Critical Thinking When a spherical cell increases in diameter from 2 um to 20 um, by what factor does its surface area change? By what factor does its volume change? (The surface area of a sphere
= 4n radius, and the volume of a sphere = 4/37 radius”. Remember that diameter = 2 x radius.)

Which of the following protists gets nutrients mainly by absorbing molecules from other organisms through their cell walls and cell membranes? a. amoebas b. water molds c. ciliates d. slime molds

Across of blue x blue (both heterozygous) would result in

One of the newest applications of cell technology is called cybrid embryos. this process involves replacing the nuclear material of an animal cell with human nuclear material. how might this process affect public policies about research by using stem cells? the same policies and concerns about the use of human embryonic stem cells would most likely apply. the embryos would most likely be treated like traditional animal embryos and regulated accordingly. the process of forming cybrid embryos would most likely be banned by government regulators. the embryos would be treated as regular cells because they are not fully human in origin.