If you cut a herbaceous stem and observe fluids continually seeping upward and out of the cut, it is most likely due to
A. active transport by phloem.
B. tension caused by transpiration.
C. cohesion to the xylem walls.
D. turgor pressure.
E. root pressure.
Answer: E
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Life apparently originated on Earth about
A. 1 million years ago. B. 6000 years ago. C. 4.5 billion years ago. D. 8 billion years ago. E. 3.5 billion years ago.
Human genetics can be most effectively studied using:a
offspring raised under controlled conditions. b. experimental matings between true-breeding strains. c. controlled matings. d. population studies of large extended families. e. population studies of small extended families.
The bonds between the atoms that make up water molecules are called
a. covalent bonds. b. hydrogen bonds. c. ionic and covalent bonds. d. covalent and hydrogen bonds.
Mutant versions of genes that are normally involved in promoting the development of cancer are known as ________
A) oncogenes B) attenuators C) tumor suppressors D) proto-oncogenes E) malignant genes