Why do cells have plasma membrane?

A. To separate the inside of cell from its environment

B. To separate proteins from the nucleus

C. To define the size of cell

D. To distinguish plants from animals

The Occlusal refers to what part of the tooth? a. Surface of the tooth that faces away from the midline b. Surface of the tooth that face the tongue c. Chewing surface of all Posterior teeth d. Biting edge of all Anterior teeth

Cichlids are bony fish that are commonly found in the freshwater lakes of Africa, like Lake Victoria. There are more than 2000 recognized species of cichlids in these freshwater lakes.

Which statement about energy is true? A.) energy can't be created or destroyed. B.) Energy can't transform into different forms. C.) Organisms at the top of food chains have access to the most energy. D.

What is an example of a world crisis involving science?

Natural, opiate-like neurotransmitters linked to pain control are called

The pedigree chart below shows the individuals in a family who exhibit a certain trait. Based on the information in the chart, what conclusions can be drawn? A diagram of a pedigree chart.

If the allele frequency of the HbS allele is 0.3 in a population, what is the frequency of the HbA allele (assuming this is a two-allele system) ?

How do the nucleotides in dna pair?

Which of the following describes how the septum in the heart affects blood flow? a.) It pumps blood out of the heart to the rest of the cardiovascular system when heart muscles contract. b.

Ethanol is a fuel that can be made from corn. One of the benefits of using a biomass fuel like ethanol is A. It can only be used to power certain types of machines. B. It is a nonrenewable resource. C. It is a renewable resource. D.