QUESTION 1 The glucose transporter, GluT1 transports glucose across the plasma m

Question

QUESTION 1 The glucose transporter, GluT1 transports glucose across the plasma membrane. GluT1 is an example of a oa. lipid-linked protein (e.g. GPl anchored or prenyl group). b. peripheral membrane protein. membrane-associated protein. QUESTION 2 A membrane-spanning region of a transmembrane protein contains the following amino acid sequence: ...Leu-Phe-le-Val-Ala--Gly--Leu--Trp--Va This sequence would likely be found in what type of structure? o a. Double helix. b. Beta barrel. C. Alpha helix. d. Unstructured domain. QUESTION 3 Rank the following molecules from greatest to least permeable across a synthetic lipid bilayer a.steroid hormones, water, glucose, protein hormones .steroid hormones, protein hormones, water, glucose water, glucose, steroid hormones, protein hormones od.glucose, water, steroid hormones, protein hormones

Explanation / Answer

1. D transmembrane protein

It facilitates transport of glucose across the membrane

2. B. Is correct. aromatic reaidues like tyrosine tyrptophan phenlyalalnine and beta branched amnioacids like isoleucine,valine threonine are common .

Alpha helix requires methionine,leucine, alanine and lycine .

3. Opt A is correct.

Steriod hormones are lipid soluble and can easily pass through the membrane. Water is a polar molcule small polar molecules can also be passed through diffusion across cell membrane . But glucose and proteins can not pass easily they requires transporter vechicles or specific signals to pass through.

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