Which of the following can be used by humans as an energy source?

a. chitin
b. amino acids
c. cellulose
d. RNA


b. amino acids

Biology & Microbiology

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Which of the following would most likely result in a bottleneck event, why?

A. A small population of geese migrates and joins a large nesting flock of the same species. This is a bottleneck event because the small population do not bring in any new alleles to the large flock. B. A mutation occurs in an individual poison ivy plant, doubling the number of seeds it produces. This is a bottleneck event because even though the mutation is passed down to the next generations, it does not change the frequency of any other alleles in the population. C. A hurricane blows through a coastal swamp, killing 98% of the snails in a population. This is only a bottleneck event if there is a change in the number of alleles in the population. The 2% of the snails remaining still have the same allele frequencies as the total population. D. A large population of broomsedge grass in a field is determined to be in Hardy-Weinberg equilibrium. This is a population bottleneck event because there is no random mating going on which increases the likelyhood that there will be a decrease in the number of alleles in the population. E. A small population of ducks with red beaks join a large population of ducks that have no red beaks. After 5 generations the number of ducks with red beaks is reaching 50% in the population. This is a bottleneck event because there is a decrease in the number of ducks without red beaks.

Biology & Microbiology

There are two forms of human earwax: wet and dry. W is a dominant allele that produces wet earwax. Individual 1 has dry ear wax and 2 has wet earwax. What is the probability that an offspring of II-1 and II-2 has dry ear wax?

a. 1% b. 5% c. 9% d. 10%

Biology & Microbiology

The type(s) of bond(s) produced when atoms share electrons equally is/are

A) a nonpolar covalent bond. B) a hydrogen bond. C) an ionic bond. D) a polar covalent bond. E) both polar covalent and ionic bonds.

Biology & Microbiology

When an mRNA moves into the cell's cytoplasm, it first becomes associated with a:

A) transcription factor. B) protein. C) ribosome. D) tRNA.

Biology & Microbiology