Question

QUESTION 54 Magnesium has 12 protons. How many electrons are in its first energy level a. 8 Ob.6 OOO ud QUESTION 55 Suppose a RNA is carrying the amino acid valine. What is its anticodon? a.AUA O b. CGC Oc. CÁC Od.GGU Oe.CUC QUESTION 56 When a cell has two complete sets of chromosomes, it is a. triploid Ob.complete O c. diploid O d. haploid e duplicated

Answer 1

54. C. 2

Magnesium has 2 electrons in its first energy level because it contains one orbital ( 1s orbital) . It's electronic configuration is 2:8:2 . That is 2 electrons in first energy level ,8 electrons in second energy level and 2 electrons in third energy level.

55. C. CAC

The codon for valine will start with GU ( GUU,GUC,GUA,GUG) so the anticodon will be complementary to those sequences so It will start with CA ( CAU,CAC,CAA,CAG) .

56. C. Diploid

One complete set of chromosomes are called haploid .Two complete set of chromosomes are called diploid.( 46 chromosomes in humans) .