Repeated sequences make DNA sequencing challenging for of all of the following reasons EXCEPT:
A. repeated sequences are typically longer
than the short sequences obtained by
automated sequencing.
B. there is no easy way to determine how
many copies of the same repeat are present
within one chromosome.
C. short repeats may fold back upon
themselves to form a double-stranded
structure that is not easily sequenced.
D. the long repeats often have mutations that
are not easily sequenced.
E. All of the answer options are challenges to
DNA sequencing due to repeated sequences.
D
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The research of James A. Thompson and his coworkers shows that sustainable human stem cell
colonies can be established. As experimental evidence of this, they showed that
a. human stem cell colonies could survive outside the body if exposed to a bed of mouse fibroblasts. b. stem cell telomerase remained inactive in established cell colonies. c. cultured stem cells could differentiate when injected into apes. d. cultured stem cells could differentiate when injected into chicken embryos. e. human stem cells could on differentiate into muscle tissue.
Explain negative feedback control using thyroid hormones as an example
What will be an ideal response?
By one hypothesis, clay _____
a. facilitated assembly of early polypeptides b. was present at hydrothermal vents c. provided energy for early metabolism d. all of these
James Ferris discovered that clay minerals are capable of ________
A) joining pyrimidines to simple sugars B) catalyzing the polymerization of activated nucleotides C) breaking down biomolecules to release energy D) activating nucleotides by adding phosphate groups E) forming microscopic spheres from short polymers of amino acids