Which cell has the responsibility of presenting foreign antigens to lymphocytes?
A) cytotoxic CD8+ T lymphocyte
B) dendritic cell
C) helper CD4+ T lymphocyte
D) natural killer
55) Lymph capillaries differ from blood capillaries in all of the following ways except that
A) they are more permeable than most blood capillaries.
B) they carry lymph instead of blood.
C) they are blind-ended.
D) their walls consist of endothelial cells.
56) Which of the following might explain why most people are sick more often as children than as adults in their 20s through 50s?
A) The immune system does not appear until the preteen years.
B) The thymus is so active in children that it fights bacteria so hard that it produces strong symptoms of disease.
C) Because of their small size, children's bodies cannot contain as much lymphoid tissue as those of adults.
D) We build up many varieties of memory lymphocytes during childhood, providing immunity to more and more antigens during adulthood.
57) The bulges that give lymph vessels a string-of-beads appearance are really
A) lymph nodes.
B) pockets for valves.
C) weakenings in the wall of the vessels.
D) temporary constrictions caused by bulging skeletal muscles that squeeze the lymph vessel.
58) Lymphoid tissue contains all of the following elements except
A) T cells.
B) B cells.
D) thick collagen fibers.
59) Clusters of lymph nodes occur in all of the following sites except
A) along the aorta.
B) in the mediastinum.
C) in bones and bone marrow.
D) in the inguinal region.
60) Because the appendix is a narrow tube, it traps microorganisms from the digestive tract, and these microorganisms enter its wall and activate memory lymphocytes for long-term immunity. Another immune organ that traps microorganisms is the
B) bone marrow.
C) palatine tonsil.
D) the spleen.
Draw a bullish vertical spread by trading put options with strike prices K2 = $20 and K4 = $25.Nov 24 2019
A consumer has a choice of spending $13,000 on a Honda or $9,000 on a Subaru. She is observed buying the Subaru. Does this mean the consumer prefers the Subaru? Explain y...Apr 04 2020
Exhibit 3-11Units of Good XMaximum Buying Price Minimum Selling PriceResult1st$12$6(A)2nd117(B)3rd108(C)4th99(D)5th810(E)6th711(F)172.Refer to Exhibit 3-11. ...Dec 09 2019
A beta coefficient of 0 represents an asset that A. is more responsive than the market portfolio B. is unrelated to the market portfolio C. has the same response as the m...Apr 14 2020
Preliminary design of an 8 in. concrete masonry lintel beam is provided on the next page. The details include a cross-section and an elevation of the masonry wall. The li...Jul 09 2020
DNA replication is called semiconservative because half of each of the two new strands of DNA is "old" DNA from the original DNA molecule and half is "new" DNA. (A) Tru...Mar 14 2018
A flaked cereal is of thickness 2L 1.2 mm. The density, specific heat, and thermal conductivity of the flake are 700 kg/m3, cp = 2400 J/kg ∙ K, and k = 0.34 W/m∙ K, respe...Jun 27 2020
Please explain it clear with formulaShow transcribed image textQUESTION 1: An investment costs RM3,000.00 today and provides cash flows at the end of each year for 20 yea...Aug 12 2020
Calculate the goniometer setting, in terms of 2, required to observe the Lß1, Iines for Br at 8.126 when the diffracting crystal is(a) Ethylenediamine d-tartrate(b) Ammon...Jun 22 2020
You are considering two mutually exclusive projects with the following cash flows:ProjectC/F0C/F1C/F2C/F3C/F4C/F5C/F6A$(41,215)$12,500$14,000$16,500$18,000$20,000N/AB$(46...May 24 2018
Welcome to MyCourseHelp Services, World's leading Academic solutions provider with Millions of Happy Students.