Four of the five answers listed below are protistan structures. Select the exception
a. cell membrane
b. pili
c. mitochondrion
d. eyespot
e. pellicle
b
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The centromere
A. is a region of DNA where sister chromatids associate. B. is a group of proteins that attach to the kinetochore. C. is only present when chromosomes are highly compacted. D. is a group of proteins that attach to the mitotic spindle. E. is not present on the chromosomes of the daughter cells until anaphase.
After replication, chromosomes consist of how many molecules of DNA (assuming one chromatid is equal to one molecule of DNA)?
What will be an ideal response?
Besides Darwin, the theory of evolution by means of natural selection was also independently proposed by:
A. Thomas Malthus. B. Peter Raven. C. Alfred Wallace. D. Karl Popper. E. Charles Lyell.
All of the following are functions of the lymphatic system EXCEPT
A. production, maintenance, and distribution of lymphocytes. B. defending the body against pathogens. C. transporting gases, nutrients, and metabolic wastes to parts of the body which have exchange boundaries with the external environment. D. absorbing excess tissue fluids and returning them to the bloodstream.