Evolution at the genomic level involves changes in
A. DNA and histone relationships.
B. chromosome structure and number.
C. sequences of nucleotides in RNA molecules.
D. incorporation of new organelles such as the mitochondrion.
E. sequences of amino acids in proteins.
Answer: B
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The nematode Caenorhabditis elegans is important to human medicine because:
A. It causes elephantiasis, a disease of the lymph glands that causes the legs of humans to swell. B. It is an intestinal parasite in human digestive tracts. C. It has programmed cell death and therefore is useful in cancer and AIDS research. D. It causes an infection that produces severe anal itching. E. It is transmitted by mosquitoes and causes high fevers.
Trace the path of an inhaled air molecule in a human being.
A. nasal cavity-pharynx-larynx-glottis-trachea-bronchi-bronchioles-alveoli B. nasal cavity-pharynx-glottis-trachea-larynx-bronchi-bronchioles-alveoli C. nasal cavity-pharynx-glottis-larynx-trachea-bronchi-bronchioles-alveoli D. nasal cavity-pharynx-glottis-larynx-trachea-bronchioles-bronchi-alveoli E. nasal cavity-glottis-larynx-trachea-pharynx-bronchi-bronchioles-alveoli
As a bacterium approaches a food source, one would expect
a. runs to become more frequent. b. flagella to stop spinning. c. tumbles to become more frequent. d. flagella to rotate clockwise more frequently.
All of the following are components of the inflammatory process EXCEPT
A) dilation of blood vessels. B) release of histamines and prostaglandins. C) chemotaxis. D) diapedesis. E) antibody synthesis.