The first function of feathers was most likely:a
as protection from predators.
b. to insulate.
c. to communicate with rivals.
d. as color displays in courtship rituals.
e. as protection from parasites.
d
You might also like to view...
In studying an E. coli strain containing a known frameshift mutation, you isolate a mutant in which this frameshift is suppressed. You therefore expect to find which of the following associated with the suppression? (Assume the frameshift has not been corrected in the coding for the peptide.)
A) suppressor tRNAs encode an amino acid for a stop signal B) suppressor tRNAs encode a four-nucleotide anticodon C) suppressor tRNAs encode a two-nucleotide anticodon D) both choices B and C E) all of the above
Primers are used in both PCR and in DNA sequencing. What is the purpose of the primers?
A. to separate the DNA template strands. B. to provide a 3'- OH for DNA polymerase to build a new DNA strand. C. to terminate synthesis of the growing DNA strand. D. to separate various-sized DNA products. E. to add nucleotides to a growing DNA strand.
List the characteristics of the following groups and identify examples for each: Archaea, Bacteria, and Eukarya. What will be an ideal response?
Arbuscular mycorrhizae are characterized by all of the following features except
A. The fungus can associate with several species of plants. B. They are seen in the earliest vascular plant fossils. C. The fungal component is a glomeromycete. D. Fungal hyphae penetrate plant root cells. E. They are the most common mycorrhizal type.