The plastids of kelps and other brown algae arose through secondary endosymbiosis. What modern organisms are most closely related to the type of cell that eventually became these plastids?
A. Chlamydomonas (a single-celled green alga)
B. coccolithophorids
C. cyanobacteria
D. Trypanosoma (a kinetoplastid)
E. dinoflagellates
Answer: A
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An excitatory postsynaptic potential (EPSP):
a. results in a partial depolarization of the neuron. b. causes a neuron to fire. c. prevents a neuron from firing. d. results in a partial hyperpolarization of the neuron. e. results in partial depolarization of presynaptic neurons, causing ions to pass through connecting channels.
Nonrandom associations between alleles at different loci are referred to by which term?
A. heterozygosity B. inbreeding depression C. panmictic D. Linkage disequilibrium E. linkage equilibrium
What are the two major components of cell membranes?
A. glycolipids and phospholipids B. cholesterol and proteins C. phospholipids and carbohydrates D. phospholipids and cholesterol E. phospholipids and proteins
About ________ percent of human genes are alternately spliced.
A) 10 B) 40 C) 75 D) 90