Choose the option that places the following events in plant defense in the correct order:
1. Plant cell recognizes double-stranded RNA (dsRNA) as foreign and cleaves it into
fragments.
2. Single-stranded RNA (ssRNA) molecules bind to the protein-bound small interfering RNA
(siRNA) and are destroyed.
3. A virus infects the host plant, injecting ssRNA into the cell.
4. Viral genome is replicated and dsRNA molecules are formed.
5. siRNA bind to a plant protein complex, which retains only one of the RNA strands.
A. 3 2 1 4 5
B. 1 2 4 3 5
C. 5 3 4 2 1
D. 1 2 3 4 5
E. 3 4 1 5 2
E
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Horses and donkeys are closely related species that can interbreed. However, the offspring produced are usually sterile and cannot reproduce. What term would best describe the offspring from this mating?
A. alloploid B. euploid C. trisomic D. polyploid E. monosomic
Which statement about mycorrhizae is FALSE?
a. They are symbiotic associations between a fungus and a plant root. b. They increase the uptake of nutrient minerals by the plant.
c. Arbuscular mycorrhizae are extracellular. d. Endomycorrhizae are intracellular. e. Members of the Glomeromycota may be involved.
By the Late ____ period the Chordates had expanded to include a number of different taxa with skeletal elements such
as a rudimentary braincase. a. Permian b. Paleozoic c. Cambrian d. Jurassic e. Cretaceous
Flies from populations at fluctuating temperatures should have evolved the greatest capacity for acclimation.
a. true b. false