Which of the following functions belongs to the cellular membrane? A. keeps the organelles in place

B. protects the cells from its surroundings

C. acts as an "ID card" for cells

D. allows large molecules to move from one side of a cell

I'm not really that good at biology, so please help...

How is ribosomal rna useful as a molecular clock? a. a large portion of the dna ring is not vital to structure or function, allowing it to accumulate neutral mutations. b. its rate of mutation increases over time as organisms continue to evolve and differentiate from each other. c. a slow mutation rate makes it useful for determining evolutionary relationships between ancient species. d. it is only found in select organisms, making it easier to compare relationships between species that have it.

The unique structure of the neuron is dedicated to the efficient and rapid transmission of neural signals. the relationship between neurons, the spinal cord, and the brain constitutes an elaborate communication system throughout the human body. all but one of the functions listed below are a result of this interaction.

What must be done to breed dogs for a partical trait