CAMPBELL BIOLOGY MOD MASTERING (18 WEEK)
CAMPBELL BIOLOGY MOD MASTERING (18 WEEK)
12th Edition
ISBN: 9780136920335
Author: Urry
Publisher: PEARSON
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Chapter 43, Problem 7TYU
Summary Introduction

Introduction: “Adaptive immunity” has “humoral response” and “cell-mediated response”. The humoral response is produced by the antibodies against the “pathogens in body fluids”. The cell-mediated response is produced by cytotoxic cells. The antibodies and cytotoxic cells are derived from lymphocytes. The lymphocytes develop from the bone marrow. Some lymphocytes undergo maturation in bone marrow itself, which are called as “B Lymphocytes”. The other remaining lymphocytes mature in thymus and are called as “T Lymphocytes”. Helper T cells and cytotoxic T cells are derived from “T Lymphocytes”. The macrophages are the “antigen-presenting cells” and activate the “T-helper” cells.

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Which of the following would not help a virus avoid triggeringan adaptive immune response?(A) having frequent mutations in genes for surface proteins(B) infecting cells that produce very few MHC molecules(C) producing proteins very similar to those of other viruses(D) infecting and killing helper T cells
Which of the following processes occurs in both lytic and nonlytic viral infections?(i) Infected cell ruptures to release viral particles.(ii) Viral mRNAs are transcribed by the host-cell translation machinery.(iii) Viral proteins and nucleic acids are packaged to produce virions.
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