Which of the following would NOT be evidence that mitochondria were once prokaryotic?
a. similarities of mitochondrial ribosomes and bacterial ribosomes
a. similarities of mitochondrial ribosomes and bacterial ribosomes
b. negative effects of antibiotics on mitochondria
c. DNA similarities of mitochondria and free-living bacteria
d. the presence of a circular chromosome
e. presence of a nucleus within mitochondria
Answer: e. presence of a nucleus within mitochondria
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The CRISPR system is said to protect or preserve genome integrity in prokaryotic cells by acting as a type of "immune system." Explain how the CRISPR system works and its limitations
What will be an ideal response?
Which bacillus-shaped genus are primarily intracellular parasites of arthropods such as crustaceans and insects?
A) Coxiella B) Klebsiella C) Roseospirillum D) Wolbachia
Which of the following is true regarding insect
tracheal systems? a. They are associated with the blood circulatory system. b. They excrete body wastes as well as transport gases. c. They depend on the opening and closing of spiracles. d. The tracheal tubes are continually open in large terrestrial insects. e. They contain respiratory pigments to enhance oxygen transport
Which of the following statements about the angiosperm embryo sac is false?
A. It is the gametophyte generation of the plant. B. The embryo sac nuclei are the product of mitotic division of a megaspore. C. The synergids flank the egg cell. D. It contains eight nuclei. E. The nuclei within the embryo sac are diploid.