Over twisting or under twisting of helical DNA generates
A. hypertwists.
B. hypercoils.
C. supercoils.
D. hypotwists.
Answer: C
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What is the primary function of the sinoatrial node?
A. To increase or decrease blood pressure B. To supply the heart muscle with oxygen C. To open and close the heart valves D. To initiate the contraction of the heart
A correct successional sequence is represented by
A. grasses ® mosses ® herbs ® trees ® shrubs. B. trees ® shrubs ® mosses ® herbs ® grasses. C. herbs ® grasses ® mosses ® shrubs ® trees. D. mosses ® herbs ® grasses ® shrubs ® trees.
Multi-stranded protein cords that function as cables inside of cells are the
A. microtubules. B. microfilaments. C. intermediate filaments. D. all of these are correct.
What is the function of the generative cell in conifers?
A. Maturation of the female cone B. Production of the archegonium C. Growth of the megaspore D. Formation of the sperm E. Dispersal of the pollen