Asgard archaea are currently a proposed superphylum rather than being universally accepted because ________.
A. they have genes that encode eukaryotic signature proteins such as actin and tubulin
B. they possess intracellular trafficking proteins even though they lack endoplasmic reticula and Golgi apparati
C. they are known only through DNA sequence fragments; they have not been cultivated in the laboratory
D. they are found in chemically and geographically diverse sites
Answer: C
You might also like to view...
Which of the following statements are not true of the relationship of xylem and phloem?
A. Water exiting the phloem may enter the xylem and be transported to leaves. B. The volume of water moving through the phloem is small compared to that in the xylem. C. The number and size of xylem conduits greatly exceeds the number and volume of sieve tubes. D. In phloem, the plant actively generates the force that drives transport, whereas movement in xylem is largely driven by transpiration. E. Phloem cells are dead at maturity, whereas xylem cells are alive at maturity.
A large number of people in an African village become ill a couple of weeks after sharing a feast of stew made from the meat of jungle animals. They initially have fever, headache and fatigue, and develop petechiae. Most then experience bloody diarrhea
and vomiting, and a few days later begin bleeding from the mouth and eyes. What is the most likely preliminary diagnosis? A) dengue hemorrhagic fever B) ebola hemorrhagic fever C) yellow fever D) malaria E) African trypanosomiasis
A plot of water-soaked soil will have less of the form of nitrogen known as ________ than dry soil
Fill in the blank(s) with correct word
Which structures are part of the same primary germ layer?
A) skin, tooth dentin, tonsils B) muscle, kidneys, dermis of skin C) bones, blood, thyroid gland D) uterus, bladder, pituitary gland