What replaces the membranes and nutrition source of amniotic eggs in organisms that exhibit live birth without amniotic eggs?
A) chorion B) allantois C) amnion D) yolk sac E) placenta
Answer: E
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Most chytrids eat
a. organic waste. b. are photosynthetic. c. strictly corn. d. muscle tissue. e. none of these.
Arbuscular mycorrhizae are characterized by all of the following features except
A. The fungus can associate with several species of plants. B. They are seen in the earliest vascular plant fossils. C. The fungal component is a glomeromycete. D. Fungal hyphae penetrate plant root cells. E. They are the most common mycorrhizal type.
How is a nerve impulse usually transmitted across a synapse from a presynaptic to a postsynaptic cell?
a) via a direct connection b) via Na+ ions c) via a neurotransmitter d) via a spark e) via plasmodesmata
What is the name of poisonous proteins produced and secreted by some bacterial cells?
A. endotoxins B. exotoxins C. endospores D. pathogens