A-Level生物考试课程真题和使用方法推荐

在A-Level生物备考过程中，一定会使用到历年的alevel生物真题，一般来说有真题就一定会有答案，建议大家在备考时可以好好利用一下，那么A-Level生物考试真题长什么样?如何使用ALevel生物真题备考，下面是新航道小编给大家分享的详细内容。

A-Level生物课程是与我们生活关系很密切的科目，alevel生物考试重要知识点主要有：生物化学、细胞生物学、遗传学、生态学、进化学、生理学等，我们先来看一套alevel生物真题。

Instructions

• Use black ink or ball-point pen.

• Fill in the boxes at the top of this page with your name, centre number and candidate number.

• Answer all questions.

• Answer the questions in the spaces provided – there may be more space than you need.

• Show all your working in calculations and include units where appropriate.

Information

• The total mark for this paper is 50.

• The marks for each question are shown in brackets – use this as a guide as to how much time to spend on each question. Advice

• Read each question carefully before you start to answer it.

• Try to answer every question.

• Check your answers if you have time at the end.

Answer ALL questions.

Write your answers in the spaces provided.

1.An investigation compared the protein content of some foods.

Each food was crushed in distilled water to produce a suspension. This was filtered and the liquid filtrate was tested for protein.

(a) (i) Describe how you could test for protein in this filtrate

__________________________________________________________________________________________________________________________

(ii) Describe how the filtrates should have been prepared to allow a valid comparison of the protein content of these foods.

__________________________________________________________________________________________________________________________

(iii) Protein solutions of concentrations from 0.0 to 10.0mgcm−3 were tested using a semi-quantitative method. The results of the test are shown in the diagram.

Describe the difference between a semi-quantitative and a quantitative test.

(iv) Explain how the results shown in the diagram can be used to compare the protein concentrations of food extracts.

__________________________________________________________________________________________________________________________

(b) Another method used to determine the protein content of food is to measure the total nitrogen content. The total nitrogen content is multiplied by a conversion factor to give protein content.

The table shows data for milk and soya beans.

(i) Use the information in the table to calculate the ratio of the protein content of soya beans to that of milk. Give your answer to one decimal place.

Answer ..............................................................

(ii) Some of the total nitrogen content of a food is not due to protein. Give one other type of organic molecule that contains nitrogen.

大家在使用真题备考A-Level生物前，一定要扎实好词汇量，因为alevel生物考试里面有很多深奥的单词，需要大家去记忆。A-Level生物课程真题虽然是备考的必备资料，但最重要的还是平时的积累。