The process of aging is described by the term
a. senescence.
b. puberty.
c. neonate.
d. morulation.
e. fetalism.
A
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The movement of water through a membrane, from an area of high concentration to an area of low concentration, is known as
A) active transport. B) facilitated transport. C) passive transport. D) osmosis. E) photolysis.
Place the five steps of digestion in most animals with a digestive tube in the proper order
a. absorption ? enzymatic hydrolysis ? mechanical processing ? secretion of enzymes ? elimination b. absorption ? mechanical processing ? enzymatic hydrolysis ? secretion of enzymes ? elimination c. mechanical processing ? absorption ? secretion of enzymes ? enzymatic hydrolysis ? elimination d. mechanical processing ? secretion of enzymes ? enzymatic hydrolysis ? absorption ? elimination e. mechanical processing ? secretion of enzymes ? absorption ? enzymatic hydrolysis ? elimination
Scientists use mitochondrial DNA to track the migration of humans across the planet. After a group migrates away from their ancestral homeland, any mutations that occur are not mixed with those left in the ancestral population. Therefore, mitochondrial DNA samples taken from ____ would have the fewest unique mutations, representing the original and oldest DNA sequences.
A. Asia B. Australia C. Europe D. Africa E. the Americas
Which of the following statements most accurately describes transformation in bacteria?
A. Transformation is the creation of a strand of RNA from a DNA molecule. B. Transformation is the infection of cells by a phage DNA molecule. C. Transformation is the creation of a strand of DNA from an RNA molecule. D. Transformation is the assimilation of external DNA into a cell.