Which of these can be described as the release of the oocyte from an ovary?
A) menstruation
B) ovulation
C) implantation
D) fertilization
B
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Countercurrent exchange is a mechanism in which two adjacent currents flow in opposite directions and exchange materials. This mechanism can be found in
A. mammals. B. birds. C. fish. D. worms. E. sea anemones.
The head of a sperm is covered by the ________, which contains enzymes that help penetrate the layers of cells surrounding the egg
Fill in the blank(s) with correct word
Scientists believe that stimulating growth of algae and other organisms can reduce carbon dioxide amounts in the atmosphere. Where is carbon dioxide consumed in a plant cell?
A. Number of amyloplasts B. Stroma in chloroplasts C. Matrix in mitochondria D. Central vacuole E. Cellulose in cell wall
Which of the following statements regarding antigens and antibodies is false?
A) An antibody usually recognizes and binds to an antigenic determinant. B) A single antigen may stimulate the immune system to make several distinct antibodies to it. C) Most antigens are proteins or large polysaccharides on the surfaces of viruses or foreign cells. D) Each antibody has only one antigen-binding site.