Question

3. Which of these is/are true in DNA replication?

                  1. Helicase produces replications forks.

                  2. New histones are imported into the nucleus shortly after replication is complete.

                  3. DNA polymerase moves along a replication fork, making a new DNA molecules.

                  4. At the completion of replication, two molecules of DNA made from free

                         nucleotides are formed.

               (A) 1 & 3 (B) 2 & 4 (C) 1, 2, 3, (D) 4 only; (E) all of the above

_____ 24. Which of these is/are true about genetics?

                 1. Two homologous chromosomes look alike because they are genetically identical.

              2. Recessive alleles can be expressed in a child only if both parents are carriers.

          3. Males tend to have dominant genes, while females tend to have recessive alleles.

     4. Different forms of a gene at the same locus on homologous chromosomes are called alleles.

              (A) 1 & 3 (B) 2 & 4 (C) 1, 2, 3, (D) 4 only; (E) all of the above

_____ 25. Which of these is/are true?

                 1. Barring mutations, all somatic cells in the body have identical genes.

     2. The backbone of the DNA molecule is made of alternating pyrimidine and purin base pairs.

           3. Mutations in signal peptides can cause disease.

                4. In the synthesis of protein; “X,” 106 amino acids are used; therefore 53 ATP

                      molecules are in used in making “X.”

         (A) 1 & 3 (B) 2 & 4 (C) 1, 2, 3, (D) 4 only; (E) all of the above

Answer 1