Which motion of paricles across a membrane requires energy

Why do cells contain both macro molecules and small carbon compounds?

An immune system cell called the plasma cell produces thousands of antibodies (a type of protein) per second for release into the body. what type of intracellular structure would you expect to be very prominent within the cell?

Multigene families are Multigene families are groups of enhancers that control transcription. sets of genes that are coordinately controlled. usually clustered at the telomeres. equivalent to the operons of prokaryotes.

Why is Saturn not considered a terrestrial planet? A. It is giant and made of gas. B. It has a moon. C. It has a very small atmosphere. D. It is very dense.

Two brown-eyed parents have produced three blue-eyed sons. What can be concluded about the parents?

What list correctly shows carbohydrates in size from smallest to largest?

How do biotic factors affect the environment?

The part of the brain where planning, language and advanced thought occur is:the hippocampus. the amygdala. the cortex. the hypothalamus.

Which best explains the difference between a ball-and-stick model of a chemical compound and a space-filling model? Ball-and-stick models can show compounds in three dimensions, but space-filling models cannot.

Which of the following are not allowed on public land?