Mitochondria are thought to have evolved from ancient bacteria. Which characteristics of a free-living bacteria have mitochondria lost over time?
A) an independent genome
B) ribosomes
C) phospholipid membranes
D) motility
E) ribosomes, phospholipid membranes, motility, and an independent genome
Answer: D
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Ring forms and a "Maltese cross" were observed in a blood smear. The vector that transmits this disease is a(n):
a. tick. b. tsetse fly. c. anopheles mosquito. d. sandfly.
Which of the following components of Streptococcus pyogenes are non-antigenic, i.e., do not elicit the host to produce antibodies against it, this it is an important virulence factor?
A. Group specific carbohydrate antigen (Lancefield's Classification) B. Capsule C. F protein D. M protein E. Streptolysin-O
A light-sensitive pigment that helps set plant circadian rhythms based on length of night is known as __________.
A. phytochrome B. chlorophyll C. thigmotropism D. ribosomes E. statoliths
You compare homologous nucleotide sequences among several pairs of species with known divergence times. A pair of species that diverged 1 million years ago has two nucleotide differences, a pair that diverged 2 million years ago has four nucleotide
differences, and a pair that diverged 3 million years ago has six nucleotide differences. You have sequence data for another pair of species for which the divergence time is unknown. There are five nucleotide differences between them. Based on your clock, when did their line of ancestry diverge? A) 3.5 million years ago B) 3 million years ago C) 2.5 million years ago D) 2 million years ago