Mammalian eyes sense light because the photoreceptor cells have molecules called opsins, which change structure when exposed to light. which of the following plant molecules would be analogous to mammalian opsins in their light-sensing ability?
a. pfr and phytochrome
b. cytokinins and phototropins
c. auxin and pfr
d. auxin and phytochrome

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lysosomes contain a variety of enzymes, enabling the cell to break down various biomolecules it engulfs, including peptides, nucleic acids, carbohydrates, and lipids (lysosomal lipase). the enzymes responsible for this hydrolysis require an acidic environment for optimal activity. hope i !

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands