You are studying a protein that you call Protein X. There is an aspartic acid at a key position in Protein X which is important in the folding and stabilization of that protein
If this aspartic acid is changed to a different amino acid, which one of the following amino acid substitutions is most likely to allow the protein to fold normally?
A. threonine
B. glycine
C. arginine
D. glutamic acid
E. serine
Answer: D
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resins. b. hormones. c. starches. d. enzymes. e. nectar
DNA attains a secondary structure when hydrogen bonds form between the nitrogenous bases called purines and pyrimidines. What are the complementary base pairs that form in DNA?
a. A-T and G-C b. A-U and G-C c. A-G and T-C d. A-T and G-U
A cell with the ability to differentiate into several different types of cells is considered ________
A) multipotent B) unipotent C) totipotent D) pluripotent
Guard cells are responsible for:
A) regulating passage of carbon dioxide into the leaf. B) protection of a leaf. C) photosynthesis. D) transport of water and minerals.