Biology

Chapter 1 Test A localized group of organisms that belong to the same species is called a A) biosystem B) community C) population D) ecosystem E) family Answer: C 2 Organisms interact with their environments, exchanging matter and energy. For example, plant chloroplasts convert the energy of sunlight into A) the energy of motion B) carbon dioxide and water C) the potential energy of chemical bonds D) oxygen E) kinetic energy Answer: C 3 The main source of energy for producers in an ecosystem is A) light energy B) kinetic energy C) thermal energy D) chemical energy E) ATP Answer: A 4 Which of the following types of cells utilize deoxyribonucleic acid (DNA) as their genetic material but do not have their DNA encased within a nuclear envelope? A) animal B) plant

Ravi Patel Chapter 4,5 organic chemistry- The study of carbon & hydrogen compounds (organic compounds). Tetravalent- 4 electrons in valence shell, Ex. carbon Hydrocarbon- An organic molecule consisting only of carbon and hydrogen. Isomer- One of several compounds with the same molecular formula but different structures and therefore different properties. The three types are structural, geometric, and enantiomers. structural isomer- One or several compounds that have the same molecular formula but differ in the covalent arrangement of their atoms. (DIFFERENT SHAPE) geometric isomer- One of several compounds that have the same molecular formula and covalent bonds between atoms but differ in the spatial arrangements of their atoms owing to the inflexibility of double bonds

1 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) carbon, oxygen, phosphorus, hydrogen C) oxygen, hydrogen, calcium, nitrogen D) carbon, hydrogen, nitrogen, oxygen E) carbon, oxygen, nitrogen, calcium Answer: D 2 Trace elements are those required by an organism in only minute quantities. Which of the following is a trace element that is required by humans and other vertebrates, but not by other organisms such as bacteria or plants? A) nitrogen B) calcium C) iodine D) sodium E) phosphorus Answer: C 3 Which of the following statements is false?

1 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) carbon, oxygen, phosphorus, hydrogen C) oxygen, hydrogen, calcium, nitrogen D) carbon, hydrogen, nitrogen, oxygen E) carbon, oxygen, nitrogen, calcium Answer: D 2 Trace elements are those required by an organism in only minute quantities. Which of the following is a trace element that is required by humans and other vertebrates, but not by other organisms such as bacteria or plants? A) nitrogen B) calcium C) iodine D) sodium E) phosphorus Answer: C 3 Which of the following statements is false?