IB DP Biology: HL復習筆記11.1.5 Zoonosis
Zoonosis Some diseases are?species specific?whilst others can?cross species barriers?to infect multiple different species Species-specific disease may be?unable to cross the species barrier?for man...
IB DP Biology: HL復習筆記11.1.4 Smallpox Vaccine & Eradication
Jenner's Ethics Introduction The principles underpinning vaccinations were discovered by?Edward Jenner?in the 1700s when he developed the?first smallpox vaccine Smallpox was a highly infectious dis...
IB DP Biology: HL復習筆記11.1.3 Antibodies, Vaccines & Immunity
Antibodies: Function The function of?antibodies?produced by B-cells is to?destroy pathogens?within the body This can be done either?directly, or by?recruiting other immune cells Antibodies aid the ...
關于2022夏季GCSE、AS和A-Level考試成績說明！
近日，英國資格與考試監督管理辦公室（ofqual）發布最新通知：《關于2022夏季GCSE、AS和A-Level考試成績說明》。 圖源：英國政府網 1，ofqual：2022夏季考試成績說明 1、2022年夏季考試，考試委員采用的評分方法...
IB DP Biology: HL復習筆記11.1.2 Specific Immune Response
Specific Immune Response T-Helper cells (a type of lymphocyte that responds to specific antigens) and mature?B cells?(another type of lymphocyte) have specific receptors located on their cell surfa...
IB DP Biology: HL復習筆記11.1.1 Antigens
Antigens Every organism has cells with?unique molecules?on the cell surface membrane which act as?markers?to?identify?it These unique markers are?macromolecules?and they allow?cell-to-cell recognit...
IB DP Biology: HL復習筆記10.3.5 Skills: Comparing Allele Frequencies Between Populations
Populations & their Allele Frequencies Comparison of allele frequencies of geographically isolated populations Allele frequency is a term that assigns a?relative frequency?of an allele at a par...
IB DP Biology: HL復習筆記10.3.4 Polyploidy & Speciation
Polyploidy & Speciation NOS: Looking for patterns, trends and discrepancies—patterns of chromosome number in some genera can be explained by speciation due to polyploidy When patterns and trend...
IB DP Biology: HL復習筆記10.3.3 Speciation
Gradualism & Speciation Speciation can be defined as the emergence of new and distinct species that are reproductively isolated from other separate species Two theories exist to explain the eme...
