Answer the following question given this paragraph: electrons, which have a negative electric charge. Q: What kind of charge do electrons have? Choices: - effective - unusual - positive - negative A:
negative
(Question)
Answer the following question given this paragraph: Plants recycle matter in biogeochemical cycles. For example, through transpiration, plants move enormous amounts of water from the soil to the atmosphere. Plants such as peas host bacteria that fix nitrogen. This makes nitrogen available to all plants, which pass it on to consumers. Q: Through what do plants move enormous amounts of water from the soil to the atmosphere? Choices: - perspiration - evaporation - respiration - transpiration A:
(Answer)
transpiration
Ques: Answer the following question given this paragraph: You can greatly reduce your risk of developing type 2 diabetes by maintaining a healthy body weight. Some cases of type 2 diabetes can be cured with weight loss. However, most people with the disease need to take medicine to control their blood glucose. Regular exercise and balanced eating also help. Like people with type 1 diabetes, people with type 2 diabetes must frequently check their blood glucose. Q: What must people with type 1 and type 2 diabetes frequently check? Choices: - blood plasma levels - muscle glucose levels - blood density levels - blood glucose levels A:
Ans: blood glucose levels
(Q).
Answer the following question given this paragraph: Reactions and Compounds of Nitrogen Like carbon, nitrogen has four valence orbitals (one 2s and three 2p), so it can participate in at most four electron-pair bonds by using sp3 hybrid orbitals. Unlike carbon, however, nitrogen does not form long chains because of repulsive interactions between lone pairs of electrons on adjacent atoms. These interactions become important at the shorter internuclear distances encountered with the smaller, second-period elements of groups 15, 16, and 17. (For more information on internuclear distance, see Chapter 7 "The Periodic Table and Periodic Trends", Section 7.2 "Sizes of Atoms and Ions" and Chapter 8 "Ionic versus Covalent Bonding", Section 8.2 "Ionic Bonding". ) Stable compounds with NN bonds are limited to chains of no more than three N atoms, such as the azide ion (N 3). Nitrogen is the only pnicogen that normally forms multiple bonds with itself and other second-period elements, using overlap of adjacent np orbitals. Thus the stable form of elemental nitrogen is N 2, whose NN bond is so strong (DNN = 942 kJ/mol) compared with the NN and N=N bonds (DNN = 167 kJ/mol; DN=N = 418 kJ/mol) that all compounds containing NN and N=N bonds are thermodynamically unstable with respect to the formation of N2. In fact, the formation of the NN bond is so thermodynamically favored that virtually all compounds containing NN bonds are potentially explosive. Again in contrast to carbon, nitrogen undergoes only two important chemical reactions at room temperature: it reacts with metallic lithium to form lithium nitride, and it is reduced to ammonia by certain microorganisms. (For more information lithium, seeChapter 21 "Periodic Trends and the ". ) At higher temperatures, however, N2 reacts with more electropositive elements, such as those in group 13, to give binary nitrides, which range from covalent to ionic in character. Like the corresponding compounds of carbon, binary compounds of nitrogen with oxygen, hydrogen, or other nonmetals are usually covalent molecular... Q: What is the most electron-pair bonds a nitrogen atom can participate in? Choices: - seven - five - three - four A:
(A).
four
Ques:Answer the following question given this paragraph: The new cells gradually move up through the epidermis toward the surface of the body. As they move, they produce the tough, fibrous protein called keratin. Q: What is the most common cause of lung cancer? Choices: - coal smoke exposure - restaurant smoke exposure - tree smoke exposure - tobacco smoke exposure A:

Ans:tobacco smoke exposure
Answer the following question given this paragraph: Birds are endothermic tetrapod vertebrates. They are bipedal and have wings and feathers. Their organ systems are adapted for flight. For example, they have light-weight air-filled bones and a large four-chambered heart. Birds also have relatively large brains and a high level of intelligence. Q: In birds, lightweight air-filled bones and a large four-chambered heart are examples of adaptations for what purpose? Choices: - speed - long lifespan - mating - flight A:
flight