Disease in which a person's immune system attacks a person's own cells is known as
A. immunodeficiency diseases.
B. autoimmune diseases.
C. allergic reactions.
D. rejection responses.
B. autoimmune diseases.
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As electrons are passed through the system of electron carriers associated with photosystem II, they lose energy. What happens to this energy?
A) It excites electrons of the reaction center of photosystem I. B) It is lost as heat. C) It is used to establish and maintain a proton gradient. D) It is used to phosphorylate NAD+ to NADPH, the molecule that accepts electrons from photosystem I.
The terms "run" and "tumble" are generally associated with
A) eukaryotic cells. B) nutrient transport. C) chemotaxis. D) clustering of certain rod-shaped bacteria.
Examination of a phenotype can always determine the genotype of an organism
__________________ Indicate whether the statement is true or false.
Heinz Fraenkel-Conrat induced point mutations in the genes encoding coat proteins of TMV and looked for changes in the resulting proteins
By examining the effect of single-base changes in the mRNA on the amino acid sequence, Conrat proved that __________. A) the genetic code is overlapping B) the genetic code is nonoverlapping C) the genetic code is redundant D) there are 20 amino acids E) the genetic code is triplet