__________ species of many plants (and a few animals) originated by chromosome doublings and hybridizations. Fill in the blank(s) with the appropriate word(s)
ANSWER: Polyploid
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DNA is the main hereditary material of all life. However, DNA lacks one important characteristic for the first forms of life. Why have researchers rejected the idea that DNA was found in the first life form?
A) It does not function as a catalyst. B) It is not stable enough to have withstood early Earth's harsh atmosphere. C) DNA only has four types of bases. Therefore, DNA cannot adapt and evolve. D) The type of sugar found in DNA is too complicated to have been present early in Earth's history.
Which is not a method bacteria use to generate new combinations of genes?
A) Transformation B) Transduction C) Binary fission D) Conjugation
S-layer is:
A. the layer between inner and outer membrane in gram negative bacteria B. also known as slime layer C. common among archaea D. there is more than one correct answer E. made of polysaccharides
Scanning electron microscopy (SEM) ________.
a. can be used to view biomolecules at the atomic level b. requires no special treatment of the specimen c. provides a three-dimensional image of a cell's surface d. is used to view internal cellular structure