Identical twins are genetically the same but do not always look or act exactly alike. Propose a hypothesis to explain this
What will be an ideal response?
Many characters are a result of both heredity and environment. Environmental factors that may make the twins different are nutrition, which influences height and weight; exposure to the sun, which influences skin tone; and experiences, which influence intelligence.
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What gene must be expressed in a Drosophila for it to develop into a female fly?
A. SRY B. Hox C. SXL D. sex-1
A bowl of sugar water is very stable. In a cell, however, it is rapidly broken down into carbon dioxide and water, releasing stored energy. What is the best explanation for this observation?
A. Enzymes in the cell catalyze the breakdown of the glucose. B. Cells use energy to break down the glucose. C. Glucose is only broken down while dissolving into a watery solution, such as inside the cell. D. Glucose cannot be broken down outside of a cell. E. Glucose becomes more chemically reactive inside of a cell.
Ectomycorrhizae:a
form arbuscules. b. are intracellular. c. coat the plant root. d. have glomeromycetes as the fungal component. e. supply plants with organic molecules.
Which of the following is a true statement concerning spores and gametes?
a. Gametes and spores are both diploid. b. Gametes and spores both fuse with other gametes and spores to produce diploid organisms. c. Gametes are haploid and spores are diploid. d. Gametes are diploid and spores are haploid. e. Gametes and spores are both haploid.