Question

1. the backbone for steroid hormones is

a) skittles
b) amino acid
c) cholesterol
d) glucose

1. for nuclear receptor activation

a) dimerization of activated nuclear - receptors must occur
b) direct capture of activated nuclear - receptors by plasma membrane
c) alteration of the ligand - binding domain
d) plasma membrane depolarization
e) 2nd messenger production

1. living plasma membrane receptors, all of the following except usually occurs

a) the signal is not amplified intracellularly
b) intracellular signals are eventually terminated
c) a second messenger is used intracellularly
d) protein translation is ultimately affected
e) a number of enzymes are activated

1. general types of signal transducers include all except

a) receptor enzymes
b) spontaneous protein transcription and translation
c) gated ion channel
d) trans - membrane (serpentine) receptors
e) steroid (nuclear) receptors

1. ________ is responsible for follicular maturation, and is therefore associated with the steroid hormone

a) fsh; estrogen
d) fsh; lh
b) lh; progesterone
e) gnrh; testosterone
c) lh; oxytocin

1. we said that the type of enzymes responsible for converting cholesterol of steroid hormones are ________ enzymes

a) \saucey\
b) ribosomal
c) cytochrome p450
d) thermogenic
e) idiopathic

Explanation:

1. The backbone for steroid hormones is cholesterol.
2. For nuclear receptor activation, dimerization of activated nuclear receptors usually must occur.
3. When using plasma membrane receptors, protein translation is ultimately affected, a number of enzymes are affected, a second - messenger is used intracellularly, and cellular signals are eventually terminated. Intracellular signal amplification usually occurs, so the exception is that the signal is not amplified intracellularly.
4. General types of signal transducers include receptor enzymes, gated ion channels, trans - membrane (serpentine) receptors, and steroid (nuclear) receptors. Spontaneous protein transcription and translation is not a type of signal transducer.
5. Follicle - stimulating hormone (FSH) is responsible for follicular maturation and is associated with estrogen.
6. Cytochrome P450 enzymes are responsible for converting cholesterol to steroid hormones.

Answer:

1. c
2. a
3. a
4. b
5. a
6. c