Identify and briefly describe the function of the labeled structures on the sperm in the picture.
What will be an ideal response?
A. acrosome: covers the head of the sperm and contains enzymes that help the sperm penetrate the egg
B. head: contains the genetic material
C. middle piece: connects the head of the sperm to the tail; contains many mitochondria that produce ATP
D. tail: a flagellum with the 9+2 arrangement of microtubules
E. end piece: thin, short segment of the tail containing the axial bundle of fibrils
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Which of the following is a structure adapted for seed dispersal by animals?
a. light, feathery plumes b. thick, indigestible seed coats c. air spaces and cork d. turgor pressure within fruits e. winged fruits
Embryonic stem cells reach an intermediary level of determination at which they are committed to becoming a particular ______ type, but not necessarily a particular ____ type.
A. cell/tissue B. tissue/organ C. tissue/cell D. organ/tissue
Which type of junctions must there be between cells to form a barrier?
A. adhesion junctions B. free junctions C. gap junctions D. tight junctions E. channel junctions
Which of the following is false in respect to cells' chromosomes?
A. All cells possess one or more chromosomes. B. Chromosomes are present throughout a cell's reproductive cycle. C. Chromosomes only exist when cells are actively synthesizing proteins. D. Chromosomes only appear as a cell is about to divide. E. None of the listed responses is false.