A fundamental concept of biology that states that all living things are composed of cells is the

a

cell theory

b

theory of evolution

c

theory of biogenesis

d

scientific method

Bacteria are grouped into two catgories reflecting structural features of their cells. Bacteria are classified as Gram-positive or Gram-negative based on whether or not they retain the crystal violet dye used in the Gram stain procedure.

What are isoma and isotopes. what is the difference and similarity? What are their roles?

Light sensitivity in the euglena is provided by the eyespot. true or false?

Which statement best supports the hypothesis that glycolysis is an ancient metabolic pathway that originated before the last universal common ancestor of life on Earth? a. Glycolysis neither uses nor requires O₂. b.

Which one of the following does not accurately describe microtubules? A) composed of long chains of the protein tubulin B) largest diameter of the three components of the cytoskeleton C) associated with organelle movement and cell motility D)

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.