When you sprinkle table salt on your food, the salt
A. ionizes.
B. dissociates.
C. forms covalent bonds with the food.
D. undergoes an acid-base reaction.
B. dissociates.
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Which of these is designed by researchers to test only a single prediction of a hypothesis at a time?
a. controlled experiment b. experimental variable c. control group d. controlled variable e. experimental constant
Mesophyll cells are:a
arranged tightly together. b. separated by intercellular spaces. c. responsible for the opening and closing of stomata. d. devoid of chloroplasts. e. covered by a waxy cuticle, which they secrete.
Choose the phase of meiosis in column 2 that best matches each event in column 1
A) telophase I B) prophase I C) prophase II D) metaphase I E) telophase II F) metaphase II G) anaphase I H) anaphase II 1) aligning of bivalents in the center of a spindle 2) genetic recombination events take place 3) separation of homologous chromosomes 4) one haploid set of replicated chromosomes at each spindle pole 5) divisible into five distinct stages 6) aligning of monovalents in the center of a spindle 7) one haploid set of unreplicated chromosomes at each spindle pole 8) pairing of homologous chromosomes 9) chiasmata are visible 10) separation of sister chromatids 11) shortest stage
The embryo sac with seven cells and eight nuclei undergoes double fertilization
a. Mosses b. Ferns c. Conifers d. Gingkos e. Angiosperms