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Why would a patient with no helper T cells not produce any antibodies?

This is because helper T cells are required to cause the proliferation of plasma B cells that produce antibodies once they recognise the antigen on an antigen presenting cell as harmful.
Answered by • Human Biology tutor
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Explain the concept of collective responsibility in relation to the UK cabinet

Collective responsibility is the concept that members of the cabinet cannot pubically disagree with the decisions of the cabinet and must agree and support any decisions made.
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A buffer solution was formed by mixing 20.0 cm^3 of sodium hydroxide solution of concentration 0.100 mol dm^–3 with 25.0 cm^3 of ethanoic acid of concentration 0.150 mol dm^–3. CH3COOH + NaOH---CH3COONa + H2O Calculate the pH of this buffer solution.

Ka for ethanoic acid = 1.74 × 10–5 mol dm –3 also given in question. moles = concentration x volume / 1000Ka = [H+] [A-]/[HA]pH = -log [H+] initial moles:NaOH: 20x0.1/1000 = 0.002molCH 3 COOH: 25 x 0.15 / 10...
Answered by • Chemistry tutor
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How do I approach analysing an unseen poem?

The very first thing you need to do is purely read it through in order to get an understanding of the poem. I'd recommend not even trying to think too technically at this point, but rather notice what effect...
RL
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Deine deutsche Freundin hat dir eine Postkarte geschrieben. Sie hat dich gefragt wo du gerne in den Urlaub fahren möchtest. Beschreibe was dein Traumurlaub wäre, wieso du gerne dahin fahren möchtest und was du dort machen würdest.

Am liebsten würde ich nach Egypten fahren, weil ich in meinem Leben noch nie eine Pyramide gesehen habe. Die egyptische Kultur und Geschichte finde ich auch fascinierend. Meine große Schwester zieht nächstes...
KR
Answered by Katherine R. • German tutor
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