A cell is in metaphase if:
a. the chromosomes are visible as threadlike structures.
b. the nuclear envelope is clearly visible.
c. the chromosomes are aligned at the midplane of the cell.
d. the chromosome are separated into distinct groups at opposite poles of the cell.
e. cytokinesis is occurring.
C
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The nictitating membrane of sharks is used to:
a. protect the gills. b. line the mouth. c. enclose the internal organs. d. detect smells. e. cover the eye.
Which of the following NOT is an example of a respiratory surface?
a. amphibian skin b. human lungs c. fish gills d. ctenophore body surfaces e. fish scales
During SCNT, the DNA is extracted from the egg using a(n) _____
a. fine point needle b. virus c. micropipette d. electric current e. calcium phosphate
The biomass of a community is the weight of the
a. material decomposed in a year. b. producers. c. living organisms. d. consumers. e. decomposers.