One strand of a DNA molecule has the base sequence TGGCAT. The complementary base sequence on the other strand of DNA will be _____. Selected Answer: ACCGTA
a) ATAGGT
b) ACCGTA
c) UCCGUA
D) TGGCAT
Answer: b) ACCGTA
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Hydroponic culture is the process of
a. growing plants in pure water mixed with carefully measured amounts of specific minerals. b. irrigation of dry areas to improve mineral absorption by plants. c. growing plants in ponds and lakes to improve their access to water, allowing the plants to place more resources into the shoot system. d. irrigation of dry areas to prevent crop plants from wilting. e. growing plants with specific hydrocarbons added to the soil to test the effect on plant growth.
Heterozygotes for the sickle-cell allele show higher fitness than either homozygote genotype in malarial regions. This is an example of
A) epistasis. B) pleiotropy. C) founder effect. D) overdominance. E) codominance.
One day after a biology class four of your friends argue about the difference between phylogeny and systematics. Which friend is right?
A. Friend A states that systematics and phylogenies are really the same, one is more recent than the other, but basically they are the same. B. Friend B says that systematics is the same as cladistics and cladistics is reconstructing clades, which ultimately lead to the development of phylogenies. C. Friend D says that the way she remembers is that systematics is the reconstruction and study of phylogenies. D. Friend C argues that systematics is the actual collecting and cataloguing of specimens into museums that can be used later by scientists to construct clades and phylogenies.
Human viruses that have appeared suddenly or have only recently come to the attention of medical scientists are called _____________.
A. retroviruses B. bacteriophages C. emerging viruses D. viroids