a membrane that functions as the site where most cell membrane components, as well as materials destined for export from the cell, are made?
The endoplasmic reticulum
Which of the following organelles is a stack of flattened membrane-enclosed sacs, functioning in receiving and often chemically modifying the molecules made in the endoplasmic reticulum, and then directing them to the exterior of the cell or to various locations inside the cell?
The Golgi apparatus
Which of the following organelles is a small, irregularly shaped organelle in which intracellular digestion occurs?
What mediates the exchange of materials between the endoplasmic reticulum, Golgi apparatus, the lysosomes, and the outside of the cell?
What is the name of the process by which eukaryotic cells engulf material captured from an external medium?
The largest single compartment in most cells is:
Which of these is NOT part of the cytoskeleton?
Which of these IS part of the cytoskeleton?
- Intermediate filaments
What role is NOT performed by the cytoskeleton?
Generating chemical energy
What role IS performed by the cytoskeleton?
- Pulling duplicated chromosomes to opposite poles in dividing cells
-Transporting organelles and molecules from one place to another in the cytoplasm
-Controlling cell shape and cell movement