The rejection of a transplanted kidney is due to a humoral immune response
Indicate whether the statement is true or false
FALSE
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The origin of the mitochondrion and chloroplast by endosymbiosis, hypothesizes that these organelles originated by
A. the fusion of two archean cells to form the eukaryote with the eukaryotic mitochondrion and chloroplast inside. B. the absorption of RNA from prokaryotic cells. C. prokaryotic cells being engulfed and becoming internal symbionts within an early eukaryotic cell. D. only the absorption of DNA from dead prokaryotic cells used as food. E. prokaryotic cells being engulfed and becoming external symbionts within an early bacteria cell.
Answer the following statements true (T) or false (F)
1. The membrane attack complex is involved in specific immune defense mechanisms. 2. The three major types of pathogens are bacteria, viruses, and cancer. 3. Helper T cells activate both B cells and cytotoxic T cells. 4. The first stage of a specific immune response is the activation of B cells and T cells. 5. Hypermutation refers to the process by which immunoglobulin gene domains recombine to form a diverse array of antibodies.
What are the branched extensions of a neuron that receive signals called?
A. axons B. cell bodies C. dendrites D. oligodendrocytes E. synapses
Alcoholic fermentation
A. produces carbon dioxide. B. All of the answer choices are correct. C. produces ethanol. D. is carried out by yeasts. E. produces far less ATP than aerobic respiration.