The taxonomic subdivision immediately below the level of a kingdom is a
A. phylum.
B. family.
C. genus.
D. order.
A. phylum.
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Answer the following statements true (T) or false (F)
1. In eukaryotes, most proteins contain short stretches of amino acid sequences called sorting signals which direct the protein to the correct cellular location. 2. The first step in cotranslational sorting occurs when the peptide is directed to the endoplasmic reticulum. 3. Chaperones keep proteins destined for the mitochondrial matrix in their three dimensional active structure. 4. Freeze fracture electron microscopy allows one to observe the two-dimensional cross section of membrane proteins.
A plant that undergoes temporal separation of the steps of photosynthesis is administered a
drug that prevents the stomata from opening at night. What effect will this have on the plant?
a. It will have no effect. b. The light reactions will take place, but the Calvin cycle will not. c. The light reactions will not take place, but the Calvin cycle will. d. Both parts of photosynthesis will not take place.
The base of the food web in the open ocean and the bottom beneath the open ocean is:
a. algae. b. seagrasses. c. chemosynthetic bacteria. d. phytoplankton. e. detritus.
What is the most common cause of a miscarriage?
a. cervical incompetence b. genetic disorders of the embryo or fetus c. infections d. trauma e. malnutrition of the mother