The "big bang" that produced the universe is thought to have occurred
A) 40 to 50 billion years ago.
B) 12 to 14 billion years ago.
C) 4.6 billion years ago.
D) 4 million years ago.
Answer: B
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Among the actions listed below, which are involved in PCR, and in what order? Extension Initiation Denaturation Termination Annealing
A. Initiation, extension, termination B. Denaturation, annealing, extension C. Denaturation, extension, termination D. Initiation, denaturation, extension E. Annealing, initiation, termination
Cell extension involves
A. loss of water. B. low acidic condition. C. enzymes that produce polysaccharides. D. expansion of cellulose microfibrils. E. water leaving the central vacuole.
Which of the following pairs shares a similar function?
A) adhesive junction–tight junction B) desmotubule–gap junction C) tight junction–gap junction D) plaque–plasmodesma E) connexon–desmosome
How is cytokinesis different in plant and animal cells?
a. It forms a cleavage furrow in animal cells, and a cell plate in plant cells. b. It helps create four daughter cells in animal cells, and two in plant cells. c. It forms a cleavage furrow in plant cells, and a cell plate in animal cells. d. It helps create two daughter cells in animal cells, and four in plant cells.