When (+) and (-) strains of the Zygomycete Rhizopus stolonifer meet, ________
a. they each release haploid spores which fuse to form a diploid mycelium
b. they cannot mate because they are incompatible strains
c. their hyphae fuse to form a diploid zygospore
d. they compete for available resources
c
You might also like to view...
Otto Loewi performed an experiment in which he electrically stimulated the vagus nerve connected to one frog heart and let the fluid bathing this first heart pass to a second chamber containing a second frog heart not connected to a nerve. What did Loewi observe?
A. There was no effect on the beating of either heart. B. The first heart showed an increase in beat rate, but there was no change in the second heart. C. The first heart showed an increase in beat rate and so did the second heart. D. The first heart showed a decrease in beat rate, but there was no change in the second heart. E. The first heart showed a decrease in beat rate and so did the second heart.
Which of the following is true about stem cells?
a. All stems cells can develop into any other type of cell. b. Stem cells are unspecialized cells. c. Stem cells are undifferentiated cells derived from embryonic cells. d. Stems cells undergo meiosis to repair damaged tissue.
Which of the following will tend to increase blood flow to skeletal muscle? (Select all that apply.)
a. A rise in muscle pH (more alkaline) b. A rise in muscle CO2 level c. A rise in plasma epinephrine d. Activation of the parasympathetic nervous system
All of the rickettsias are spread by transovarian transfer
Indicate whether the statement is true or false