Biology > QUESTION PAPER (QP) > Pearson Edexcel Level 3 GCE: Biology B Advanced PAPER 1: Advanced Biochemistry, Microbiology and Ge (All)
Pearson Edexcel Level 3 GCE: Biology B Advanced PAPER 1: Advanced Biochemistry, Microbiology and Genetics
Document Content and Description Below
Answer ALL questions. Some questions must be answered with a cross in a box . If you change your mind about an answer, put a line through the box and then mark your new answer with a cross . 1 The ... pathogenic effects of bacteria can be due to the toxins they release. (a) Endotoxins are released by Gram negative bacteria. (i) Name one type of Gram negative bacteria that releases endotoxins. (1) .................................................................................................................................................................................................................................................................................... (ii) Give one difference between the structure of Gram negative bacteria and Gram positive bacteria. (1) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... (b) Endotoxins are usually less toxic than exotoxins. (i) The LD50 value is the mass of the chemical per kg of body mass that would kill half the number of rodent animals. The LD50 value can be used to indicate how toxic a chemical is. One endotoxin has an LD50 value of 11ngkg–1. [Show More]
Last updated: 2 years ago
Preview 1 out of 32 pages
Buy this document to get the full access instantly
Instant Download Access after purchase
Buy NowInstant download
We Accept:
Reviews( 0 )
$6.00
Can't find what you want? Try our AI powered Search
Document information
Connected school, study & course
About the document
Uploaded On
Feb 01, 2023
Number of pages
32
Written in
All
Additional information
This document has been written for:
Uploaded
Feb 01, 2023
Downloads
0
Views
201
