How have classification systems for living things changed over the years?
A) Scientists have always recognized five kingdoms of living things, but the placement of species within those kingdoms has changed.
B) Until the last 20 years, organisms had been classified first as animal or plant. Recently, a five-kingdom system became the preferred classification system.
C) The three-domain system has been introduced within the last 30 years, to supplement the five-kingdom system.
D) The exact organization proposed in the eighteenth century by Carl Linnaeus has recently been reinstituted by scientists.
C
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Each weak acid has a characteristic pKa value defined as pKa = -logKa. What does the pKa tell you about the composition of the acid solution?
What will be an ideal response?
Which would be TRUE of comparing the DNA fingerprints from hair samples of identical twins?
A. Some bands match. B. No bands match. C. Every band matches. D. Exactly 50% of the bands match. E. Most bands match.
The cell type with the most mitochondria is
A) muscle. B) nerve. C) fat. D) sperm.
Organs form and begin to function during the ____ period
a. embryonic b. amniotic c. fetal d. chorionic e. gastrulation