The DNA of telomeres has been highly conserved throughout the evolution of eukaryotes. This most likely reflects _____
A) the low frequency of mutations occurring in this DNA
B) continued evolution of telomeres
C) that new mutations in telomeres have been advantageous
D) a critical function of telomeres
D
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Which of the following statements is true regarding the cells in a flower meristem? Select all correct choices
What will be an ideal response?
In a neuron at rest, the membrane is most permeable to
A. potassium. B. sodium. C. chloride. D. calcium. E. magnesium.
Which of the following statements about mammalian circulatory systems is false?
A) The pulmonary circuit carries blood between the heart and the lungs. B) The systemic circuit carries blood between the heart and the rest of the body. C) Mammals have two atria and two ventricles in their hearts. D) The left side of a mammal's heart sends blood to the lungs.
Peripheral proteins:
A) act as channels through which materials can pass. B) usually span the entire membrane. C) usually attach to integral proteins. D) have no known functions in membranes. E) are defective in cystic fibrosis.