Answer the following question given this paragraph: Telescopes that use lenses to bend light are called refracting telescopes , or refractors ( Figure below ). The earliest telescopes were all refractors. Many amateur astronomers still use refractors today. Refractors are good for viewing details within our solar system. Craters on the surface of Earth's Moon or the rings around Saturn are two such details. Q: What are telescopes that use lenses to bend light called? Choices: - reflecting telescopes - sliding telescopes - layering telescopes - refracting telescopes A:
refracting telescopes
(Question)
Answer the following question given this paragraph: Chapter 42 1 Figure 42.11 C 3 Figure 42.16 If the blood of the mother and fetus mixes, memory cells that recognize the Rh antigen can form late in the first pregnancy. During subsequent pregnancies, these memory cells launch an immune attack on the fetal blood cells. Injection of anti-Rh antibody during the first pregnancy prevents the immune response from occurring. 4 D 6 A 8 D 10 B 12 D 14 C 16 C 18 D 20 C 22 If the MHC I molecules expressed on donor cells differ from the MHC I molecules expressed on recipient cells, NK cells may identify the donor cells as "non-self" and produce perforin and granzymes to induce the donor cells to undergo apoptosis, which would destroy the transplanted organ. 24 An antigen is a molecule that reacts with some component of the immune response (antibody, B cell receptor, T cell receptor). An epitope is the region on the antigen through which binding with the immune component actually occurs. 26 The TH1 response involves the secretion of cytokines to stimulate macrophages and CTLs and improve their destruction of intracellular pathogens and tumor cells. It is associated with inflammation. The TH2 response is involved in the stimulation of B cells into plasma cells that synthesize and secrete antibodies. 28 T cells bind antigens that have been digested and embedded in MHC molecules by APCs. In contrast, B cells function themselves as APCs to bind intact, unprocessed antigens. 30 Cross reactivity of antibodies can be beneficial when it allows an individual's immune system to respond to an array of similar pathogens after being exposed to just one of them. A potential cost of cross reactivity is an antibody response to parts of the body (self) in addition to the appropriate antigen. Q: An antigen is a molecule that reacts with some component of the what response? Choices: - digestion - fight or flight - hormones - immune A:
(Answer)
immune
Ques: Answer the following question given this paragraph: Q: What property makes bone marrow cells ideal for gene therapy? Choices: - behavior reproduction - irreversible reproduction - Matching - lifelong reproduction A:
Ans: lifelong reproduction
(Q).
Answer the following question given this paragraph: When light is refracted its wavelength and speed change; however, its frequency remains the same as the frequency of the light source. Proof of this is that light retains its original color under water. For example, blue light is still blue under water. Q: Light retains its original color under water because what remains the same when light is refracted? Choices: - wave length - density - sound - frequency A:
(A).
frequency
Ques:Answer the following question given this paragraph: The warm-air vent is placed near the floor of the room. Warm air is less dense than cold air so it rises. If the warm-air vent were placed near the ceiling instead, how would this affect the transfer of thermal energy throughout the room?. Q: What property of warm air causes it to rise above cold air? Choices: - greater pressure - greater density - higher temperature - lower density A:

Ans:lower density
Ques: Answer the following question given this paragraph: The organ systems of the body work together to carry out life processes and maintain homeostasis. Q: The organ systems of the body work together to carry out life processes and maintain what? Choices: - movement - freshness - consciousness - homeostasis A:
Ans:
homeostasis