Xylem and phloem are types of
a. ground tissue.
b. protoderm.
c. vascular tissue.
d. meristem.
e. dermal tissue.
C
Biology & Microbiology
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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. contact-dependent signaling B. autocrine signaling C. direct intercellular signaling D. paracrine signaling E. endocrine signaling
Biology & Microbiology
These structures are held together by cohesin:
A. Homologous chromosomes B. Solenoids C. Sister chromatids D. Nucleosomes
Biology & Microbiology
Which animals are ectothermic?
A) frogs and mammals B) lizards and birds C) turtles and lizards D) birds and mammals
Biology & Microbiology
A weak acid may function as a
A) transfer group. B) buffer. C) hydroxyl donor. D) cation. E) salt.
Biology & Microbiology