1 DNA is found only in the nucleus of a cell a DNA is found

1) DNA is found only in the nucleus of a cell.

a) DNA is found not only in the nucleus of a eukaryotic cell but also in the ribosomes and, if present, in the vacuoles.

b) DNA is found not only in the nucleus of a eukaryotic cell but also in the mitochondria and, if present, in the vacuoles.

c) DNA is found not only in the nucleus of a eukaryotic cell but also in the mitochondria and, if present, in the chloroplasts.

d) DNA is found not only in the nucleus of a eukaryotic cell but also in the ribosomes and, if present, in the chloroplasts

2) Because bacterial cells have no organelles, they cannot carry out either synthesis or photosynthesis.

a) Bacteria do not have organelles but carry out either ATP synthesis or photosynthesis using the plasma membrane.

b) Bacteria do not have organelles but carry out either ATP synthesis or photosynthesis using the mitochondria.

c) Bacteria do not have organelles but carry out either ATP synthesis or photosynthesis using the cytosol.

d) Bacteria do not have organelles but carry out either ATP synthesis or photosynthesis using the free enzymes.

Solution

Answer 1. Option c is correct. In animal cell dna found only in nucleus and mitochondria. In plant cell dna present in nucleus,mitochondria as well as in chloroplast. Ribosomes have only rna.

Answer 2. Option d is correct. Bacteria do not have membrane bound organelles. But carry out photosynthesis and ATP using free enzyme which have characteristic of chorophyll, these enzymes usually called pigments found attached to membrane and cytosol.