An allele that appears more frequently in males is most likely
a. dominant.
b. nonhomologous.
c. homologous
d. sex-linked
d. sex-linked.
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According to the endosymbiosis theory of the origin of eukaryotic cells, how did mitochondria originate?
A) from infoldings of the plasma membrane, coupled with mutations of genes for proteins in energy-transfer reactions B) from engulfed, originally free-living proteobacteria C) by secondary endosymbiosis D) from the nuclear envelope folding outward and forming mitochondrial membranes
An energy pyramid illustrates ____
a. the first law of thermodynamics b. the diminishing of usable energy as it is transferred through an ecosystem c. that energy can be recycled d. the biological magnification of materials in an ecosystem e. the diminishing number of organisms at each trophic level
When MSH2 and MLH1 are inactivated by mutation, DNA repair is defective and ____________________ mutation
rates increase by at least 100-fold. Fill in the blank(s) with the appropriate word(s).
What is the name for the type of hormone, secreted by the pituitary that regulates other endocrine organs?
A) tropins B) somatostatins C) somatotropins D) growth hormones