Indicate the answer choice that best completes the statement or answers the ques
ID: 102463 • Letter: I
Question
Indicate the answer choice that best completes the statement or answers the question. 1. Which of the following is not a reason that AIDS has been difficult to erradicate? a. It is slow acting b. the HIV reverse transcriptase is inaccurate c. the gp120 protein makes a to be ineffective d. HIV evades the innate immune system e. it gives the infected individual multiple symptoms within weeks of infection 2. Which of the following genes in normal cells can be related to oncogenes? a. Cyclins, which regulate the timing of cell division. b. Tumor suppressing proteins. c. Hormone receptors on the surface of the cell. d. Protein kinases, which regulate the activity of cellular proteins. e. Oncogenes include examples of all of these. -3. The protein called p53 is especially important in cancer because: a. Protein p53 has the ability to prevent cells from dividing. b. Protein p53 has the ability to repair mutations. c. Protein p53 can cause damaged cells to enter programmed cell death. d. Protein p53 can prevent cells from dividing and cause to enter programmed cell death. e. All of these. 4. Viruses can be genetically engineered to specifically target cancer cells. a. True b. False 5. Which of the following contributes to the variability of the immunoglobulins? a. A variety of different DNA sequences are physically attached together to generate a huge number different antibody genes b. The linking regions between these DNA sequences are also highly variable. c. The synthesis of mRNA in the antibody cells is very variable, producing many different proteins fro gene. d. There are several hundred to one thousand different genes for the variable part of the antibody seq e. All of these mechanisms contribute to the variety of antibodies in the immune system. -6. An epitope is a. a disease-causing organism b. a binding site for an antigen on an antibody. c. a class of plasma cell. d. a protein secreted by T cells to activate the growth of other cells.Explanation / Answer
1.b.HIV reverse transcriptase is inaccurate.
2.e,Oncogenes includes all of these.
3.e.all of these
4.True. An oncolytic virus is a virus that preferentially infects and kills cancer cells.
6.b. The part of an antigen molecule to which an antibody attaches itself- EPITOPE.
7.a. an antibody molecule has two binding sites, because such an antibody can join two antigen molecules together, and many such antibodies can glue many same antigen molecules.
8.b. B lymphocytes or B cells , are a type of white blood cell of the lymphocyte subtype. They function in the humoral immunity component of the adaptive immune system by secreting antibodies.
9.d.Type 1 diabetes is an autoimmune disease.Apart from that lupus and rheumatoid arthritis are also autoimmune diseases.
10.a. true. Clonal selection is a process proposed to explain how a single B or T cell that recognizes an antigen that enters the body is selected from the pre-existing cell pool of differing antigen specificities and then reproduced to generate a clonal cell population that eliminates the antigen.
11.c.T cells recognize these complexes using their T cell receptors (TCRs). These cells process antigens and present them to T-cells.
12.a.Monoclonal antibodies are formed by B cells.
13.a.
15.b.
16.a.
17.
18.b Capsid is viral protein.
19.d.
20.a.Lysogeny is characterized by integration of the bacteriophage nucleic acid into the host bacterium's genome or formations of a circular replicon in the bacterial cytoplasm.