Question

In the evolution of the skeleton, release of collagen by specialized amoebocytes and followed by the release CaCO₃ by amoebocytes cells first appears in the collagen skeletal matrix formed by：a) the sponge, b) prokaryotes, c) Osteocytes of the Boney fishes, d) Adipose cells, e) Neuocytes of the chordates.

In the evolution of cell specialization, the molecule ATP is important because it:

a) supplies energy needed to synthesize macromolecules within the cell.

b) supplies energy required to pump substances across the plasma membranes.

c) is the energy source for neurocytes to synthesize inducers and suppressors of genes in other cells.

d) provides energy that causes molecules to change shape, e) All of the choices are correct.

As eukaryotic cells become more specialized, the nucleus is NOT important as the site of:

a) DNA synthesis. b) synthesis of muscle protein, c) DNA mutation, d) changes in the regulation of genes, e) synthesis of m RNA

Various types of stem cells that develop from the mesoderm are involved in processes by which cells obtain or regulate ions, molecules or monomers (nutrients). Therefore, they perform which of the following processes? a) Osmosis, b) active transport, c) facilitated diffusion, d) exocytosis, e) all are correct.

a

Answer 1

In the evolution of the skeleton, release of collagen by specialized amoebocytes and followed by the release CaCO3 by amoebocytes cells first appears in the collagen skeletal matrix formed by：

a) the sponge, b) prokaryotes, c) Osteocytes of the Boney fishes, d) Adipose cells, e) Neuocytes of the chordates.

Answer: Option a - Spoge (Phylum Porifera)

In the evolution of cell specialization, the molecule ATP is important because it:

a) supplies energy needed to synthesize macromolecules within the cell.

b) supplies energy required to pump substances across the plasma membranes.

c) is the energy source for neurocytes to synthesize inducers and suppressors of genes in other cells.

d) provides energy that causes molecules to change shape,

e) All of the choices are correct.

Answer: Option e - All are correct

As eukaryotic cells become more specialized, the nucleus is NOT important as the site of:

a) DNA synthesis. b) synthesis of muscle protein, c) DNA mutation, d) changes in the regulation of genes, e) synthesis of m RNA

Answer: Option b - Synthesis of musckle protein (or any protein - translation) occurs in the cytoplasm in eukaryotic cells.

Various types of stem cells that develop from the mesoderm are involved in processes by which cells obtain or regulate ions, molecules or monomers (nutrients). Therefore, they perform which of the following processes?

a) Osmosis, b) active transport, c) facilitated diffusion, d) exocytosis, e) all are correct.

Answer: Option e - all are correct.