Question

27. Where do enzymes come from? a. enzymes are a type of protei so they come from ribosomes b. enzymes are a type of protein so they come from the nucleus c. enzymes are segments of DNA d. enzymes are catalysts so they never break dowr 8. According the DNA model below, which fact is NOT being represented correctly a. DNA is composed of six different subunits(or smaller molecules) b. DNA consists of two chains that are bonded together. A subunit from one strand bonds to a subunit on the other. c. The diameter of DNA is the same along its entire length. d. A sugar subunit can only bind with two other subunits: a base subunit and a phosphate group subunit. 29. Examine the chart below: Relative proportions (%) of bases in DNA Organism Human Chicken Grasshopper 29.3 29.3 20.5 20.7 Sea urchin Wheat Yeast E. coli A?T 30.9 29.4 19.9 19.8 28,8 i 29,21 20,5 21.5 328 32.1 1 173 273 271 22.7 22.8 313 329 18.7 171 24.7 23.6 26.0 25.7 What can you conclude? a. Humans have more G and C b. The ratios of A, T, G, and C are the same for all animals c. Chicken and Grasshoppers are related because the ratios are the same d. "A" most likely matches with "T" because the % are about the same for all organisms

Answer 1

27. Option A is correct.
Enzymes are biocatalysts. They are proteins derived from the translation of mRNA which is mediated by ribosomes.

28. Option B is correct.
DNA is composed of nucleotides (Sugar+base+phosphate). There are four different bases (ATGC) found in DNA (So, total six different molecules). In the given image, the bases are not represented properly.

29. Option D is correct.
A pairs with T via two H-bonds.
G pairs with C via three H-bonds.