Statements about what a researcher expects to happen to one variable if another variable changes are called ____
a. predictions
b. hypotheses
c. experimental variables
d. theories
e. scientific research
b
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Which of the following actions occurs in many plants when CO2 concentrations are high?
A. Guard cells lose turgor, and the stomata close. B. Water evaporates at a higher rate than usual. C. CAM photosynthesis fixes CO2 at night. D. Oxygen is used by plants for photosynthesis. E. Calcium ions are transported faster through the phloem.
Which of the following was probably NOT a natural energy source that drove the chemical reactions
leading to the first organic molecules?
a. sunlight b. electrical storms (lightning) c. photosynthesis d. radioactive decay e. heat energy released from Earth's core
Which of the following is NOT a major feature
of arthropods? a. jointed appendages b. exoskeleton c. paired segmental nephridia d. specialized and fused-together segments e. specialized sensory structures
The particulate theory of inheritance
A. preceded Mendel's research by a century. B. is based on particles or hereditary units we now call genes. C. was proposed by Mendel. D. All of the choices are correct. E. Two of the above choices are correct.