Mendel concluded that each pea has two units for each character, and each gamete contains one unit. Mendel's unit is now referred to as a:
A: gene.
B: character.
C :trait.
D: genotype.
E: phenotype.
Answer: A: gene.
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Which of the following describes populations that are genetically isolated?
A. They do not share the same mutations. B. They do not live in the same areas. C. They do not exchange genetic information. D. They do not originate from the same population. E. They do not evolve.
Where is the double bond in oleic acid (between which carbons)?
a. between carbon atoms 18 and 19 b. between carbon atoms 20 and 21 c. between carbon atoms 24 and 26 d. between carbon atoms 26 and 28
According to the competitive exclusion principle, the populations of two species that live in the same place and have exactly the same ecological requirements
A) can coexist at the same carrying capacity (K) as when each population is separate. B) can coexist but with the population of each species at half of the carrying capacity (K) as when each population is separate. C) can coexist but with the population of one species much higher than that of the other species. D) cannot coexist because one species will eventually drive the other to extinction.
Which nutritional category do animals and most pathogenic bacteria fall into?
a. chemoheterotrophs b. chemoautotrophs c. photoautotrophs d. photoheterotrophs