The purpose of the synaptonemal complex is to
a. hold the homologous chromosomes tightly together.
b. support homologous chromosomes as they undergo recombination.
c. prevent chromosome fragments from floating free in the cytosol after DNA breakage for
recombination.
d. ensure that the process of crossing over is random.
e. hold the homologous chromosomes tightly together, support homologous chromosomes as
they undergo recombination, and prevent chromosome fragments from floating free in the
cytosol after DNA breakage for recombination.
E
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Why is the developmental sequence relatively similar across the animal kingdom?
a. Because most animals reproduce sexually b. Because most animals exhibit bilateral symmetry c. Because most animals have an internal body cavity d. Because most animals are considered coelomates
Mules are unusual hybrids because they
a. are weak. b. have a low survival rate. c. are robust. d. are sterile. e. produce sterile offspring.
A damaged red blood cell is removed from circulation by
A) phagocytosis by macrophages in the spleen. B) basophils releasing histamine to stimulate breakdown of RBCs. C) returning to red bone marrow and autolyzing. D) being actively transported into macrophages in the liver and spleen. E) endocytosis directed by monocytes.
A positively charged sodium ion
a. would get stuck in the hydrophobic core of the membrane. b. freely diffuses directly across the cell membrane. c. would require the use of integral protein channels to pass through a cell membrane.