True or False? 1). Amino acid Y can be phosphorylated by a kinase. (True ) (Fals
ID: 10769 • Letter: T
Question
True or False?1). Amino acid Y can be phosphorylated by a kinase. (True ) (False)
2). Small GTPases remove phosphate from its target. (True ) (False)
3). Flipase can not promote a flip-flop motion of a membrane protein. (True ) (False)
4). The cytoplasmic side of the integral membrane proteins is rarely glycosylated. (True ) (False)
5). A symport can not function as an antiport even if its orientation in the membrane were reversed. (True ) (False)
6). Portion of a transmembrane protein facing ER lumen will face extracellular side after being targeted to the plasma
membrane. (True ) (False)
7). Translation is a process of generating mRNA. (True) (False)
8). Transcription is a process of generating Proteins. (True) (False)
9). Peptide bond is one of the non-covalent interactions (or bonds) between nucleic acids. (True ) (False)
10). Disulfide bond is one of the covalent bonds between DNAs. (True ) (False)
11). Amphiphatic helices can form a membrane channel. (True ) (False)
12) Hydrogen bond is one of the non-covalent interactions (or bonds) between proteins. (True ) (False)
13). Amino acid E has a polar side chain. (True ) (False)
14). Amino acid F has a polar side chain. (True ) (False)
15). Amino acid T has a polar side chain. (True ) (False)
16). Amino acid V has a polar side chain. (True ) (False)
Explanation / Answer
1) True. "Y" refers to tyrosine, which can be acted upon by tyrosine kinases.
2) True - would help to know more specifics on the 'target' in question though.
3) True - flippases function to promote the flip-flop motion of a phospholipid.
4) False - wouldn't say "rarely"
5) True - a symport by definition moves two substances in the same direction, so if you flipped it the two substances would both be moved in the opposite direction.
6) True
7) False - that's transcription
8) False - that's translation
9) False - peptide bonds are a form of dehydration reaction (ie loss of H2O) in proteins not amino acids. They produce a C---N covalent bond; secondary, tertiary, and quaternary interactions include non-covalent components
10) False - a disulfide bond/bridge is a form of tertiary interaction between the sulfa (SH-) groups of cysteine peptides in a protein chain, not DNA.
11) True - these are membrane spanning components of a transmembrane protein
12) True - a hydrogen bond is an intermolecular attractive force which is part of the secondary protein conformation
13) True - E = glutamic acid (polar)
14) True - F = tyrosine (polar)
15) True - T = threonine (polar)
16) False - V = Valine (nonpolar)
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