This structure serves to block more than one sperm from entering the fertilized egg
a. acrosome
b. yolk
c. amnion
d. fertilization membrane
e. mitochondria
D
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A ________ is a compound made by a particular type of cell
a. carbohydrate b. biomarker c. nucleic acid d. fatty acid e. protein
Which statement about the structure of neurons is true?
a. Dendrites carry impulses away from the cell body. b. Axons may form branches known as collaterals. c. Nerve impulses travel down the axon toward the cell body. d. Dendrites are often myelinated for faster conduction. e. Synapses occur between the cell body and its axon.
Cladists feel that a cladogram is a hypothesis about the evolutionary history of a group. Using what you have learned about scientific hypotheses, support this view of a cladogram.
What will be an ideal response?
If you look at the apoplast and the symplast, which of the following statements are true?
(a) The apoplast is always smaller than the symplast. (b) The apoplast is the continuum of cytosol connected by plasmodesmata. (c) The symplast does not allow exchange of material with the apoplast. (d) Plasmodosmata connect the cytosol from neighboring cells to form the symplast, but they do not connect to the apoplast. (e) In the symplastic route, water and solutes move along the continuum of cell walls and extracellular spaces.