Albert von Kölliker was the first researcher to isolate mitochondria, which are A) the structures in the center of cells that contain the DNA that governs all aspects of the cell's structure and function. B) the structures within cells that generate energy for fueling cellular processes. C) foreign proteins that cause the immune system to create an antibody. D) nutrient-rich materials that provide cells everything they need to grow.

The correct answer is B

Explanation:

Mitochondria are membrane-bound cellular organelles that are found in eukaryotic plant and animal cells that produce high energy compounds (called ATP) that are responsible for cellular activities.

NOTE: ATP (adenosine triphosphate) is described as the unit for energy in biology, hence the answer is B

a adaptation is when organism changes itself to fit the environment

ex. when its cold outside i wear a jacket

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step 1: initiation

initiation is the beginning of transcription. it occurs when the enzyme rna polymerase binds to a region of a gene called the promoter. this signals the dna to unwind so the enzyme can ‘‘read’’ the bases in one of the dna strands. the enzyme is now ready to make a strand of mrna with a complementary sequence of bases.

step 2: elongation

elongation is the addition of nucleotides to the mrna strand. rna polymerase reads the unwound dna strand and builds the mrna molecule, using complementary base pairs. there is a brief time during this process when the newly formed rna is bound to the unwound dna. during this process, an adenine (a) in the dna binds to an uracil (u) in the rna.

step 3: termination

termination is the ending of transcription, and occurs when rna polymerase crosses a stop (termination) sequence in the gene. the mrna strand is complete, and it detaches from dna.