Although symbiotic relationships between nitrogen-fixing bacteria and plants are rare, many plants have symbiotic relationships with
A. soil insects.
B. nematode worms in the soil.
C. other plants.
D. filamentous algae.
E. mycorrhizal fungi in the soil.
Answer: E
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The perianth of a flower consists of:
A. the pistil and stamens B. the petals and sepals C. the peduncle and receptacle D. the anthers and stigma E. the style and ovary
During ________ DNA fragments are separated based upon ________
a. DNA sequencing, color b. electrophoresis, color c. electrophoresis, size d. polymerase chain reaction, size e. genetic analysis, size
Blood is prevented from back flowing in veins
because of
a. high pressure flow. b. rapid diffusion. c. one-way valves. d. suction from the lungs. e. the pulsing of the veins.
Since mice embryos with loss-of-function Hox mutations result in homeotic alterations, then introduction of such a mutation might cause __________
A) ribs on normally rib-less vertebrae B) pointed rather than rounded ears C) a change in fur coloration along the dorsal midline D) behavioral alterations causing limb shaking E) paralysis of hindlimbs but not forelimbs