Which of the following statements about deuterostomes is true?
A) Deuterostomes lack true tissues.
B) Deuterostomes have only two tissue layers.
C) The opening that forms during deuterostome gastrulation becomes the anus.
D) The opening that forms during deuterostome gastrulation becomes the mouth.
Answer: C
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In a partially diploid F? exconjugant, there are two alleles for lac (1 and 2 ) and two alleles for his (3 and 4). The phenotype of this cell is identical to a lac 1 his 4 cell. What is the best interpretation?
A) Lac 1 and 2 and his 3 and 4 share only lac 1 and his 4 phenotypes. B) Lac 1 complements lac 2 and his 3 complements his 4. C) Lac 1 and his 4 are dominant. D) Lac 1 and his 4 are wild types. E) Lac 1 shows its phenotype only if his 4 is also present.
Lenticels function to:
a. protect undeveloped embryonic shoots. b. permit gas exchange through the periderm. c. support leaves and flowers. d. absorb water and dissolved nutrient minerals. e. anchor a plant in the ground.
A(n) ____ has both biotic and abiotic components
a. population b. community c. ecosystem d. species e. genus
The loss of water from the surface of plants is
A. transpiration. B. dew. C. biomagnification. D. bioaccumulation.