MULTIPLE CHOICE:$$ Choose the BEST answer from those provided.

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$1.$ Which of the following is a common feature in all cells?

$$ a$)$ has mitochondria$$ b$)$ has a nucleus

$$ c$)$ cytoplasm based on carbon$$ d$)$ contains ribosomes

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$2.$ This factor limits cell size.

$$ a$)$ energy requirements$$ b$)$ osmosis

$$ c$)$ volume$$ d$)$ volume $/$ surface area ratio

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$3.$ Which type of molecule is never found as a component of a cell membrane?

$$ a$)$ carbohydrate$$ b$)$ lipid

$$ c$)$ nucleic acid$$ d$)$ protein

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$4.$ Which of the following is a belt$-$like intercellular junction?

$$ a$)$ desmosomes$$ b$)$ gap junction

$$ c$)$ intergral$$ d$)$ tight junction