Frogs will spend a longer time as larvae if
a) they are far away from land
b) the water temputure is cool
c) enough food is available
d) the water temputure is hot

Molecules like glucose and amino acids are not lipid soluble, so cannot cross the cell membrane by simple diffusion. instead, they are shuttled across by carrier proteins in the membrane from high to low concentration. does this process require energy from the cell? this is an example of what type of molecular movement?

Color blindness is a recessive trait. the gene for color blindness is on the x-chromosome. the family tree below shows the trait of color blindness. theonly unknown is the father in the first generation.

Which ingredient(s) in macconkey agar supply(ies) a) carbon b) nitrogen a) lactose: fermentable carbohydrate providing carbon b) casein and animal tissue: provides nitrogen