Which of the following statements about soil is false?
A. the O and A horizon has the greatest physical, chemical, and biological activity
B. the A horizon is the topsoil
C. the B horizon is the subsoil
D. the R horizon is bedrock or parent material
E. none of the above are false
E. none of the above are false
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Which of the following gymnosperms undergoes double fertilization?
A. angiosperms, not gymnosperms, demonstrate double fertilization B. cycads C. gnetophytes D. epiphytes E. ginkgos
The coefficient of relatedness of a human child to a sibling is, on average,
A. 0.25. B. 0.5. C. 0.75. D. 1. E. 1.5.
Bone-forming cells that secrete unmineralized bone matrix called osteoid. Osteoblasts are actively mitotic.
What will be an ideal response?
You created a worm that expresses a human Bcl-2 transgene, and you are crossing the transgene into a homozygous ced-9 mutant background. However, you inadvertently used a clone of Bcl-2 with a mutation in the BH domain, which is essential for function. What results do you expect for the ced-9 mutants with the mutant Bcl-2 transgene?
A. All 1090 cells will live. B. All 1090 cells will die. C. 131 cells will die. D. 959 cells will die.