Multiple choice

Ciliates differ from all other protozoans in

  1. capturing prey with pseudopodia

  2. having two types of nuclei

  3. not using flagella for locomotion

  4. having contractile vacuoles
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ciliates have two different sorts of nuclei: a small, diploid micronucleus (reproduction), and a large, polyploid macronucleus (general cell regulation). The latter is generated from the micronucleus by amplification of the genome and heavy editing. The micronucleus serves as the germ line nucleus, but does not express its genes. The macronucleus provides the nuclear RNA for vegetative growth.

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