Which statement best describes polyribosomes?
A) They are only found in archaea.
B) They can occur in archaea, bacteria, and eukaryotes during transcription.
C) They can only form after RNA has left the nucleus in eukaryotes, but are found in all domains.
D) They can only form in eukaryotes, not in other organisms, and can only form once the RNA has been fully processed.
Ans: C) They can only form after RNA has left the nucleus in eukaryotes, but are found in all domains.
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Eukaryotes have ________ in their cytoplasmic membranes, which serve to strengthen and stabilize the membrane and make it less flexible. Many bacteria have similar molecules, known as ________, in their cytoplasmic membranes that have a similar role
A) ether bonds / ester bonds B) lipids / phospholipids C) sterols / hopanoids D) phospholipids / lipopolysaccharides
One microenvironment of the skin is an area where glands produce an oily substance called
A) mucus. B) sebum. C) fimbrae. D) lipid A.
Alan Cooper, Cécile Mourer Chauviré, Geoffrey Chambers, Arndt von Haeseler, Allan Wilson and Svante Pääbo investigated the evolutionary relationship among some extinct and living species of flightless birds. They concluded that kiwis are more closely related to African and Australian flightless birds than they are to the moas. What hypothesis did they propose from this conclusion?
A. That their data was incorrect and the sample from the museum was corrupted. B. That flightless birds only occurred once in New Zealand. C. That New Zealand was colonized twice by ancestors of flightless birds. D. That the South American species ancestors flew to New Zealand before the flightless mutation occurred. E. That the North American flightless bird originated from an ancestor of the New Zealand species.
Fast-twitch muscle fibers ________.
Fill in the blank(s) with the appropriate word(s).