questions below. 08 Eorect anwer Ha Choose the BEST answer for the multiple gues

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questions below. 08 Eorect anwer Ha Choose the BEST answer for the multiple guess then fill in both letters for that line on the scantron form. If you have questions, please ask. 1. A localized group of organisms that belong to the same species is called a 2. The main source of energy for producers in an ecosystem is 3. A water sample from a hot thermal vent contained a single-celled organism that had a cell wall but lacked a nucleus A) biosystem B) community C) population. D) ecosystem E) family A) light energy B) kinetic energy. C) thermal energy. D) chemical energy. E)ATP. What is its most likely classification? A) Eukarya B) Archaea C) Animalia E) Fungi 4. About 25 of the 92 natural elements are known to be essential to life. Which four of these 25 elements make up approximately 96% of living matter? A) carbon, sodium, hydrogen, nitrogen B) oxygen, hydrogen, calcium, nitrogen C) carbon, oxygen, nitrogen, calcium D) carbon, oxygen, phosphorus, hydrogen E) carbon, hydrogen, nitrogen, oxygen 5. Water molecules are able to form hydrogen bonds with A) compounds that have polar covalent bonds. B) oxygen gas (O2) molecules. C) any compound that is not soluble in water D) oils E) chloride ions. 6. Buffers are substances that help resist shifts in pH by A) releasing H' to a solution when acids are added B) donating H to a solution when bases are added. C) releasing OH to a solution when bases are added D) accepting H" from a solution when acids are added E) both donating H' to a solution when bases are added, and accepting H+ when acids are added. 7. The bonds that are broken when water vaporizes are A) ionic bonds. B) nonpolar covalent bonds C) covalent bonds between atoms within water molecules D) hydrogen bonds between water molecules. E) polar covalent bonds. 8. The complexity and variety of organic molecules is due to A) the chemical versatility of carbon atoms. B) their interaction with water D) the variety of rare elements in organic molecules. E) their tremendously large sizes. C) the fact that they can be synthesized only in living organisms. Stanley Miller's 1953 experiments proved that A) life arose on Earth from simple inorganic molecules 9. B) organic molecules can be synthesized abiotically under conditions that may have existed on early Earth C) life arose on Earth from simple organic molecules, with energy from lightning and volcanoes D) the conditions on early Earth were conducive to the origin of life. E) the conditions on early Earth were conducive to the abiotic synthesis of organic molecules 10. What is the chemical reaction mechanism by which cells make polymers from monomers? A) phosphodiester linkages B) dehydration reactions C) the formation of disulfide bridges between monomers D) hydrolysis E) ionic bonding of monomers 11. If cells are grown in a medium containing radioactive 's, which of these molecules will be labeled? C) proteins D) amylose E) both proteins and nucleic acids A) phospholipids B) nucleic acids 12. What aspects of protein structure are stabilized or assisted by hydrogen bonds? A) primary structure B) secondary structure E) secondary, tertiary, and quaternary structures, but not primary structure C) tertiary structure D) quaternary structure 13. All of the following are part of a prokaryotic cell except A) DNA B) a cell wall. C) a plasma membrane. D) ribosomes. E) an endoplasmic reticulum.

Explanation / Answer

1) By definition, individuals of a population are of same species, hence (C)

2) Light energy is the main source but some bacteria can use chemical energy to make food hence answer is both (a) AND (d)

3) Only prokaryotes lack a nucleus, that includes Bacteria and Archeae hence answer is (b)

4) (e) is correct as these are present in biomolecules in large quantities,

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