Centrosomes
a. are constricted regions of phase chromosomes.
b. determine the plane of cell division.
c. are the central region of the cell.
d. are the region where the membrane constricts during cytokinesis.
e. are part of cilia.
Ans: b. determine the plane of cell division.
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In mammals such as humans, the chorion and the allantois fuse to form the ____ , an organ that allows the embryo to obtain nutrients directly from the mother
Fill in the blank with the appropriate word.
A rapid, powerful movement of short duration that could not be sustained very long would likely involve mainly ____
a. fast anaerobic fibers b. fast aerobic and fast anaerobic muscle fibers c. slow muscle fibers and fast aerobic muscle fibers d. slow muscle fibers e. fast aerobic fibers
Areas that receive heavy rainfall tend to have ____ soils, and arid regions tend to have ____ soils
a. acidic; alkaline b. pH-neutral; acidic c. alkaline; acid d. acidic; pH-neutral e. pH-neutral; alkaline
When potassium ion channels open, which of
the following occurs?
a. potassium ions flow into the axon cytoplasm b. the axon cytoplasm becomes more positively charged c. sodium ions diffuse into the axon cytoplasm d. all of these occur e. none of these occur