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