Which characteristic of birds is essential to their ability to fly?
a. pneumatic bones
b. cutaneous respiration
c. a lateral line
d. mammalian lungs
a. pneumatic bones
You might also like to view...
Which of the following best explains the expectation that asexually reproducing rotifers would have greater sequence differences in the two alleles of a gene than sexually reproducing rotifers?
A. The two alleles of a gene do not recombine in asexual reproduction and thus different mutations accumulate on the two alleles. B. Mutations occur more frequently in asexually reproducing animals than sexually reproducing animals. C. Sexually reproducing organisms evolve more rapidly than asexually reproducing organisms. D. Asexual reproduction increases population sizes more rapidly than sexual reproduction, so more differences accrue. E. All of the answer options are correct.
The comparison of homologous traits in living and extinct organisms is an example of ____
a. comparative morphology b. taxonomy c. historical biogeography d. paleontology e. molecular biology
Short tandem repeats (STRs) are highly variable sets of repeating sequences within the genome. Because the probability of any two having an identical number of repeats at different STR regions within the genome is astronomically low, they are useful for identifying samples of DNA. With so much variability in these regions of DNA, one would assume that STRs:
A) occur outside of protein-coding regions of DNA. B) are responsible for the physical and biochemical variation among individuals. C) are introns. D) are not inherited the same way as other genes. E) are always homozygous
Which infection is marked by labored, noisy breathing and a hoarse cough?
A. Croup B. Rubella C. Measles (rubeola) D. Mumps E. Influenza