Which of the following traits do archaeans and bacteria share?
A) composition of the cell wall
B) composition of the cell wall and lack of a nuclear envelope
C) lack of a nuclear envelope and presence of plasma membrane
D) presence of plasma membrane and composition of the cell wall
C
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What is considered to be the primary method of succession in the marine intertidal zone?
A. facilitation. B. submission. C. logistic growth. D. facilitated growth. E. inhibition.
When food is abundant , the cellular slime mold secretes cAMP into the environment to signal the
formation of a multicellular slug-shaped colony. __________________ Indicate whether the statement is true or false.
If a restriction enzyme leaves a sticky end on a DNA fragment, it means the fragment:
A) will stick only to DNA from the same organism. B) can attach to any other sticky end produced by any other restriction enzyme. C) can transform bacteria without the need for a cloning vector. D) has a protruding end of a small number of unpaired bases.
During which stage of the cell cycle are chromosomes duplicated?
a. mitosis b. S phase c. interphase d. cytokinesis