What is left behind after a star with one more stellar masses has died

A memory B cell can differentiate upon reexposure to a pathogen of which cell type? CTL naïve B cell memory T cell plasma cell

What acts as a on and off switch for translation

What's the location of a granum

What is a alleles in biology?

To what organ system do the kidney belong

What evolutionary feature would distinguish phytoplankton from zooplankton?

What kind of organisms make up a food web

In this experiment, why didn't we just use ethanol to extract the trimyristin (instead of dichloromethane) ? this would have saved us a step and we would have been able to recrystallize directly after filtration.

How many different enzymes may be in the cytoplasm of a bacterium? How many copies of each enzyme are there?

All vertebrate embryos have slits and