Gymnosperms include plants that demonstrate which of the following characteristics? Select all correct choices
A. flesh-covered seeds
B. double fertilization
C. pollen-containing cones
D. vascular cambia
E. photosynthetic stems
F. multicellular xylem vessels
A,B,C,D,E,F
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Using your knowledge of the Laws of Energy Conversions, explain why recent energy crises are really a problem of energy in the correct form to do work (electrical, chemical, etc.) as opposed to an actual energy shortage
What will be an ideal response?
Repressors
a. bind to operators. b. lie between operators. c. lie between promoters. d. lie downstream from operators. e. are part of an operon.
The limited number of bacterial strains that are susceptible to infection by a specific phage are referred to as the ___________ of that bacteriophage.
A) host range B) phage strain C) plaques
Which endocrine gland is the main center for control of the internal environment?
A. Pineal B. Hypothalamus C. Thyroid D. Adrenal cortex E. Thalamus