Which statement about birds is true?
a. Bird feathers are modified reptilian scales.
b. Bird lungs are similar to mammalian lungs.
c. A bird’s primary feathers provide lift.
d. Most bird species have two ovaries.
a. Bird feathers are modified reptilian scales.
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Escherichia coli, a member of the family Enterobacteriaceae, was resistant to the antibiotic vancomycin. Which of the following statements explains this discrepancy?
a. The vancomycin disk has most likely ex-pired. b. Vancomycin should only be used in viral infections, not bacterial infections. c. The plate is most likely contaminated with another organism. d. No discrepancy is present. E. coli is resis-tant to vancomycin.
The first amino acid of a new polypeptide chain is
a. alanine. b. cysteine. c. variable. d. phenylalanine.
e. methionine.Which of the following statements is FALSE
about cowbirds? a. Their host relationship is similar to cuckoos. b. They are insect-eaters. c. Females can lay thirty eggs in a season. d. Cowbird hatchlings are recognized as imposters by host parents. e. They now parasitize at least fifteen species of native North American birds
The Retinal Pigment Epithelium (RPE) performs all of the following functions, EXCEPT
A. Absorption of Excess Light B. Bridge the Gap between the Choroid and the Photoreceptors C. Maintenance of the Blood-Retina Barrier D. Phagocytosis of Old Cone & Rod Segments E. Storage of Vitamin D