Which of the following structural characteristics is not normally observed in a dna duplex?
(a) purine-pyrimidine pairs
(b) external sugar-phosphate backbone
(c) uniform left-handed twist
(d) antiparallel strands

Some tools have graduations to show multiple measurements. for example, a ruler may have graduations for both millimeters and centimeters. when measuring the length of an earthworm, which graduations would allow for the most accurate measurement? millimeters centimeters decimeters meters

What is one way intensive agriculture can contribute to climate change? a. tree loss to agriculture increases earth's albedo b. livestock manure absorbs greenhouse gases c. large herds of livestock release greenhouse gases d. fewer trees are available to replenish petroleum stores appex

Which feature of a human community is similar to a niche in a biological community