25972 questions

When are the conditional and future tenses used in French?

The conditional tense is a tense that is linked to the English "would". It expresses a possible result which relies on a condition. An example of this would be "I would have a lie-in everyday, if I didn't have to go to college." ("Je ferais la grasse matinée tous les jours, si je ne devais pas aller au collège.") In this sentence, we can see that there is a condition to this tense, introduced by "si". The future tense is a tense which explains something that is more certain, with no conditions attached. An example of this would be "Since I don't have lessons tomorrow, I'll have a lie-in." ("Puisque je n'ai pas de leçons demain, je ferai la grasse matinée.") In this sentence, the fact that the speaker will have a lie-in the next day is certain, so they use the future tense which is more certain.
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Thomas S.

Answered by Thomas, French A Level tutor with MyTutor

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Describe the lytic pathway of a virus.

The lytic cycle is one of the two cycles of viral reproduction in host cells. 
Viruses cannot replicate outside a host, therefore virus binds to host cells. Adsorption and penetration occurs (process through which virus inserts genetic material (DNA/RNA) into the host cell. Cellular machinery are used to replicate viral gene and produce more viral genes and proteins. 
The components assemble into new viral particles. The newly formed viruses can exit the cell either via the host cell membrane or lysis of the host cell. These viruses can further undergo reproduction in other host cells, resulting in more virus particles. Thus, can spreading infection.
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Nisha G.

Answered by Nisha, Biology GCSE tutor with MyTutor

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Maltose is hydrolysed by the enzyme maltase. Explain why maltase catalyses only this reaction (3 marks)

The question is three marks, so should have three points.
1) Active site of the enzyme has a specific shape/ tertiary structure/ complementary to maltose
2) Only maltose can bind/ fit
3) Forms an enzyme-substrate complex
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Amy W.

Answered by Amy, Biology A Level tutor with MyTutor

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Define an isotope.

Compounds with the same molecular formula but have different structural formulas.
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Shivani S.

Answered by Shivani, who has applied to tutor Chemistry GCSE with MyTutor

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Solve 3(2y - 1) = 6

Expand bracket 6y - 3 = 6
Collect like terms6y = 6 + 36y = 9y = 9/6
Simplify answer y = 3/2 (1.5)
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Shivani S.

Answered by Shivani, who has applied to tutor Maths GCSE with MyTutor

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Describe how a vaccine results in the production of antibodies against a disease causing organism.

The vaccine contains parts of the pathogen that are recognised by the immune system, these are called antigens. The antigen is recognised by innate immune cells such as macrophages that will engulf the pathogen and express the antigens on its surface. This will then prime cells of the adaptive immune system that have a specific receptors for the antigen, this includes T and B cells. T cell stimulation is required to activate B cells. Once activated B cells will secrete a soluble form of their receptor called antibodies in large amounts. Antibody secreting B cells are called plasma cells. 
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Anna C.

Answered by Anna, Biology A Level tutor with MyTutor

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Use factorisation to simplify the following expression (x^2-9)/(x^2-4x+3)

we simplify the top and bottom of the fraction separately.
x^2-9 factorises to (x+3)(x-3) using the difference of two squares.
x^2-4x+3 factorises to (x-1)(x-3).
So the above formula simplifies to (x+3)/(x-1)

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Jack L.

Answered by Jack, Maths GCSE tutor with MyTutor

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How do I plan and structure this question?- "To what extent was the destruction of the kulaks the most important outcome of Stalin’s campaign of forced collectivisation?" (AQA A-Level History, Revolution and dictatorship: Russia, 1917-1953, June 2018)

Firstly, we need to highlight the key words here: EXTENT, KULAKS, MOST IMPORTANT, COLLECTIVISATION. The question is asking you 'to what extent' were the Kulaks the MOST IMPORTANT factor. Remember to always link your point back and answer the question! Remember the three key elements when answering an essay question:
(P) POINT- this should outline your first key point that you are trying to make.(E) EVIDENCE- this should support your initial point using examples and historiography if necessary.(E) EXPLANATION AND SIGNIFICANCE- why is this point important? How does it answer the question? Remember to relate the theme/ point back to the question. In other words, make sure you are answering the question!
Here is an example of a paragraph using P.E.E.-
(P)- The destruction of the kulaks played a significant role in the outcome of Stalin's campaign of forced collectivisation due to the assosciation of the Kulaks with Capitalism.(E)- Stalin required the Kulaks to be exiled to places such as the Gulags in order to establish a long-lasting stable regime which developed the long-term socialism goal in which he needed to achieve.This is supported by Fitzpatrick who stresses the urgency of the USSR's need for fully achieved socialism after the abandoment of NEP (New Economic Plan).(E)- This is significant because the Kulaks represented a Capitalist culture which being a threat to the Communist doctrine enabled Stalin to excercise the monopoly of authority from the Centre onto the process of collective farming as opposed to previously instilled individual farming. The outcome of the destruction of the Kulaks had a significant influence in the prevailment of collective farming on the peasants to a large extent.
Now repeat for all your other points, for example: economic progress, foreign policy...etc!
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Perri R.

Answered by Perri, who has applied to tutor History A Level with MyTutor

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