In Drosophila, the cells created by cleavage contain different developmental signals from the egg called cytoplasmic
A. determinants.
B. stem cells.
C. signals.
D. junctions.
Answer: A
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When a cell makes a cell membrane bound growth factor that binds to receptors on neighboring cells causing them to proliferate this is an example of _____.
A. endocrine signaling B. direct intercellular signaling C. contact-dependent signaling D. paracrine signaling E. autocrine signaling
Which of the following is NOT caused by the
positive feedback loop of ethylene action?
a. fruit ripening b. leaf abscission c. germination d. cell expansion e. all of these are caused by the positive feedback loop of ethylene action
Which of the following explains how fossils in South America and Africa are similar?
a. fossilization b. fossilization dating c. plate kinetics d. plate tectonics e. radiometric dating
Small circular RNAs called ________ are plant pathogens
A) plasmids B) viruses C) viroids D) prions E) phages