In many spirochetes, multiple flagella combine to form a bundle known as a(n) ________ fibril, which winds around the cell and confers motility on the cell.
Fill in the blank(s) with the appropriate word(s).
axial
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Samantha drank a lot of alcohol over many years and now suffers from this fatty degeneration of the liver
A) Large intestine B) Stomach C) Esophageal cancer D) Appendix E) Mouth F) Salivary glands G) Rectum H) Cirrhosis I) Gallbladder J) Small intestine
During the ____ period, because their symptoms are declining as they are recovering, many patients stop taking their antibiotics
Fill in the blank(s) with the appropriate word(s).
Which of the following is true of embryonic stem cells but not of adult stem cells?
A) They normally differentiate into only eggs and sperm. B) They can give rise to all cell types in the organism. C) They can continue to reproduce for an indefinite period. D) One aim of using them is to provide cells for repair of diseased tissue.
Electron microscopes use electrons rather than light to view a specimen. Some of these microscopes pass a stream of electrons through a specimen. Both the stream of electrons and the specimen must be in a vacuum chamber. What is a limitation of using such an electron microscope?
A) Living specimens cannot be observed. B) Prokaryotic cells cannot be examined. C) Images appear very fuzzy because of low resolution. D) The power of magnification decreases.