Which of the following amino acids has a positive charge that helps attract DNA to histones?
a) alanine
b) glycine
c) lysine
d) valine
e) serine
Ans: c) lysine
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Which uses synthetic DNA plus DNA cloning techniques to introduce nucleotide changes at specific sites?
a. artificial chromosome synthesis b. ligation c. oligonucleotide replacement d. site-directed mutagenesis
Place the following hypothesized events of the beginning of life in their correct order
I organic polymers form II inorganic molecules form III DNA-based cells form IV organic monomers form V protocells in the RNA world form
a. I, III, V, IV, II b. II, I, IV, V, III c. II, IV, I, V, III d. IV, I, II, III, V e. II, I, IV, V, III
Why is the Lineweaver–Burk plot important in enzyme kinetics?
A) It is a single-reciprocal plot. B) It illustrates enzyme specificity. C) It reveals the presence of prosthetic groups in enzymes. D) It makes it easier to determine Vmax and Km. E) It is nonlinear.
What factors determine the patterns of ocean currents?
What will be an ideal response?