Phytoplankton and zooplankton are divisions of the plankton. The phytoplankton comprehends the autotrophic floating beings: algae and cyanobacteria. The zooplankton is formed by the heterotrophic planktonic beings: protozoans, small crustaceans, cnidarians, larvae, etc.
Lysosomes of the cell are where A) lysozyme is synthesized. B) secretory proteins are transported to the surface. C) endocytosed material is degraded. D) glycogen is stored as an energy source
Which of the following is NOT a mechanism for a cell to degrade its own cytosolic proteins? A) Autophagic vacuoles B) Phagocytosis and secondary lysosome fusion. C) 26S Proteosome degradation. D) All the above are correct mechanisms
Colchicine treatment of cells to disrupt microtubules can result in A) loss of cell shape B) loss of directional movement. C) loss of nutrient transport. D) all of the above
The cytoplasmic matrix is best described as A) A dilute aqueous solution that fills most of the cell. B) A solution of inorganic salts intended to balance osmotic pressure in the cell. C) A semicrystalline mixture mostly of proteins and bound water molecules. D) Material in transit between membrane bound organelles
When Listeria monocytogenes invades a eucaryotic cell, it secretes the ActA protein that A) polymerizes actin filaments, causing the bacterium to move through the cytoplasm. B) depolymerizes microfilaments, allowing the bacterium to move more easily in the cytoplasm. C) degrades the cytoskeleton, allowing the bacterium to travel through the plasma membrane to adjacent cells. D) attaches to microtubules, allowing the bacterium to move along the fibers
The mitochondria is the site of A) protein synthesis B) lipid synthesis C) energy production
Which of the following statements about Endoplasmic reticulum (ER) is not true? A) ER can transport proteins and lipids to the plasma membrane or for secretion. B) ER is the main site for cell membrane biosynthesis. C) ER is contiguous with the nuclear membrane. D) ER is the main site for synthesis of cytoplasmic proteins
The diploid state of a microorganism refers to the times when cells contain _______ copy (ies) of each chromosome and occurs after mitotic cell division. A) one B) two C) three
Negative stains color the structures of interest a deep black. A) True B) False
Bacterial flagella are too small to be seen by light microscopy without staining the specimen. A) True B) False
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