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Radiolaria and diatoms have a shell of_______ .
a. cellulose c. calcium carbonate
b. silica d. chitin
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- The first forms of life on Earth were thought to be_____. a. single-celled plants b. prokaryotes c. insects d. large animals such as dinosaursPhotosynthetic protists with shells composed of two halves that fit together like a petri dish are (a) golden algae (b) diatoms (c) euglenoids (d) brown algae (e) foramsBiologists at NASA are studying new life forms found in the arctic and have collected an unknown specimen that appears to have a cell membrane, ribosomes and mitochondria. This specimen could be… a.a bacterium b. a virus c. an archaeon d. any one of the above e. a eukaryote
- Virusesa. are usually photosynthetic.b. consist of a single cell.c. consist of DNA or RNA and a protein coat.d. consist of ATP and a lipid coat.Both archaea and eukaryotes have______ . a. peptidoglycan c. a nucleus b. histone proteins d. a capsidBacteria that cause the disease typhus are close relatives of bacteria that evolved into _____. a. Protists b. Protocells c. chloroplasts d. mitochondria Among prokaryotes, only the cyanobacteria ______. a. Live near hydrothermal vents b. Produce oxygen during photosynthesis c. Cannot tolerate oxygen d. Have a nucleus-like structure
- Which of the following does not possess cilia or flagella? a.)Amoeba b.)Paramecium c.)Trypanosoma d.)MastigamoebaYou have discovered a photosynthetic protist that lives in fairly deep water (for example, 250 m deep). To which of the following groups should this organism be classified? A. diatoms B. green algae C. red algae D. cercozoanA meristematic cells a. Are dead b. Have a high cytosol/nucleus ration c. Have a few proplastids d. Have lignified cell walls
- Amoebas, foraminifera, and radiolarians move using theira. cytoplasm.b. flagella.c. cilia.d. setae.Bacteria are similar to archaea in that theya. arose through endosymbiosis.b. are multicellular.c. live in extreme environments.d. are prokaryotes.A principle of biology is that biology affects our society. Whyare the cysts of protists important to epidemiologists, thebiologists who study the spread of disease?