When performing 2-D gel electrophoresis, what is the purpose of exposing the proteins to sodium dodecyl sulfate (SDS)?
A. SDS masks all of the proteins' native charge with a positive charge.
B. SDS masks all of the proteins' native charge with a negative charge.
C. SDS makes all of the proteins' the same molecular weight.
D. SDS adds a hydroxyl group to amino acid residues on each of the proteins.
E. SDS masks all of the proteins' native charge with a neutral charge.
B. SDS masks all of the proteins' native charge with a negative charge.
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What occurs during the absorptive period? Check all that apply.
_____ Glucose absorption from the gut is high. _____ Glucose utilization by cells is high. _____ Fat utilization by cells is high. _____ Synthesis of triglycerides is high. _____ Breakdown of glycogen is low.
In some cases, when an insect begins feeding on a leaf the plant responds by activating a signaling
pathway that results in the production of ____, which disrupt an insect's capacity to digest proteins.
a. gibberellins b. lipases c. chitinases d. protease inhibitors e. cytokinins
Were there any eukaryotic cells on Earth 1.5 billion years ago?
A) Yes, they first appear in the fossil record around 3.5 billion years ago. B) Yes, they first appear in the fossil record around 2 billion years ago. C) No, they do not appear in the fossil record until around 1 million years ago. D) No, they do not appear in the fossil record until around 500 million years ago.
Extraembryonic membranes are NOT found in the development of
Select one: a. amphibians. b. reptiles. c. birds. d. mammals. e. chordates.