Which stem variation is fleshy and will grow underground parallel to the soil surface?
a. Bulb
b. Tuber
c. Cladophore
d. Rhizomes
e. Stolons
d
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During inflammation, receptors on ________ will bind to the antigen
a. platelets b. red blood cells c. erythrocytes d. eosinophils e. basophils
Gene sequences that evolve at a constant rate can be used to
a. index the time of divergence between two species. d. index the number of extinct species within a lineage. b. calculate speciation rates across lineages. e. calculate extinction rates across lineages. c. calculate speciation rates within different lineages.
LHON is a mitochondrial disease caused by weak hypomorphic mutations that affect the mitochondrial electron transport chain. Among the first symptoms of the disease is blindness. People with LHON are usually homoplasmic because retinas must be homoplasmic mutant for a person to have disease symptoms. Which is true about a female who is heteroplasmic for the mutation that causes LHON? (Select all that apply.)
A) She may have children who are blind due to LHON. B) Some cells in her body are probably homoplasmic. C) She is likely to develop the disease in other parts of her body. D) All of her children will be homoplasmic for the wild-type mitochondria.
Which of the following statements about the endoplasmic reticulum (ER) is false?
(a) The ER is the major site for new membrane synthesis in the cell. (b) Proteins to be delivered to the ER lumen are synthesized on smooth ER. (c) Steroid hormones are synthesized on the smooth ER. (d) The ER membrane is contiguous with the outer nuclear membrane.