by natural selection 11. Which is a situation that can be studiod, using Darwin\
ID: 212375 • Letter: B
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by natural selection 11. Which is a situation that can be studiod, using Darwin's theory of evolution A. Living in similar environments, both ancient marine reptiles (ichthyosaurs) and modern marine mammals (dolphins) developed similar body shapes and swimming abilities. B. If some poisonous snakes in an area have conspicuous, bright colors, and predators learn to instinctively avoid snakes with this color pattern, then other, non-poisonous snakes, living in the same area, seem to benefit by "copying" this color pattern, themselves C. Systematic over-use of antibiotics may cause some dangerous species of bacteria to become resistant to those same antibiotics. D. Darwin's theory can be applied to all of the above situations 12. You have an upset stomach from too much stomach acid, and take an antacid tablet. It works by A releasing H' ions into your stomach, thus lowering the phi number there. B. releasing H ions into your stomach, thus increasing the plH number there C. releasing C. releasing OH (bydroxide) ions into your stomach, thus absorbing excess H ions and increasing the pH number there D. releasing O1H (hydroxide) ions into your stomach, thus absorbing excess H ions and lowering the pH number there. 13. Micro RNAs (miRNAs) are important in A. alternative splicing C. chromatin remodeling B. transcriptional activation D. RNA interference (RNAi 14. What is true about hormones? A. They are chemicals that cells only use to communicate with neighboring cells, through gap junctions. B. Only animals produce hormones (plants do not). C. Hormones cannot be carried through the bloodstream, in animals. D. Hormons are used for long distance signaling in both plants and animals 15. The basis of cellular differentiation (development of different cell types, within a multicellular organism such as a human) is A. different cells inheriting different DNA B. cloning, so all cells are identical. C. selective gene expression. D. different cell types mutating DNA into different forms 16. The arrows in the figure show the movement of water in relation H20 to a plant cell. For water to move in the direction indicated, a solution must surround the cell. A. hypertonic B. isotonic C. selectively permeable D. hypotonic Macromolecule matching. (4 points for this section) Match the descriptions with the four categories of macromolecules. OK to use answers more than once. Microtubules Lactose 2. lipids 3. nucleic acids In membranes, with one polar head and two nonpolar tails carbohydrates Cell wall of plant cells The ATP molecule Long carbon chains, either saturated or unsaturated with hydrogen atoms Molecules that include millions of alternating deoxyribose sugars and phosphate Include triose, pentose and hexose varieties of their monomers groups Page 4Explanation / Answer
Que 11.C can be explained by Darwin's theory as only the bacteria which were resistant to antibiotics were able to survive and hence selected by nature that is natural selection. List all the species were killed.
Que 12. C. is the correct answer as antacids work by neutralizing the excess H+ ion in the stomach and hence increasing the pH.
Que 13. A. Alternative splicing.
Que 14. D.Hormones are used for lone distance signalling (endocrine).
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