The greatest concentration of nitrogen on the planet Earth is found in
a. living organisms, including bacteria.
b. the atmosphere.
c. soil minerals.
d. fossil fuels.
e. oceans.
B
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A mutation that replaces one amino acid in a protein with another is called a __________ mutation
a. frameshift b. recombinant c. nonsense d. missense e. neutral
Can one gene make different proteins?
A) Yes, by splicing the resulting mRNA differently (i.e., removing different exons) B) Yes, by modifying the original DNA C) No, because one gene can code for only a single protein D) No, because genes do not make proteins
Landscape ecology ________
A) is the application of ecological principles to the study of land-use patterns B) focuses primarily on how to restore human-altered ecological systems C) deals primarily with ecosystems in urban settings D) deals with the study of the ranges of different species
Induced pluripotent stem cells are an attractive approach to cell replacement therapy because of all the characteristics EXCEPT:
A) they can be induced to develop into many different types of tissues B) all of these are reasons why induced pluripotent stem cells are attractive to researchers C) they can be studied using techniques already derived from work with embryonic stem cells D) they can be derived from differentiated cells E) they always require killing of an embryo