Noting that half of a population is between the ages of 7 and 10 illustrates which of the following?
a. an r-selection graph
b. a k-selection graph
c. an age structure
d. a growth curve
c. an age structure
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Which statement is true?
a. Only diploid plant stages are free-living. b. All spores are clones of their parent cells. c. Most plant and fungi spores are haploid. d. Gametophytes are larger than sporophytes.
The scope of variation among living organisms is referred to as ____
a. heritability b. the biosphere c. biodiversity d. taxonomy e. the ecosystem
Black bread mold is __________, which means that it is self-sterile
a. heterozygous b. heterothallic c. hetertrophic d. mycotoxic e. coenocytic
When scientists were attempting to determine the structure of the genetic code, Crick and coworkers found that when three base additions or three base deletions occurred in a single gene, the wild-type phenotype was sometimes restored
These data supported the hypothesis that ________. A) the code is triplet B) AUG is the initiating triplet C) the code contains internal punctuation D) there are three amino acids per base E) the code is overlapping