1. [1 mark]
In mammals, mature red blood cells are specialized in that they lack
nuclei, mitochondria or ribosomes. Which statement applies to red blood
cells?
A No chemical reactions take place within their cytoplasm.
B. They cannot produce new enzymes.
C. Materials cannot enter red blood cells.
D. Materials cannot exit red blood cells.

{answer found. it's (3 ) }which statement describes the cell cycle? (1)the cell cycle is a process in which one cell divides into four genetically different cells. (2)the cell cycle is a process in which one cell divides into two genetically different cells. (3)the cell cycle is a process in which one cell divides into two genetically identical cells. (4)the cell cycle is a process in which one cell divides into four genetically identical cells.

Knowing the importance of the essential elements, why would someone chose a diet that does not address all of them?

16. which of the following accurately describes a step within transcription? a. dna polymerase uses one strand of rna as a template to put together nucleotides. b. the dna strand is used as a template for which a complementary rna strand can be produced. c. the rna strand forms a template by which dna can be built. d. the rna strand is produced within the cytoplasm.