Which sequence of events is correct for a specific immune response?
A. lymphocyte development, presentation of antigens, antibody production, challenge of B-cells
B. antibody production, lymphocyte production, B-cell challenge, presentation of antigens
C. lymphocyte development, presentation of antigens, B-cell challenge, antibody production
D. presentation of antigens, B-cell challenge, antibody production, lymphocyte development
E. lymphocyte development, challenge of B-cells, antibody production, presentation of antigens
Answer: C
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A(n) ________ carries a specific amino acid to a ribosome, where the amino acid bonds to another.
A) mtDNA B) rRNA C) mRNA D) tRNA
Which statement is true?
a. All animals with hearts have closed circulatory systems. b. Birds and crocodiles have pulmocutaneous circulation. c. All blood circulated through fish hearts is deoxygenated. d. Double circulation is a feature of all mammals and some birds.
Keeping internal conditions within tolerable
limits is called
a. maintenance. b. anatomy. c. physiology. d. homeostasis. e. equilibrium
In a major protein degradation pathway, a short polypeptide called _______ is attached to a protein to target it for destruction.
a. glutathione b. ubiquinone c. ubiquitin d. KDEL