Question

Help me in science only no 12

Answer 1

Certain key genes are made at all times under all circumstances. – E.g. Ribosomal proteins, tRNAs, RNA polymerase, glycolysis enzymes – These are called constitutive genes. Other genes are made only at certain times or in certain conditions so YES

Answer 2

No, not all genes are constantly expressed. Genes are turned on and off depending on the specialty of the cells.