Which of the following is a test cross? (a “dash” means the allele's identity is unknown)
a. R-MM ? R-mm
b. RRMM ? rrmm
c. R-M- ? R-Md.
rrMM ? RRmm
e. R-M- ? rrmm
E
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Which structures will make up the thick filaments of a muscle fiber? a. Sarcomeres b. None of these choices
c. Myosin d. Myofibrils e. Actin
X-ray crystallography showed that DNA:a
had the bases in the center of the molecule. b. had the sugars and phosphates on the outside of the molecule. c. was a very long molecule. d. was made of 2 strands. e. was a helix.
Which is false regarding the two-component regulatory system in bacteria?
A. One part of the system is exposed to the external cellular environment while another part is exposed to the cytoplasm. B. The system involves a sensor kinase and a response regulator. C. The sensor kinase is phosphorylated by the response regulator when the extracellular environment changes. D. Regulation of OmpF and OmpC porin proteins in E. coli is modulated by this type of system.
The 20 different amino acids found in polypeptides exhibit different chemical and physical properties because of different
A) amino groups. B) side chains (R groups). C) tertiary structure. D) carboxyl groups. E) Both A and B are correct.