One important aspect of self-incompatibility is to prevent:
A. expression of deleterious homozygous recessive genes
B. genes that may prevent pollen germination
C. factors that keep pollen from developing
D. matings between different species of plants
E. adherence of pollen to the stigma surface
A. expression of deleterious homozygous recessive genes
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The differentiation of embryonic stem cells into neurons and glial cells is a consequence of which type of cell signaling?
A. juxtacrine B. paracrine C. autocrine D. endocrine E. All of these choices are correct.
Fossil evidence indicates that the maker of stone tools found at Olduvai Gorge in Africa was probably ________
a. Homo habilis b. Homo erectus c. Homo sapiens d. Homo heidelbergensis
__________ superficially resemble bivalves
A. Brachiopods B. Rotifera C. Mollusca D. Bryozoa E. Chelicerata
Which information was determined about DNA based on X-ray diffraction data?
A) Each gene encodes one enzyme. B) DNA has a helical structure. C) There are four different bases on the nucleotides. D) Chromosomes are made of DNA. E) Point mutations change a single location in the genome.