Softwood is the wood:a
found at the center of a tree.
b. of cone-bearing gymnosperms.
c. of flowering plants.
d. formed when water is abundant.
e. formed when water is less abundant.
B
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Which of the following best describes the ploidy level of the cells found in a fertilized embryo sac?
A) All cells are diploid. B) All cells are triploid. C) All cells are polyploid. D) The ploidy level varies among species. E) There are haploid, diploid, and triploid cells.
The geologic time scale is subdivided on the
basis of a. the appearance of different radioactive isotopes in different strata. b. levels of background extinction. c. periods of mass extinction. d. the appearance of different radioactive isotopes in different strata and levels of background extinction. e. the appearance of different radioactive isotopes in different strata, levels of background extinction, and periods of mass extinction.
Which of the following reactions is an example of dehydration synthesis?
A) Fat ? fatty acids + glycerol B) Glucose + galactose ? lactose C) Peptide ? alanine + glycine D) Cellulose ? glucose E) Glycogen ? glucose subunits
When water ionizes, it produces equal amounts of hydrogen and hydroxide ions that can reassociate with each other. The pH of water is: 5-9-2013
A. 3 B. 4 C. 5 D. 6 E. 7