The amino acid composition of thermostable proteins is not particularly unusual, except for a bias for increased levels of amino acids that form ?-helices
Indicate whether the statement is true or false.
Answer: TRUE
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Adding helical turns to a closed-circular DNA:
A. will decrease the linking number. B. causes the formation of left-handed supercoils. C. causes the formation of negative supercoils. D. causes the formation of right-handed supercoils. E. does not affect the linking number.
Plaque is _____ caused by _____
a. an infectious disease; bacterial biofilms d. a non-infectious disease; E. coli b. a non-infectious disease; inflammation of the gums e. an infectious disease; E. coli c. an infectious disease; non-pathogenic bacteria
Lines of longitude run perpendicular to the axis of the Earth
Indicate whether the statement is true or false
The C4 photosynthetic pathway is most common in
A) gymnosperm trees. B) angiosperm trees. C) algae, bryophytes, and ferns. D) grasses and shrubs in warm and dry climates.