Which base is found in DNA, but not in RNA?
a. uracil
b. cytosine
c. guanine
d. thymine
e. adenine
Ans: d. thymine
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What structure may have acted as a boundary for a cell-like environment before protocells formed?
a. acidic water from volcanic springs b. chambers in rocks c. metal ions from rocks d. clay e. lipid membrane
Which provides a base of support for the bones of the forelimbs and hind limbs to the axial skeleton in a human?
A) pectoral girdle B) pelvic girdle C) cervical vertebrae D) appendicular skeleton
Muscle fibers generate maximum force:
A. at intermediate lengths. B. when pulled to long lengths before contraction. C. when contracting at short lengths. D. when the myosin filaments contact the Z discs. E. when the overlap between actin and myosin is minimal.
Which of the following are examples of kinetic energy?
A. electrons in chemical bonds of the food molecules, proton gradients established, ATP molecules B. All of the answer choices are correct. C. electrons from food molecules moving through the electron transport chain, and protons moving through ATPase D. protons moving through ATPase by facilitated diffusion, ATP molecules E. electrons from food molecules moving through electron transport chain, proton gradients established