You are examining a tissue sample under an electron microscope. You notice that the endoplasmic reticulum
(ER) of each cell in this
tissue is extremely rough
in
appearance and very extensive (occupies most of the
cytoplasm). You know that the rough appearance of ER is
because of the ribosomes embedded on the ER surface.
What is the most logical explanation for the extensive
rough ER and unusually high number of ribosomes
associated with it?

Based on the observation that only male crickets produce a song, you hypothesize that a male's song is a form of communication to potential mates. you set up a simple experiment to test this hypothesis. in the laboratory, you place a male snowy tree cricket in enclosure a, which is adjacent to enclosureb. in enclosure b, you place other insects, one at a time, and observe their responses to the male's song. the enclosures are designed so that the two insects being tested cannot see or smell each other, but sound is transmitted from enclosure a to enclosureb.