In bacterial cells, a cell that had the F plasmid integrated into the chromosome is known as
A) F-.
B) F+.
C) F'.
D) Hfr.
E) none of the above
D) Hfr.
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Which of the following traits is not characteristic of arthropods?
a. jointed appendages b. hardened exoskeleton c. specialized developmental stages d. lack segmentation
Explain the concept of a keystone species
What will be an ideal response?
Which of the following scientists demonstrated
for the first time that molecules of life could have come from nonliving entities (gases, water, and spark discharge)?
a. Crick and Orgel b. Wallace c. Miller and Urey d. Chargaff e. Cuvier and Lyell
Because archaeons lack peptidoglycan in their cell walls ________.
A. some have an outer layer of complex polysaccharide and some have an outer layer of protein B. some have an outer layer of complex polysaccharide C. some have an outer layer of protein D. they must always be grown in isotonic medium