Question

question 3
the membranous organelle that contains the majority of the dna in a cell.
a nucleus
b chloroplast
c mitochondria
d golgi apparatus
e rough endoplasmic reticulum
f smooth endoplasmic reticulum
question 4
the chloroplast are found in___.
a plant and animal cells.
b plant cells.
c animal cells only.
d plant, animal, and prokaryotic cells (bacteria)

Explanation:

Question 3

To solve this, we analyze each option:

• Option A: The nucleus is a membranous organelle and contains the majority of a cell's DNA (in the form of chromosomes).
• Option B: Chloroplasts contain some DNA (chloroplast DNA) but not the majority of the cell's DNA.
• Option C: Mitochondria contain mitochondrial DNA, but it's a small portion compared to the nucleus.
• Options D, E, F: Golgi apparatus, rough ER, and smooth ER do not contain DNA.

So the correct answer is the one with the nucleus.

Analyzing each option:

• Option A: Animal cells do not have chloroplasts (they don't perform photosynthesis).
• Option B: Chloroplasts are organelles responsible for photosynthesis, and they are found in plant cells (and some algae) since plants need to photosynthesize.
• Option C: Animal cells lack chloroplasts.
• Option D: Animal and prokaryotic (bacterial) cells do not have chloroplasts.

Thus, chloroplasts are found in plant cells.

Answer:

A. Nucleus

Question 4