Bacteria living in salt marshes are most likely which of the following?
A. acidophiles
B. barophiles
C. halotolerant
D. thermophiles
Answer: C. halotolerant
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The cyst form of Balantidium coli is the infective stage. It has one large kidney-shaped macronucleus and one small, round micronucleus. The troph is quite large, measuring 50 to 150 µm in length and 40 to 70 µm in width. What single feature is associated with this organism?
a. Falling leaf motility b. Shepherd's crook c. Presence of oocytes d. Cilia covering the troph
The fluid mosaic model proposed by Singer and Nicolson in 1972 explained that
A. the cell membrane was composed of a phospholipid bilayer but the polar ends of the phospholipid molecules were reversed. B. the cell membrane was composed of a phospholipid bilayer between two layers of globular proteins. C. the cell membrane was composed of lipids and proteins. D. the cell membrane was composed of a phospholipid bilayer with globular proteins actually inserted into the bilayer.
A scientist is studying some developing eggs from an ocean sample. The early embryos have divided only a few times, and all cells look identical. When the scientist carefully removes half the cells from an embryo, both clumps of cells are able to complete development, forming twins. The eggs can be identified as
A. deuterostomes. B. protostomes. C. cnidarians. D. crustaceans. E. echinoderms.
Which of the following organelle is not part of the endomembrane system?
A. endoplasmic reticulum B. Golgi apparatus C. lysome D. peroxisome