Maternal effect mutations can be identified when
A) homozygous mutant females exhibit an abnormal phenotype, whereas mutant males appear wild-type.
B) homozygous mutant females can develop normally, but their offspring exhibit a mutant phenotype.
C) heterozygous mutant females can develop normally, but their offspring exhibit a mutant phenotype.
D) any aspect of embryonic development is abnormal.
B) homozygous mutant females can develop normally, but their offspring exhibit a mutant phenotype.
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Each of the following is a characteristic of hormones except
A) synthesis by endocrine tissue cells. B) secretion directly into the bloodstream. C) having a hormone-specific lifespan in the blood ranging from seconds to hours. D) interacting with specific receptors on cells in target tissues throughout the body. E) All are characteristics of endocrine hormones.
Why don't the grafted hybrids produce apples with a blend of traits from the scion and the rootstock?
A) The rootstock suppresses activation of the scion genes, which alters fruit production. B) The rootstock is unable to perform photosynthesis and so can't produce fruit. C) Transplanted nuclei from scion cells regulate gene expression in the rootstock. D) The rootstock regulates gene expression in the scion but contributes no genetic information for fruit production.
What major characteristic distinguishes bacteria from protists?
What will be an ideal response?
Water is important to the interactions of biological molecules because it ____.
A. is a good buffer B. destabilizes temperature C. is a poor solvent for polar and ionic substances D. has weak cohesive properties E. promotes hydrophilic interactions