The earliest oxygenic phototrophs are thought to be
A. purple sulfur bacteria.
B. green nonsulfur bacteria.
C. purple nonsulfur bacteria.
D. cyanobacteria.
E. green nonsulfur bacteria AND purple nonsulfur bacteria.
D
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Which of the following structures of the eye is matched appropriately with its developmental material?
a. cornea ? ectoderm b. cornea ? crystallin c. lens ? optic cup d. retina ? crystallin e. retina ? ectoderm
Antimicrobials effective against a wide variety of microbial types are termed ________.
A. semisynthetic drugs B. synthetic drugs C. narrow-spectrum drugs D. antibiotics E. broad-spectrum drugs
What event typically begins in anaphase and is completed soon after the end of telophase?
A) interphase B) packing of DNA into well-defined chromosomes C) cytokinesis D) alignment of chromosomes at the cell equator
Answer the following questions true (T) or false (F)
1. A bacteria's DNA can be found in the nucleus of the cell. 2. According the endosymbiont theory we can reason that the merging event that led to the mitochondria occurred before the merging event that led to the chloroplast because all eukaryotic cells which have chloroplasts also have mitochondria, but all cells that have mitochondria do not necessarily have chloroplasts. 3. Binary fission, mitosis, and meiosis all produce genetically identical daughter cells.