Which of the following describes the correct path of air through a bird's respiratory system?
A. trachea, posterior air sacs, lungs, anterior
air sacs, trachea
B. trachea, anterior air sacs, lungs, posterior
air sacs, trachea
C. trachea, lungs, anterior air sacs, posterior
air sacs, trachea
D. trachea, lungs, posterior air sacs, anterior
air sacs, trachea
E. trachea, anterior air sacs, posterior air
sacs, lungs, trachea
A
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Do you think that the altered amino acid sequence in sickle-cell betaglobin could alter the overall structure of hemoglobin? a. No, a single amino acid substitution is too small of a change to affect a largeprotein
b. Yes, a single amino acid substitution could radically affect the overall structure ofhemoglobin.
Systematists use phylogenetic trees to graphically represent hypothesized evolutionary relationships
among organisms. _____________________ Indicate whether the statement is true or false.
Which of the following organisms has cell walls containing silica?
A. Ciliated protozoa B. Archaea C. Diatoms D. Dinoflagellates
If black fur color is controlled by a dominant allele (B) and brown by its recessive allele (b), give the genotypes of the parents if a black male crossed with a brown female and produces 1/2 black offspring and 1/2 brown offspring.
A. BB male and bb female B. Bb male abd bb female C. Bb male and Bb female D. BB male and BB female E. bb male and Bb female