Rickettsias differ from chlamydias in that rickettsias A) Are gram-negative. B) Are intracellular parasites. C) Require an arthropod for transmission. D) Form elementary bodies. E) Lack cell walls.

During the signal transduction process, the signal often triggers a signal transduction cascade. For example, a single activated protein A molecule activates hundreds of protein B molecules, and so on, until a cellular response occurs.

Which describes the average number of children a woman has in her lifetime? O A. Carrying capacity O B. Birthrate O C. Fertility rate O D. Death rate

Which of the following choices lists the correct order of flow of information according to the central dogma? a. DNA - --> mRNA - --> Protein b. RNA - -->DNA - --> Protein c. DNA - --> Protein - --> mRNA d. Protein - -->DNA - --> RNA

1. the high energy chemical compound with three phosphate groups that provides energy for all other cell activities endocytosis 2.

which of the following organic molecules is a major storage carbohydrates used to store energy in plants

What type of bond links monomers together to form polymers? using the analogy of a train, if cars represent amino acids, what does the entire train represent?

Differences among individuals of a species are referred to as

J. What differences can you see when you compare the nucleus of a dividing cell with that of a non-dividing cell?

What is the energy of a photon first used to do in photosynthesis?

Select the correct statement regarding chemical synapses. A) Cells with gap junctions use chemical synapses. B) The release of neurotransmitter molecules gives cells the property of being electrically coupled.