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

Turtle hatchling survivorship rate is low in many turtle species due to predation. amanda researched the predatory rate on a species of turtle eggs in the red river. the eggs were harvested from trapped turtles and the egg's cloaca film (reproductive discharge) was either washed off or left on once gathered. research suggests that predators use the female's cloaca scent to locate the eggs. the eggs were only handled when wearing gloves and then reburied along islands where the turtles were trapped. the nests were monitored by cameras and manually on foot and data on nest predation were recorded. a. based on the experimental design, what is the dependent variable? b. based on the experimental design, what is the independent variable? c. based on the experimental design, what is the control?

Which best explains why there are 64 possible codons in the genetic code and only 20 amino acids that make protiens of living organisms on earth

What are the doorways into and out of cells, attached to the membrane, and built in the rough er.