of a ribosome. Hydrolytic enzymes are released, breaking it down. Calculate specimen size using a scale bar? Lots of ends mean higher surface area, so more hydrolysis. Describe and explain how he would collect and process his results (5 marks) Collection and Analysis of data: Two groups of seeds, 1 from city trees and 1 from countryside trees.
A-level Biology Previous essay titles and mark schemes - AQA
(2 Marks more molecules move out because of increased hydrostatic pressure but water potential is lower in tissue fluids, so less tissue fluid can reenter the blood. Describe and explain the advantage of bacteria secreting extracellular protease (2 marks some proteins are too large to enter the cells through diffusion or do not have the specific cell membrane carrier proteins. Contains information from beyond the syllabus. Alternative Worksheet 2 This worksheet is an alternative to the activity above. Explain the shape of the curves at 50C and 60C 60C declined more rapidly due to the high amounts of heat energy causing the bonds to be broken, therefore changing the tertiary structure of the enzyme and meaning it no longer has a complementary active. A full 25 mark A-Level Biology Essay addressing the title: There are many different types of relationships and interactions between organisms. This can lead students to ask, "which is the right answer"? Microscopes extend human vision but can we believe what we see using microscopes? When going over the answers students will sometimes have slightly different answers because of small measuring differences. The resources project well on the interactive whiteboard and there is a student worksheet with some extra examples for students to practice. Describe how presentation of an antigen leads to the secretion of antibodies (3 marks phagocytes present the antigens, triggering helper T cells which activate B cells. (1 mark protein and rRNA, describe how ribosomes are used to make polypeptides.
Since I ve seen a lot of people asking for the unofficial mark scheme.
A scientists wanted to investigate a link between the size of seeds and.
Control in cells and in organisms.
Essay s which are very short (under a page in length) should not be awarded.
Marking rigour IA assessment criteria.
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