For given species or groups of species, some taxonomists and evolutionary biologists disagree on which common ancestry and evolutionary relationships may exist. They may hypothesize different common ancestors (nodes) or descendants (clades). Still, where fossil, or phenotype, or DNA sequence, or other factors make decisions difficult in preparing the cladogram, researchers commonly ensure their interpretation is the most
What will be an ideal response?
parsimonious
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Which of the following is true of the structure of typical transcriptional activators?
A. They contain only one type of motif. B. The regulatory domain contains the DNA-binding motif. C. The DNA-binding domain always binds to the coactivator. D. They contain a regulatory domain that can be functional when separated from the DNA-binding domain.
Imagine that DNA is composed of equal proportions of six different types of nucleotide, instead of the normal four. The six nucleotides are A, C, G, T, X, and Y. In this new type of DNA molecule, A pairs with T, C pairs with G, and X pairs with Y. What would be the average size of the DNA fragments produced when this new DNA is cut by a restriction endonuclease with a four-base recognition sequence?
A) 125 bp B) 256 bp C) 425 bp D) 1056 bp E) 1296 bp
Cells store energy in the form of ____
a. sunlight b. chloroplasts c. carbon dioxide d. glucose e. water
In cases of __________ growth, a population’s
growth is proportional to its size. Fill in the blank(s) with the appropriate word(s).