Index: lams_common/src/java/org/lamsfoundation/lams/tool/service/IQbToolService.java
===================================================================
diff -u
--- lams_common/src/java/org/lamsfoundation/lams/tool/service/IQbToolService.java	(revision 0)
+++ lams_common/src/java/org/lamsfoundation/lams/tool/service/IQbToolService.java	(revision 22c4cfdabd7d9f478114c9ba5ec1c0aeff784c10)
@@ -0,0 +1,19 @@
+package org.lamsfoundation.lams.tool.service;
+
+import java.util.List;
+
+import org.lamsfoundation.lams.qb.model.QbQuestion;
+
+/**
+ * It is an optional interface implemented by tools' services.
+ * It facilitates work with Question Bank.
+ * 
+ * @author Marcin Cieslak
+ *
+ */
+public interface IQbToolService {
+    /**
+     * Replaces existing questions in an activity with ones provided as a parameter. 
+     */
+    void replaceQuestions(long toolContentId, List<QbQuestion> newQuestions);
+}
\ No newline at end of file
Index: lams_tool_lamc/src/java/org/lamsfoundation/lams/tool/mc/mcApplicationContext.xml
===================================================================
diff -u -r2e9ee1c2451a05981f05e9edf89bb3356cf2b147 -r22c4cfdabd7d9f478114c9ba5ec1c0aeff784c10
--- lams_tool_lamc/src/java/org/lamsfoundation/lams/tool/mc/mcApplicationContext.xml	(.../mcApplicationContext.xml)	(revision 2e9ee1c2451a05981f05e9edf89bb3356cf2b147)
+++ lams_tool_lamc/src/java/org/lamsfoundation/lams/tool/mc/mcApplicationContext.xml	(.../mcApplicationContext.xml)	(revision 22c4cfdabd7d9f478114c9ba5ec1c0aeff784c10)
@@ -100,6 +100,7 @@
 					<prop key="update*">PROPAGATION_REQUIRED,-McApplicationException</prop>
 					<prop key="get*">PROPAGATION_REQUIRED, -MccpApplicationException</prop>
 					<prop key="remove*">PROPAGATION_REQUIRED,-McApplicationException</prop>
+					<prop key="replaceQuestions">PROPAGATION_REQUIRED, -MccpApplicationException</prop>
                 	<prop key="resetDefineLater">PROPAGATION_REQUIRED,-java.lang.Exception</prop>
 					<prop key="persistFile">PROPAGATION_REQUIRED,-McApplicationException</prop>
 					<prop key="importToolContent">PROPAGATION_REQUIRED,-McApplicationException</prop>
Index: lams_tool_lamc/src/java/org/lamsfoundation/lams/tool/mc/service/McService.java
===================================================================
diff -u -rbed43f31ad918bbd7f19f6db56fc90fcffcc37bd -r22c4cfdabd7d9f478114c9ba5ec1c0aeff784c10
--- lams_tool_lamc/src/java/org/lamsfoundation/lams/tool/mc/service/McService.java	(.../McService.java)	(revision bed43f31ad918bbd7f19f6db56fc90fcffcc37bd)
+++ lams_tool_lamc/src/java/org/lamsfoundation/lams/tool/mc/service/McService.java	(.../McService.java)	(revision 22c4cfdabd7d9f478114c9ba5ec1c0aeff784c10)
@@ -99,6 +99,7 @@
 import org.lamsfoundation.lams.tool.mc.util.McSessionComparator;
 import org.lamsfoundation.lams.tool.mc.util.McStringComparator;
 import org.lamsfoundation.lams.tool.service.ILamsToolService;
+import org.lamsfoundation.lams.tool.service.IQbToolService;
 import org.lamsfoundation.lams.usermanagement.User;
 import org.lamsfoundation.lams.usermanagement.dto.UserDTO;
 import org.lamsfoundation.lams.usermanagement.service.IUserManagementService;
@@ -121,7 +122,8 @@
  *
  * @author Ozgur Demirtas
  */
-public class McService implements IMcService, ToolContentManager, ToolSessionManager, ToolRestManager, McAppConstants {
+public class McService
+	implements IMcService, ToolContentManager, ToolSessionManager, ToolRestManager, McAppConstants, IQbToolService {
     private static Logger logger = Logger.getLogger(McService.class.getName());
 
     private IMcContentDAO mcContentDAO;
@@ -2117,6 +2119,24 @@
 		: IQbService.QUESTION_MODIFIED_NONE;
     }
 
+    @Override
+    public void replaceQuestions(long toolContentId, List<QbQuestion> newQuestions) {
+	// remove all existing questions
+	McContent mcContent = getMcContent(toolContentId);
+	for (McQueContent mcQuestion : mcContent.getMcQueContents()) {
+	    mcQueContentDAO.delete(mcQuestion);
+	}
+	// this is needed, otherwise Hibernate wants to re-save the deleted MC questions
+	mcContent.getMcQueContents().clear();
+
+	// populate MC with new questions
+	int displayOrder = 1;
+	for (QbQuestion qbQuestion : newQuestions) {
+	    McQueContent mcQuestion = new McQueContent(qbQuestion, displayOrder++, mcContent);
+	    mcQueContentDAO.insert(mcQuestion);
+	}
+    }
+
     private void releaseQbQuestionFromCache(QbQuestion qbQuestion) {
 	mcQueContentDAO.releaseFromCache(qbQuestion);
 	for (QbOption option : qbQuestion.getQbOptions()) {