Which cell organelle is the site of protein synthesis?

Here are the solutions to the questions:

1) Which cell organelle is the site of protein synthesis?

• C) Ribosome Ribosomes are responsible for synthesizing proteins from amino acids based on mRNA templates.

2) Identify a characteristic feature of mammals.

• A) Presence of mammary glands Mammary glands are a defining characteristic of mammals, used to produce milk for their young.

3) Active transport differs from simple diffusion and osmosis in that it requires:

• C) Energy in the form of ATP. Active transport moves substances against their concentration gradient, which requires energy, typically supplied by ATP. Simple diffusion and osmosis are passive processes that do not require cellular energy.

**4) Blood is classified as which type of tissue?