Tall (D) is dominant to dwarf (d). Give the F2
genotypic and phenotypic ratios of a cross between a
pure-breeding tall plant and a pure-breeding dwarf
plant. What will be an ideal response?
Answer: 1 DD, 2 Dd, 1 dd; 3 tall, 1 dwarf
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An open circulatory system ____
a. contains blood in blood vessels b. is composed of two circulatory systems c. mixes hemolymph and interstitial fluids together d. is more efficient than a closed system e. opens directly to the outside
Increased melatonin levels cause a decrease in
___ production.
a. aldosterone b. ADH c. testosterone d. insulin e. glucagon
What are anabolic steroids?
A. Artificial chemicals that resemble human testosterone B. Medications that can be taken to increase the number of red blood cells C. Hormones that are only produced in the body following the ingestion of specific chemicals D. Hormones that are produced by the human body to increase muscle mass
Energy flow in an ecosystem is NOT cyclic because energy is
A. destroyed as it is used. B. evenly spread out over many organisms. C. converted to heat, which is no longer useful. D. increased as you go up the energy pyramid. E. converted to many kinds of useful energy.