Two important contributions that cleavage makes to development are to
A) establish the basic tissues of the body and define the future nervous system.
B) create a multicellular embryo and partition the embryo into developmental regions.
C) create a multicellular embryo and establish the basic tissues of the body.
D) establish the basic body plan and determine the location of the mouth and anus.
Answer: B
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Prokaryotes were split into two domains based on differences in
a. staining characteristics. b. metabolic capabilities. c. rRNA sequences. d. cell membrane properties. e. cell wall composition.
Which of the following has been associated with Alzheimer's Disease?
A) loss of mitochondria B) 5kb and 7.4kb deletions in mtDNA of heart cells C) mutations in cytochrome oxidase c genes in brain cells D) no change in mitochondrial function.
At the end of DNA replication, the sister chromatids are held together by the ___________
(a) kinetochores. (b) securins. (c) cohesins. (d) histones.
An ineffective clonal deletion may lead to:
a. Allergic reactions b. Sepsis c. Autoimmunity d. All of the above