According to Chargaffʹs observations of nucleotide composition of DNA samples, which of the following options are correct

A) % of (G + C) + % of (A + T) = 100%.

B) A = T.

C) G = C.

D) %A + %C + %T = 100%.

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#Question id: 2144

#Section 2: General Biology

The type of membrane transport that uses ion gradients as the energy source is:

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#Question id: 2145

#Section 2: General Biology

An electrogenic Na+ transporter:

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#Question id: 2146

#Section 2: General Biology

In one catalytic cycle, the Na+/K+ ATPase transporter transports:

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#Question id: 2147

#Section 2: General Biology

Movement of water across membranes is facilitated by proteins called:

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#Question id: 2148

#Section 2: General Biology

The specificity of the potassium channel for K+ over Na+ is mainly the result of the:

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#Question id: 2149

#Section 2: General Biology

A ligand-gated ion channel (such as the nicotinic acetylcholine receptor) is: