Most of the diversity of life on this planet comes from microbes
A. true
B. false
Answer: A
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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.
A(n) _____infection is an infection that produces no noticeable symptoms even though the microbe is active in the host tissue
Fill in the blank(s) with the appropriate word(s).
What is one type of cell that contains half the genetic information of an individual?
A) zygote B) gonad C) sperm D) fertilized egg
A pair of sex chromosomes found in a human male is most like
A) a pair of blue jeans. B) a bride and groom. C) a knife, fork, and spoon. D) identical twins.