The nuclear membrane functions as a
A) means of separating nuclear and cytoplasmic constituents.
B) means of localization of the chromosomes within the cell.
C) selective barrier, allowing certain substances in or out.
D) means of sequestering many of the mRNA processing activities from the cytosol.
E) all of the above
E) all of the above
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The first jawless fishes evolved by about ____ million years ago
a. 120 b. 270 c. 380 d. 480 e. 650
In all food chains, the flow of energy is unidirectional from the bottom to the top
Indicate whether the statement is true or false
Organelles such as mitochondria and chloroplasts are thought to have originated in eukaryotic cells via a process called
a. phagocytosis. b. endosymbiosis. c. endocytosis. d. autogenous formation.
Each of the following statements concerning bacterial spores is correct EXCEPT:
A. They are formed by Gram-positive rods B. Their survival ability is based on their enhanced metabolic activity C. They can be killed by being heated to 121 C for 15 min D. They contain much less water than bacterial cells