Female fireflies identify males by their flashing patterns, which are often so complicated that signals sent by one
species cannot be understood by another species. This reproductive isolating mechanism is called ____.v
a. ecological isolation
b. gametic isolation
c. temporal isolation
d. behavioral isolation
e. mechanical isolation
ANSWER: d
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Explain our present understanding of molecular adaptations to the cytoplasmic membrane that are present in thermophiles
What will be an ideal response?
Erwin Chargaff showed that DNA that has 30% adenine has ________ thymine.
A) 20% B) 30% C) 60% D) 40%
Carbon dioxide enters the plant
a. at night in most plants. b. when transpiration stops. c. when the guard cells lose water and the stomata open. d. when potassium ions leave the guard cells. e. when the guard cells are stimulated by light.
Scientists are able to determine the location of cells expressing a certain gene in an embryo by:
a. the polymerase chain reaction. b. blastoderm fate mapping. c. gene mapping. d. immunofluorescence. e. multiple Southern blots.