Many important cellular functions in eukaryotic cells occur within membrane-enclosed organelles, such as cellular respiration occurring within the mitochondria. The membranes of the mitochondria provide a place for enzymes needed for cellular respiration to anchor and function. Prokaryotic cells must also carry out respiration but do not have mitochondria. Where is the most likely place that enzymes needed for cellular respiration are anchored and functioning?
a. the cell wall
c. the cytosol
b. the chromosome
d. the plasma membrane
Answer: d. the plasma membrane
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What happens to plasma proteins in
capillaries?
a. they are forced into interstitial fluid by the blood pressure b. they diffuse passively into the interstitial fluid c. they remain in the capillaries and do not enter into the interstitial fluid d. they breakup into their components and the components diffuse into the interstitial fluid e. they are actively carried into the interstitial fluid
Secondary succession is likely to occur in
a. a burned forest. b. a shallow lake. c. an abandoned field. d. a burned forest and a shallow lake. e. a burned forest, a shallow lake, and an abandoned field
The first eukaryotic fossils are dated to about
a. 3.8 billion years ago. b. 2.1 billion years ago. c. 1.5 billion years ago. d. 750 million years ago. e. 201 million years ago.
In what way does prokaryotic fission resemble
eukaryotic mitosis? a. mechanism of chromosome movement b. genetically equivalent daughter cells are produced c. chromosome attachment d. production of a cytoskeletal framework for separating chromosomes e. all of these