which of these structures contains RNA but not DNA?
mitochondrion
ribosome
nucleus
chloroplast
what is the function of the Golgi apparatus?
to synthesise ATP
to make proteins from amino acids
to aid endocytosis
to make secretory products
what is the name of the structures which penetrate the walls of adjacent plant cells?
plasmodesmata
middle lamellae
pits
channels
cells in a culture will absorb amino acids from the surrounding culture medium. If radioactively labeled glycine is provided in the culture medium, in which organelle will radioactivity be found first?
ribosomes
lysosomes
Golgi apparatus
what resolution does a light microscope have?
20μm
2μm
0.2μm
0.02μm
which of these cell structures does not have an envelope?
lysosome
what are observable "brush borders" found on intestinal epithelial cells?
cilia
villi
microvilli
flagella
which of the following is concerned with the synthesis and transport of lipids and steroids in the cell?
rough ER
smooth ER