The group that probably gave rise to chloroplasts is the
A. green photosynthetic bacteria.
B. purple sulfur bacteria.
C. methane bacteria.
D. cyanobacteria.
E. nonsulfur purple bacteria.
Answer: D
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Which of the following is the best modern definition of evolution?
A) descent with modification B) change in the number of genes in a population over time C) survival of the fittest D) inheritance of acquired characters
Which of the following organ systems is responsible for eliminating metabolic wastes from the body?
a. excretory system b. respiratory system c. nervous system d. excretory and respiratory system e. excretory, respiratory, and circulatory system
During which phase of meiosis will the chromosomes appear as packets of four chromatids?
a. anaphase I b. telophase II c. anaphase II d. prophase I e. metaphase II
The most common lethal genetic disease in the United States is cystic fibrosis.
a. true b. false