Answer the following question given this paragraph: Bones are the main organs of the skeletal system. The skeletal system also includes cartilage and ligaments. Q: Bones are the main organs of what system, which also includes cartilage and ligaments? Choices: - lymphatic system - digestive system - endocrine system - skeletal system A:
skeletal system
(Question)
Answer the following question given this paragraph: Isotopes of Hydrogen Hydrogen, the most abundant element in the universe, is the ultimate source of all other elements by the process of nuclear fusion. (For more information on nuclear fusion, seeChapter 20 "Nuclear Chemistry". ) Table 21.2 "The Isotopes of Hydrogen" compares the three isotopes of hydrogen, all of which contain one proton and one electron per atom. The most common isotope is protium (1H or H), followed by deuterium (2H or D), which has an additional neutron. The rarest isotope of hydrogen is tritium (3H or T), which is produced in the upper atmosphere by a nuclear reaction when cosmic rays strike nitrogen and other atoms; it is then washed into the oceans by rainfall. Tritium is radioactive, decaying to 3He with a half-life of only 12.32 years. Consequently, the atmosphere and oceans contain only a very low, steadystate level of tritium. The termhydrogen and the symbol H normally refer to the naturally occurring mixture of the three isotopes. Table 21.2 The Isotopes of Hydrogen. Q: What is the most abundant element in the universe? Choices: - carbon - helium - nitrogen - hydrogen A:
(Answer)
hydrogen
Ques: Answer the following question given this paragraph: Q: What occurs after gametes fuse and form a diploid zygote? Choices: - transcription - electrolysis - reproduction - meiosis A:
Ans: meiosis
(Q).
Answer the following question given this paragraph: Q: What is the attraction of a particular atom for the electrons of a covalent bond called? Choices: - conductivity - ionization - electromagnetism - electronegativity A:
(A).
electronegativity
Ques:Answer the following question given this paragraph: Group 15 is called the nitrogen group. The metalloids in this group are arsenic and antimony. Group 15 also contains two nonmetals and one metal. Q: Which metalloids are found in the nitrogen group? Choices: - polonium and antimony - selenium and antimony - sulfur and polonium - arsenic and antimony A:

Ans:arsenic and antimony
Ques:Answer the following question given this paragraph: After an adaptive defense is produced against a pathogen, typically plasma cells first secrete IgM into the blood. BCRs on naive B cells are of the IgM class and occasionally IgD class. IgM molecules make up approximately ten percent of all antibodies. Prior to antibody secretion, plasma cells assemble IgM molecules into pentamers (five individual antibodies) linked by a joining (J) chain, as shown in Figure 42.23. The pentamer arrangement means that these macromolecules can bind ten identical antigens. However, IgM molecules released early in the adaptive immune response do not bind to antigens as stably as IgGs, which are one of the possible types of antibodies secreted in large quantities upon re-exposure to the same pathogen. Figure 42.23 summarizes the properties of immunoglobulins and illustrates their basic structures. Q: After an adaptive defense is produced against a pathogen, typically plasma cells first secrete immunoglobin, which constitutes about ten percent of all what? Choices: - parasites - hormones - allergies - antibodies A:

Ans:
antibodies