Less-developed countries are most likely to be characterized by:
a. low fertility rates.
b. high GNI PPPs.
c. low doubling times.
d. high use of contraception.
e. high infant mortality rates
e
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Gene duplications in Bacillus subtilis have resulted in a large gene family that encodes ________ transporters.
What will be an ideal response?
The secondary structure of a protein forms ____
a. pleated sheets or coils b. when pleated sheet regions fold back on themselves c. from interactions between polypeptide chains d. from covalent bonding between amino acids e. a functional chromatin unit
The first vascular plants evolved during the _____ period.
A. Silurian B. Carboniferous C. Cambrian D. Ordovician E. Devonian
Glucose and sugars in DNA and RNA
a. have the same number of carbon atoms. b. have the same structural formulas. c. are the two components of sucrose. d. are monosaccharides. e. are both components of RNA.