Events of fertilisation - Study guides, Class notes & Summaries
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IGCSE-Biology 1a Exam Revision Questions with Detailed Answers for Exam Preparation
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The results for oxygen and carbon dioxide in the samples of breathed-out air taken 
before and after exercise are different. 
Describe and explain these differences. - AnsIn breathed-out air, after exercise there is less oxygen 
and more carbon dioxide. As a higher amount of energy is required during exercise for muscle 
contractions. The muscle cell's respire at a faster rate. Therefore, rate of gas exchange increases. Hence, 
more oxygen is absorbed into the blood and more carbon dioxide i...
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Edexcel A-Level Biology Exam Questions With 100% Correct Answers 2023
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Edexcel A-Level Biology Exam Questions With 100% Correct Answers 2023
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Edexcel A-level biology exam questions and verified answers- A+
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Describe the events of fertilisation that occur after the acrosome reaction. - -Membrane of sperm and egg cell fuse together 
-cortical granules release contents into zona pellucida 
-Zona pellucida thickens 
-Haploid nuclei fuse 
 
Explain how phospholipids form a cell surface membrane - -Hydrophilic parts associate with water 
-Hydrophobic parts repel water 
-a bilayer forms with hydrophobic parts pointing in towards the centre of the bilayer 
 
Describe the role of the CFTR protein in en...
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AQA GCSE BIOLOGY 8461-2F Paper 2 Foundation Tier Question Paper & Mark scheme June 2022.
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GCSE BIOLOGY	F 
Foundation Tier 	Paper 2F 
 
Time allowed: 1 hour 45 minutes 
For Examiner’s Use 
Question	Mark 
1	 
2	 
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10	 
TOTAL	 
Materials 
For this paper you must have: 
•	a ruler 
•	a scientific calculator. 
Instructions 
•	Use black ink or black ball-point pen. 
•	Pencil should only be used for drawing. 
•	Fill in the boxes at the top of this page. 
•	Answer all questions in the spaces provided. 
•	If you need extra space for your answer(s), u...
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Edexcel A-level biology exam questions and answers(2022 exam graded A)
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Edexcel A-level biology exam questions and answers(2022 exam graded A)
And that's how you make extra money
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AQA A level Biology Revised Questions And Answers 2023
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AQA A level Biology Revised Questions 
And Answers 2023 
Describe how you would use a biochemical test to show that a solution contained a nonreducing sugar, such as sucrose. [3] - CORRECT ANSWER-,first reducing sugars test; 
boil with dilute HCl acid then Neutralise with NaHCǑ, add benedict and heat to 95 
degrees C brick red ppt forms if reducing sugar is present 
Describe a chemical test you could carry out to show that a piece of coconut contains 
lipids. [3] - CORRECT ANSWER-(Crush in)...
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AQA A LEVEL RESPIRATION EXAM QUESTIONS FULLY SOLVED & UPDATED
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Suggest the advantages of the change in blood flow in blood vessels during exercise. [3 marks] - answer--more blood flow to muscles during exercise 
-supplying more glucose and oxygen/ removing carbon dioxide/ lactic acid/ heat 
-for high rate of respiration/ to meet increased demand for energy 
 
Explain how microorganisms contributed to the increase in temperature during processing of organic waste. [2 marks] - answer-respiration produces heat 
 
explain the advantage of showing the data using...
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GED questions with complete solution 2022
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GED questions with complete solution 2022heritable characteristics 
traits linked to DNA that can be passed onto offspring 
 
 
 
3 conditions required for natural selection 
heritable characteristics, variation between traits of individuals, differential fitness between individuals 
 
 
 
differential fitness 
differing ability of individuals to survive, reproduce and pass their genes down to the next generation 
 
 
 
evolution 
genetic change due to change of allele frequency in a population ...
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Reproduction in organisms
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Reproduction enables a species to live generation after generation. Reproduction in organisms can be broadly classified into a sexual and asexual reproduction. Asexual reproduction does not involved the fusion of gametes. It is common in organisms that have a relatively simple organisms such as fungi, algae and some invertebreate animals. The offspring formed by asexual reproduction are identical and can be referred as clones. 
Sexual reproduction involves the formation and fusion of gametes. I...
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Hand written notes biology chapter-Human reproduction
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Providing a chapter of ncert biology, hand written notes are in the document.Everything about chapter and basic knowledge for neet is in the document.Here is summary of this chapter “Reproduction” It is the ability of living organisms to produce a new generation of living individuals similar to themselves. 
“Reproduction events in human” 
Its in 7 stages which should be always written in sequence. 
Gametogeneis=>formation of gametes,i.e. sperms in males and ovum in females known as ga...
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