In a set of classic experiments performed in the early 1950s, Urey and Miller subjected an experimental system composed of H2, CH4 (methane), and NH4 (ammonia) to electrical sparks. A few days later, they found ________________ in their system.
a. cells
b. rRNA
c. DNA
d. tRNA
e. amino acids
Ans: e. amino acids
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____ speciation is the gradual emergence of two or more species as a result of the geographic separation of two or more groups of animals of the same species
Fill in the blank with the appropriate word.
The diploid garden pea plant has 14 chromosomes. The haploid fungus Neurospora crassa has 7 chromosomes. Neither organism has separate male and female individuals. Therefore, the number of linkage groups in these two organisms is
A) the garden pea has 14 linkage groups, and Neurospora has 7. B) the garden pea has 7 linkage groups, and Neurospora has 7. C) the garden pea has 8 linkage groups, and Neurospora has 8. D) the garden pea has 15 linkage groups, and Neurospora has 8.
The brains of patients with Alzheimer’s disease have a reduced level of
1.serotonin. 2.dopamine. 3.acetylcholine. 4.aspartic acid. 5.GABA.
Whatever the motivation of self-sacrificing behavior
on the part of nonhuman animals is, we have no evidence that it is a. genetic. b. the result of selection. c. derived from conscious reasoning. d. a result of dominance hierarchy. e. related to species-survival strategies.