What statement is in accordance with the keystone hypothesis?
A. Each species plays a small, but important role in the health of an ecosystem.
B. The fewer species present in an ecosystem, the more stable the community.
C. Only a few species contribute to the functioning of a particular ecosystem.
D. The role of each species within an ecosystem is highly unpredictable.
A. Each species plays a small, but important role in the health of an ecosystem.
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Predict which of the following DNA oligonucleotide probes would have the highest melting temperature (Tm) when hybridizing to the target sequence 5'-GTGCCTGAATGCAATGTCA-3'
a. 3'-CACGGA-5' b. 3'-CATGGA-5' c. 3'-TTACAG-5' d. 3'-TTACTG-5'
Mammals that have and care for only a few offspring are likely to exhibit a:
a. type I survivorship curve. b. type II survivorship curve. c. type III survivorship curve. d. type IV survivorship curve.
Sela, White, and Anfinsen's experiments on denatured ribonuclease showed that
a. protein denaturation is irreversible. b. proteins can renature to regain their activity only with the assistance of specialized enzymes. c. proteins can renature and regain their enzymatic activity. d. proteins can fold in a new structure that lacks enzyme activity.
A diploid germ cell will produce cells that have reduced the chromosome number by half, generating four haploid nuclei in
a)fertilization. b)mitosis. c)meiosis. d)replication. e)mutation.