In the cell,digestive enzymes are mostly found in:

At which $pH$ are lysosomal enzymes typically active?

Which sentences are correct for lysosomes?
$1-$ It is a suicidal bag.
$2-$ It possesses one layer.
$3-$ It is a self-replicating organelle.
$4-$ It contains hydrolase type of digestive enzymes.
$5-$ It is always seen near the nucleus.
$6-$ It plays an important role in phagocytosis and pinocytosis.
$7-$ It is present in animal cells and also in plant cells.

Which cellular organelle is important in the processes of phagocytosis (cell eating) and pinocytosis (cell drinking)?

$A$ : Lysosomes help in the digestion of foreign particles in animal cells.
$R$ : They have respiratory enzymes.

Which one of the following cell organelles is enclosed by a single membrane?