Photosynthetic organisms provide two products that animals could not live without: ________ and ________
Fill in the blank(s) with correct word
organic molecules; oxygen
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The composition of the normal microbiota may be affected by
A. hormonal changes. B. use of antibiotics. C. obesity level. D. diet. E. All of the choices are correct.
Which of the following are true statements about gibberellins? Check all that apply.
_____ They can restore normal growth and development in certain dwarf mutants. _____ They inhibit amylase and other hydrolytic enzymes. _____ They are produced in the apical regions of shoots and roots. _____ They promote internode elongation. _____ They hasten seed germination.
Why is there a wide variation in skin color in humans?
A. Crossing-over increases the rate of color variation. B. Skin color is a polygenic trait. C. Environmental changes like improvements in diet change the color of the skin over time. D. Artificial selection causes variation in skin color. E. Genetic drift selects for genes that blend skin colors.
Anabolic reactions may be characterized as
A. exergonic. B. breaking large molecules into smaller molecules. C. forming large molecules from smaller molecules. D. producing ATP. E. breaking large molecules into smaller molecules to produce ATP.