The oxygen needed for respiration moves from the lungs and into capillaries by simple diffusion. Once in the capillaries, what molecule or other component of blood is responsible for transporting oxygen in the circulatory system?
A. There is no transport molecule; oxygen
remains free in the blood.
B. white blood cells
C. hemoglobin
D. cadherins
C
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As blood flows through a capillary bed,
a. blood pressure increases. b. blood pressure remains constant. c. blood pressure decreases. d. blood doesn't move through capillaries. e. none of these occur
Which one of the following effects is NOT the effect of auxin?
A. Promotes growth by cell enlargement B. Promotes apical dominance C. Stimulates formation of roots on a shoot D. Stimulates division of shoot apical meristem cells E. Stimulates development of lateral buds
Which of these is a major trend in land plant evolution?
A) the trend toward smaller size B) the trend toward a gametophyte-dominated life cycle C) the trend toward a sporophyte-dominated life cycle D) the trend toward larger gametophytes
In Drosophila, sex is determined by a balance between the number of haploid sets of autosomes and the number of ________
A) X chromosomes B) telomeres C) nucleolar organizers D) Y chromosomes E) centromeres