In positional cloning, the inheritance of a disease in a pedigree was linked to the inheritance of
A. other diseases or conditions.
B. a specific blood type.
C. other genes whose loci were known.
D. marker sequences produced by restriction enzymes.
E. all of these.
D
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Which of the following statements is true regarding respiration in mammals? Select all correct choices
A. Air moves in a uni-directional fashion through the lungs. B. Gas exchange occurs in the bronchioles. C. Gas exchange occurs in the alveoli. D. Respiration depends on changes in air pressure in the chest cavity. E. Respiration depends on contractions of the diaphragm.
Some protist cell surfaces have __________, including silica or calcium carbonate.
Fill in the blank(s) with the appropriate word(s).
What is population variation?
a. variation between two adjacent populations b. variation that results from two populations mixing and interbreeding c. the distribution of phenotypes among individuals in a population d. a gradient of change from one edge of a population to the other
Skeletal muscle appears striped because of the
A) way the sarcoplasmic reticulum wraps around the myofibril. B) arrangement of thick and thin filaments. C) accessory proteins in thin filaments. D) orientation of T tubules. E) arrangement of ions across the sarcoplasmic reticulum membrane.