In C. elegans ced-9/ced-3 double mutants
A. 131 cells always die.
B. all 1090 cells die.
C. all 1090 cells live.
D. only 959 cells live.
C. all 1090 cells live.
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What is the current status of the Human Genome Project? What will be an ideal response?
Heterotrophs that obtain energy and carbon by feeding on both animal and plant materials are called ____.
A. detritivores B. herbivores C. carnivores D. omnivores E. decomposers
Which term describes an additional layer of skin that forms a sheath like covering over the glans of a penis?
A. urethra B. fourchette C. scrotum D. foreskin
Changes that have occurred in living organisms over the past four billion years are due primarily to
A. extinction of species. B. continental drift. C. changes in geological periods. D. interaction of genetic and environmental changes. E. the change in the orbit of the moon, causing mass extinction due to volcanic activity.