Where does the Calvin cycle occur?
a. thylakoid membrane
b. thylakoid lumen
c. stromal lamellae
d. cytosol
e. stroma
E
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The process of crossover is best defined as genetic recombination that occurs between ________.
a. non-sister homologous chromatids in meiotic prophase I b. sister chromatids in meiotic prophase II c. non-sister chromatids in meiotic prophase II d. sister chromatids in meiotic prophase I
The large, rigid layers of Earth's surface that are moving in response to forces deep within Earth, are called
A. petrifactions. B. Wallace's lines. C. radioisotopes. D. paleontologic units. E. tectonic plates.
The brains of Alzheimer disease patients display characteristic lesions called senile plaques formed by the accumulation of a protein fragment called amyloid beta-protein. How are the plaques believed to influence the progression of the disease?
1.Amyloid beta-protein accumulates inside cells, disrupting cell structure and function. 2.The plaques are present in brains of both normal elders and AD patients and differences between these groups in their number and rate of development are insignificant. 3.The plaques cause the degeneration and death of specific neurons, particularly in the limbic system. 4.The plaques cause the random degeneration and death of neurons throughout the brain.
The activities of macrophages
A. are part of the specific response against disease. B. are part of the nonspecific response against disease and stimulate phagocytic neutrophils. C. stimulate lymphocytes to carry on specific immunity. D. stimulate phagocytic neutrophils.