Archaeopteryx is a transitional form between
a. birds and mammals.
b. mammals and reptiles.
c. reptiles and birds.
d. fish and amphibians.
e. amphibians and reptiles
C
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The cytoplasmic membrane of Thermoplasma contains a lipopolysaccharide-like material called lipoglycan which
A) behaves like peptidoglycan and creates a strong cell wall. B) forms a monolayer that stabilizes the cytoplasmic membrane. C) contains ether linkages. D) contains ether linkages and forms a monolayer that stabilizes the cytoplasmic membrane.
Which letter indicates the direction of incoming light in a typical vertebrate?
Vision differs from the other senses in two interesting ways. Although most sensory receptor neurons are depolarized when the receive a stimulus, rod and cone cells become hyperpolarized when they receive light. When hyperpolarized, they stop releasing inhibitory neurotransmitter and allow the bipolar cells to fire. A second unusual aspect is that the vision circuit seems to be organized "backwards" -- the light must pass through the layers of ganglion and bipolar cells to reach the rods and cones.
A. A
B. B
C. C
D. D
E. All of the directions are possible.
What is the number of chromosomes in the parental cell?
a. 1 b. 2 c. 4 d. 8
Four of the five answers listed below are
events occurring during mitosis. Select the EXCEPTION.
a. crossing over b. division of centromeres c. chromosomes line up at the cellular equator d. attachment of spindle microtubules to centromeres e. migration of chromosomes to opposite ends of the cell