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TLS Online TPP Program

#Question id: 378

Which of the following statements about buffers is true?

#1. Molecules and their Interaction Relevant to Biology

  1. A buffer composed of a weak acid of pKa = 5 is stronger at pH 4 than at pH 6.

  2. At pH values higher than the pKa, the salt concentration is higher than that of the acid.

  3. The strongest buffers are those composed of strong acids and strong bases.

  4. When pH = pKa, the weak acid and salt concentrations in a buffer are equal.

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TLS Online TPP Program

#Question id: 3892

#3. Fundamental Processes

The DNA binding motif for many prokaryotic regulatory proteins, such as the lac repressor, is:
TLS Online TPP Program

#Question id: 11075

#7. System Physiology – Animal

A 65-year-old man with emphysema due to 34 years of cigarette smoking is admitted to hospital due to dyspnea. With further tests the mean pulmonary arterial pressure is determined to be 45 mm Hg at rest. He is hypoxic (PO2 = 49 mm Hg), hypercapnic (85 mm Hg), and slightly acidotic. The cardiovascular and oxygen changes are due to which of the following?
TLS Online TPP Program

#Question id: 15705

#12. Applied Biology

IAA or IBA auxins alone or in combination with a low concentration of cytokinin are important in the induction of
TLS Online TPP Program

#Question id: 20712

#12. Applied Biology

In electron transfer process usable energy is recovered through which reactions and forms energy storage compounds or electrochemical gradients
TLS Online TPP Program

#Question id: 10744

#10. Ecological Principles

Something that triggers a fixed action potential (FAP) is considered to be a(n) _____________.