Which of the following have a cell wall?
A)Protoplasts
B) Fungi
C) L forms
D) Mycoplasmas
E) Animal cells
Ans: B) Fungi
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Arrange the following steps into the order that correctly represents the sequence for the evolution of cells:
1 . organic polymers 2 . DNA based cells 3 . inorganic molecules 4 . organic monomers 5 . protocells a. 5, 3, 1, 2, 4 b. 1, 4, 3, 2, 5 c. 1, 4, 3, 5, 2 d. 3, 1, 4, 5, 2 e. 3, 4, 1, 5, 2
An umbrella species is a
a) popular species that the public tends to rally behind and support b) non-native species, usually introduced to an area by accident c) species whose removal will severally damage or cause the collapse of its ecosystem d) species whose protection also results in the protection of many other species e) both the third and fourth answer choices are correct
During plant cell cytokinesis, what is the name of the structure that forms between the daughter cell nuclei and eventually will become the new cell wall?
A) Constriction ring B) Kinetochore C) Cell plate D) Vesicle wall
Activity of the neurotransmitter acetylcholine is brief because it
A) "self-destructs" shortly after leaving the presynaptic neuron. B) is transported back into the presynaptic neuron. C) diffuses out of the synaptic cleft. D) is pumped out of the synaptic cleft by the sodium-potassium pump. E) is rapidly broken down by enzymes in the synaptic cleft.