A group of membrane proteins can be extracted from membranes only by using detergents
All the proteins in this group have a similar amino acid sequence at their C-terminus: -KKKKKXXC (where K stands for lysine, X stands for any amino acid, and C stands for cysteine). This sequence is essential for their attachment to the membrane. What is the most likely way in which the C-terminal sequence attaches these proteins to the membrane?
(a) The cysteine residue is covalently attached to a membrane lipid.
(b) The peptide spans the membrane as an ? helix.
(c) The peptide spans the membrane as part of a ? sheet.
(d) The positively charged lysine residues interact with an acidic integral membrane protein.
(a)
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This chapter discussed speciation by genetic divergence following geographic isolation, which is expected to lead to reduced gene flow, a process known as allopatric speciation
A more controversial form of speciation is the genetic divergence of populations without physical isolation, a process known as sympatric speciation. Can you envision a mechanism or process that would permit two coexisting populations of the same species to begin to diverge without being isolated from one another?
What are the four classes of large organic molecules important to life on Earth?
A) Carbohydrates, lipids, proteins, and enzymes B) Carbohydrates, lipids, proteins, and sugars C) Carbohydrates, proteins, nucleic acids, and sugars D) Carbohydrates, proteins, lipids, and nucleic acids
Peas and beans are considered legumes. Why?
What will be an ideal response?
What is the path of urine from formation to excretion in the mammalian kidney?
A. collecting duct ? ureter ? urinary bladder ? renal pelvis ? urethra B. collecting duct ? renal pelvis ? ureter ? urinary bladder ? urethra C. ureter ? collecting duct ? renal pelvis ? urinary bladder ? urethra D. urethra ? collecting duct ? renal pelvis ? ureter ? urinary bladder E. renal pelvis ? ureter ? urinary bladder ? urethra ? collecting duct