If the entire history of the Earth is symbolized by a 12-month calendar, dinosaurs and mammals both appear in the
month of ____.
a. August
b. September
c. October
d. November
e. December
ANSWER: e
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Charles and Francis Darwin concluded from their experiments on phototropism by grass seedlings that the part of the seedling that detects the direction of light is the _____
A) tip of the coleoptile B) part of the coleoptile that bends during the response C) base of the coleoptile D) cotyledon E) phytochrome in the leaves
What was the first genetically modified crop introduced onto the market?
What will be an ideal response?
Which of the following statements about bone and its structure is not correct?
A. Bone contains an extracellular matrix of collagen fibers and inorganic calcium phosphate crystals. B. Bone tissue serves as a reservoir for calcium and phosphate ions. C. Bone tissue is not living because it contains inorganic calcium phosphate crystals. D. Bone marrow is a reservoir for blood stem cells E. Bone tissue is a special form of connective tissue.
DNA is a nucleic acid that consists of thousands of smaller, repeating units called nucleotides. What function do nucleic acids serve besides storing genetic information?