The maternal genesof fruit flies:
A. are functionally dormant until fertilization.
B. are expressed in the unfertilized egg.
C. provide the proteins required for development until the cellular blastoderm forms.
D. All of the choices are correct.
D
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True or false: Post-zygotic reproductive isolation may be due to either temporal or ecological separation
A. true B. false
How does energy enter a food chain through primary producers?
A. The energy comes from detriivores. B. The energy enters through photosynthesis. C. Primary producers receive energy from secondary consumers. D. The energy is made available through heterotrophs. E. Primary producers can make the energy.
Skin cells, blood cells, and other cell types that are continually replaced arise from:
a. adult stem cells b. embryonic stem cells c. induced pluripotent stem cells d. differentiated cells of the same tissue type e. gamete cells
Four of the following statement about protocells are true. Which statement is false?
A. They are simple membrane-bound sacs. B. They contain DNA. C. They are able to engage in metabolism. D. They are able to reproduce. E. They are able to capture energy.