Which of the following organisms have cells walls made of chitin?
A. Animals
B. Bacteria
C. Fungi
D. Plants
Ans: C. Fungi
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During which period did the coal forests form?
a. Cambrian b. Carboniferous c. Quaternary d. Jurassic e. Ordovician
Which of the following statements is NOT true of the
structures labeled “D” in the figure? a. They are sexual spores. b. They are haploid. c. They will germinate to produce a new mycelium. d. They will give rise to different mating strains of the fungus. e. They may fuse to produce a zygote.
Bacteria reproduce rapidly. It is possible for a few bacteria to grow in numbers sufficient to spoil milk left out overnight. The process by which bacteria reproduce is called ________
Fill in the blank(s) with correct word
Both excitatory and inhibitory neurons form junctions with muscles. By what mechanism do inhibitory neurotransmitters prevent the postsynaptic cell from firing an action potential?
(a) by closing Na+ channels (b) by preventing the secretion of excitatory neurotransmitters (c) by opening K+ channels (d) by opening Cl– channels