DNA contains the nitrogenous base ________ instead of ________, which is found only in RNA.
A) a deoxyribose sugar; a ribose sugar
B) uracil; thymine
C) uracil; guanine
D) thymine; uracil
B) uracil; thymine
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Which of the following statements does NOT describe an attribute of conifer resin?
A. It hardens on contact with air. B. It forms amber. C. It traps insects and other organisms. D. It is an antibiotic and prevents infections. E. It flows through ducts in the wood and leaves.
Collections of lymphoid tissues, called MALT, are strategically placed throughout the respiratory, digestive, and genitourinary systems. Which one of these is located at the end of the small intestine?
What will be an ideal response?
A suggested and testable explanation for an event is called a ________.
a) control b) theory c) hypothesis d) variable
Sharks
Select one: a. have bone skeletons. b. lack jaws. c. have a keen sense of smell. d. lack the lateral line system of bony fishes. e. do not have paired fins.