The observable expression of the genes present in an organism is called its
A. phenotype.
B. genotype.
C. pedigree.
D. karyotype.
A. phenotype.
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Which of the following elements can foster the process of crossing over?
A. RNA polymerase B. promoter elements C. enhancer elements D. transposable elements E. topoisomerase
Pertussis has all of the following characteristics except
A. DTaP immunization will prevent it. B. the early stage resembles a cold with nasal discharge and sneezing. C. transmission is by respiratory droplets. D. the catarrhal stage has persistent, hacking coughs with "whoops." E. the pathogen has virulence factors to destroy the action of respiratory cilia.
Fungi spores are haploid; what distinguishes haploid spores?
A. Haploid spores have a double set of chromosomes, half the number of chromosomes of diploid organisms. B. Like diploid organisms, haploid spores have a single set of chromosomes. C. Haploid spores have a single set of chromosomes, half the number of chromosomes of diploid organisms. D. Like diploid organisms, haploid spores have a double set of chromosomes.
Blood flow slows in capillaries due to their ________.
A. valves B. small diameters C. large collective cross-sectional area D. small collective cross-sectional area E. short lengths