Sea snakes, which are reptiles, are similar in body form to eels, which are fish. Sea snakes and eels therefore
demonstrate:a.
role reversal.
b. ancestral traits
c. homologous traits.
d. divergent evolution.
e. convergent evolution.
e
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The short, numerous appendages used by some bacterial cells for adhering to surfaces are called ________.
A. flagella B. pili C. fimbriae D. cilia E. periplasmic flagella (axial filaments)
An organism's realized niche is always smaller than its fundamental niche
Indicate whether the statement is true or false
Which of the following is not a process in the scientific method?
A. systematic observation B. belief in a preconceived idea C. formulate a hypothesis D. development of a theory E. laboratory experimentation
The yeast genome was sequenced more than 15 years ago, yet the total number of genes continues to be refined
The sequencing of closely related yeast species was important for validating the identity of short (less than 100 nucleotides long) open reading frames (ORFs) that were otherwise difficult to predict. What is the main reason that these short ORFs are hard to find without the genomes of other yeast for comparison? (a) Short ORFs are found only in yeast. (b) The short ORFs code for RNAs. (c) Many short stretches of DNA may lack a stop codon simply by chance, making it difficult to distinguish those DNA sequences that code for proteins from those that do not. (d) Short ORFs occur mainly in gene-rich regions, making them difficult to identify by computer programs.