Aged RBCs are removed by _____ in the ____
Fill in the blank(s) with the appropriate word(s).
Answer: macrophages, spleen
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During anaphase I, which best represents segregation of the chromatids that make up one pair of homologues? (M represents a maternal chromatid and P represents a paternal chromatid. Assume no crossing over occurs.)
A. M and M to one pole; P and P to the other pole. B. M and P to one pole; M and P to the other pole. C. M to one pole; P to the other pole. D. half of M and half of P to each pole. E. the segregation of these chromatids is completely random.
Which of these is an example of hybridization?
a. breeding beagles and pugs to produce puggles b. breeding Hereford and Aberdeen Angus cattle to produce Black Baldy cattle c. breeding African Servals with domestic cats to produce Savannah cats d. breeding American Saddlebred and Arabian horses to produce National Show Horses
Genes located in cells in different regions of the
body during embryonic development may a. be turned on and off. b. never be turned on. c. be turned on and left on. d. be activated for only a short time in one cell and a long time in another cell. e. do all of these.
Carl Woese has controversially proposed that all three domains of life evolved from a(n) ________
A) single last unique common ancestor (LUCA) B) extremophilic archaean C) fusion of a bacterium with an archaean D) universal gene-exchange pool E) very large virus