PLease help me with these questions and if possible provide me the explanations also

1)Which one of the following functional group are essential for a substance to act as a amphipathic(ampiphillic)molecule

a.Polar,nonpolar
b.polar ,negatively charged
c.nonpolar, positively charged
d.cyclic,hydrophillic
e.branched,hydrphillic

2)Reduced serum potassium might produce which of the following results?

a.Reduced membrane threshold potential
b.elevated membrane threshold potential
c.hyperpolarized cell membrane potential
d.hypopolarized cell membrane potential
e.hyperactive neuromuscular reflexs

Thanx

Couple of more questions:

3)During oxidative phophorylation the hydrogen ion gradient is created using energy from which of the following?

a.ADP transport
b.ATP synthesis
c.ATP hydrolysis
d.Reduction of NAD+
e.Electron transfer

4) Initially the developing heart is

a.induced by the notochord
b.positioned posterior to the notochord
c.positioned anterior to the prochordal plate
d.between prochordal plate and the notochord

5)Which part of the root has the thickest layer of cementum?

a.exposed root surface
b.apical third of the root
c.middle third of the root
d.coronal third of the root

6)the nerves of the anterior abdominal wall lie immediately deep to which layer of the wall?

a.external oblique muscle
b.internal oblique muscle
c.transverse abdominis
d.transversalis fascia
e.peritoneum

PLease help me with these questions and if possible provide me the explanations also

1)Which one of the following functional group are essential for a substance to act as a amphipathic(ampiphillic)molecule

a.Polar,nonpolar
b.polar ,negatively charged
c.nonpolar, positively charged
d.cyclic,hydrophillic
e.branched,hydrphillic

2)Reduced serum potassium might produce which of the following results?

a.Reduced membrane threshold potential
b.elevated membrane threshold potential
c.hyperpolarized cell membrane potential
d.hypopolarized cell membrane potential
e.hyperactive neuromuscular reflexs

Thanx
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