Name the semifluid paste of food particles and gastric juice.

Give the systematic name of the the disaccharide shown below: CH2OH CH2OH H H Н ОН Н Н ОН Н H H ОН H. ОН H ОН

This test will differentiate between aromatic amino acids with an acitivated ring from other amino acids. a) Nihydrin Test b) Xanthoproteic Test C) solubility test d) polarimeter test

(a) What is the charge of bile acids in the small intestine, where the pH is 7–8? (b) According to one hypothesis, bile acids are toxic to bacteria and so could help limit their growth in the intestine. Propose a mechanism for this bactericidal activity.

When cross sectional area of the head group and acyl side chain is similar, which of the following lipid aggregates formation is favored?a) Micellesb) Bilayerc) Liposomed) Myelin sheath

The five-digit code for all members of the family Enterobacteriaceae starts with the number 2 or 3. What does this indicate about their common biochemistry?

RNAses can be found a) In cells b) Countertops c) On hands d) Everywhere The ratio of absorption at 260nm to absorption at 280nm is commonly used to assess a) The concentration of DNA and RNA. b) The purity of protein. c) Whether your DNA or RNA is contaminated Trizol. d) The concentration of protein in your sample.

SDS coats proteins with a: A) Positive Charge B) Negative Charge

there is a cellular sack that is impermeable to starch molecules and is filled with a solution, comprised of 20% starch. it is placed in a container of 100% distilled water?  a) what term descibes the solution in the sack compared to the solution surronding it? i) hypertonic ii) hypotonic iii) isotonic b) in which direction will the water molecules move faster? i) into the cell ii) out of the cell iii) same in both iv) not at all c) in which direction will the starch molecules move? i) into the cell ii) out of the cell iii) same in both iv) not at all  i'm stuck on this hw question. i think the answers are a) hypertonic, b) out of the cell, and c) not at all. but i'm not sure if those are correct and need clarification on this, thank you!

What reagent present in the protein sample buffer is important for breaking disulfide bonds? a) 2-mercaptoethanol O b) chloride ions O c) glycine O d) SDS