Two different species of pine release their pollen at different times of the year. This is an example of
A) ecological isolation.
B) behavioral isolation.
C) mechanical incompatibility.
D) geographic isolation.
E) temporal isolation.
E
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Spoilage of bread, which appears dark green-blue to black in color, is MOST likely caused by the fungus
A) Aspergillus niger. B) Batrachochytrium dendrobatidis C) Glomus spp. D) Rhizopus stolonifer.
The above figure is of one of the most poisonous
mushrooms. Which of the following is true? a. It is a club fungus. b. It is called death cap. c. It is responsible for about 90% of all mushroom poisonings. d. It kills by causing liver and kidney failure. e. All of these are true.
B and T cells become activated and divide to produce identical cells when _____
a. activated by an antigen b. major histocompatibility genes are expressed c. activated by the presence of cancerous cells d. plasma cells begin to produce and secrete antibodies e. killer T cells bind to any pathogen
In cardiac and skeletal muscle vasculature, the distribution of alpha and beta receptors is such that epinephrine will
A) induce a dilation that increases blood flow to these tissues. B) increase skeletal muscle contractility. C) induce a constriction that decreases blood flow to these tissues. D) have no effect on peripheral resistance. E) increase myocardial contractility