Ques:Answer the following question given this paragraph:   A solution is a mixture of two or more substances that has the same composition throughout. Some solutions are acids, some are bases.   Q: Acidity is measured by what physical property?   Choices:  - kω  - ps  - amp  - ph  A:

Ans:ph
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Ques:Answer the following question given this paragraph:   Chapter 21 1 The three main components are the lymph vessels, the lymph nodes, and the lymph. 3 The bacterium is digested by the phagocyte’s digestive enzymes (contained in its lysosomes). 5 B 7 C 9 A 11 D 13 C 15 B 17 B 19 D 21 D 23 B 25 C 27 B 29 C 31 D 33 A 35 B 37 B 39 The lymph enters through lymphatic capillaries, and then into larger lymphatic vessels. The lymph can only go in one direction due to valves in the vessels. The larger lymphatics merge to form trunks that enter into the blood via lymphatic ducts. 41 Interferons are produced in virally infected cells and cause them to secrete signals for surrounding cells to make antiviral proteins. C-reactive protein is induced to be made by the liver and will opsonize certain species of bacteria. 43 Antigen-specific clones are stimulated as their antigen receptor binds to antigen. They are then activated and proliferate, expanding their numbers. The result is a large number of antigen-specific lymphocytes. 45 IgM is an antigen receptor on naïve B cells. Upon activation, naïve B cells make IgM first. IgM is good at binding complement and thus has good antibacterial effects. IgM is replaced with other classes of antibodies later on in the primary response due to class switching. 47 Tuberculosis is caused by bacteria resistant to lysosomal enzymes in alveolar macrophages, resulting in chronic infection. The immune response to these bacteria actually causes most of the lung damage that is characteristic of this life-threatening disease. 49 Antibody response to the cell walls of β-Streptococcus cross-reacts with the heart muscle. Complement is then activated and the heart is damaged, leading to abnormal function. Tolerance is broken because heart myosin antigens are similar to antigens on the β- Streptococcus bacteria.   Q: Interferons are produced in virally infected cells and cause them to secrete signals for surrounding cells to make what?   Choices:  - overwhelm proteins  - resist proteins  - Raising Proteins  - antiviral proteins  A:

Ans:antiviral proteins
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Ques:Answer the following question given this paragraph:   26.3 Angiosperms Angiosperms are the dominant form of plant life in most terrestrial ecosystems, comprising about 90 percent of all plant species. Most crops and ornamental plants are angiosperms. Their success comes from two innovative structures that protect reproduction from variability in the environment: the flower and the fruit. Flowers were derived from modified leaves. The main parts of a flower are the sepals and petals, which protect the reproductive parts: the stamens and the carpels. The stamens produce the male gametes in pollen grains. The carpels contain the female gametes (the eggs inside.   Q: What is the dominant form of plant life in most terrestrial ecosystems, comprising about 90 percent of all plant species?   Choices:  - pteridophytes  - gymnosperms  - bryophytes  - angiosperms  A:

Ans:angiosperms
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Ques:Answer the following question given this paragraph:   Figure 15.2 All animals that derive energy from food are heterotrophs. The (a) black bear is an omnivore, eating both plants and animals. The (b) heartworm Dirofilaria immitis is a parasite that derives energy from its hosts. It spends its larval stage in mosquitos and its adult stage infesting the hearts of dogs and other mammals, as shown here. (credit a: modification of work by USDA Forest Service; credit b: modification of work by Clyde Robinson).   Q: All animals that derive energy from food are classified as what?   Choices:  - lifeforms  - paleotrophs  - heliotrophs  - heterotrophs  A:

Ans: