Answer the following question given this paragraph: Complement An array of approximately 20 types of proteins, called a complement system, is also activated by infection or the activity of the cells of the adaptive immune system and functions to destroy extracellular pathogens. Liver cells and macrophages synthesize inactive forms of complement proteins continuously; these proteins are abundant in the blood serum and are capable of responding immediately to infecting microorganisms. The complement system is so named because it is complementary to the innate and adaptive immune system. Complement proteins bind to the surfaces of microorganisms and are particularly attracted to pathogens that are already tagged by the adaptive immune system. This "tagging" involves the attachment of specific proteins called antibodies (discussed in detail later) to the pathogen. When they attach, the antibodies change shape providing a binding site for one of the complement proteins. After the first few complement proteins bind, a cascade of binding in a specific sequence of proteins follows in which the pathogen rapidly becomes coated in complement proteins. Complement proteins perform several functions, one of which is to serve as a marker to indicate the presence of a pathogen to phagocytic cells and enhance engulfment. Certain complement proteins can combine to open pores in microbial cell membranes and cause lysis of the cells. Q: Which proteins bind to the surfaces of microorganisms and are particularly attracted to pathogens that are already tagged by the adaptive immune system? Choices: - attractive proteins - mobilize proteins - whereby proteins - complement proteins A:
complement proteins
Answer the following question given this paragraph: Bird beaks are generally adapted for the food they eat. For example, the sharp, hooked beak of a raptor is well suited for killing and tearing apart prey. The long beak of the hummingbird in Figure below co-evolved with the tube-shaped flowers from which it sips nectar. Q: What part of a bird is adapted for the food it eats? Choices: - teeth - head - eye - beak A:
beak
Q: Answer the following question given this paragraph: Only certain types of base pairing are allowed. For example, a certain purine can only pair with a certain pyrimidine. This means A can pair with T, and G can pair with C, as shown in Figure 3.33. This is known as the base complementary rule. In other words, the DNA strands are complementary to each other. If the sequence of one strand is AATTGGCC, the complementary strand would have the sequence TTAACCGG. During DNA replication, each strand is copied, resulting in a daughter DNA double helix containing one parental DNA strand and a newly synthesized strand. Q: A, t, g, and c pairs are associated with what substance that is important in genetics? Choices: - plasma - bacteria - blood - dna A:
A: dna
Question: Answer the following question given this paragraph: Q: In most animals, what sense is related to balance or equilibrium? Choices: - vision - tasting - feeling - hearing A:
Answer: hearing
*Question*
Answer the following question given this paragraph: Energy and heat are expressed in units of joules. Q: Both energy and heat can be expressed in units of what? Choices: - amperes - velocities - ohms - joules A:
**Answer**
joules
(Q).
Answer the following question given this paragraph: Fossil fuels are non-renewable sources of energy that produce environmental damage. Q: What are non-renewable sources of energy that produce environmental damage? Choices: - crop fuels - sunlight - wind - fossil fuels A:
(A).
fossil fuels