Four of the five answers below are factors that contribute to strong fossil records of certain species. Select the exception
a. persisted for a long time
b. hard body parts
c. concentrated in one geological area
d. lived in dense populations
e. widespread distribution
c
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Why isn't bacterial DNA digested by the restriction enzymes bacteria produce?
A) The sequence recognized and cleaved by a restriction enzyme is not found in the bacterial genome. B) Bacterial cells have high concentrations of ligase which immediately repairs the any sites that are cleaved. C) Methyl groups added to the bases of restriction enzyme recognition sites within the bacterial chromosome block cleavage. D) Bacterial DNA is modified with phosphate groups that prevent the function of restriction enzymes. E) Restriction enzymes are found in the cytoplasm and DNA is only in the nucleus.
Most organisms live in habitats that provide specific conditions or a(n) ________ that may be very different from regional weather patterns
Fill in the blank(s) with correct word
Sometimes the immune system overreacts from exposure to a normally harmless substance such as cat hair. Subsequent exposure to this allergen elicits a massive inflammatory response
Because the chemical histamine is the cause of this inflammation, what cell type is most likely behind the problem? A) neutrophils B) basophils C) lymphocytes D) monocytes
Identify all of the potential energy sources for prebiotic chemical reactions in this picture
What will be an ideal response?