Despite seeming counterproductive, an increase in arterial carbon dioxide levels activates ________, which causes a(n) ________ in heart rate and a(n) ________ in total peripheral resistance.
A) chemoreceptors: decrease : decrease
B) baroreceptors : decrease : decrease
C) baroreceptors : decrease : increase
D) baroreceptors : increase : increase
E) chemoreceptors : decrease : increase
Answer: E) chemoreceptors : decrease : increase
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Which of the following is NOT part of the structure of the nucleosome core particle?
A. It is composed of an octamer of proteins. B. There is a linker region between two nucleosomes of about 200 base pairs. C. There are two copies each of H2A, H2B, H3 and H4. D. The DNA is wrapped around the core slightly over two complete turns E. The DNA wrapped around the core contains 146-147 base pairs.
Rubisco has 16 subunits joined together to make a functional unit. Eight of the subunits are large, the
other 8 are small. What does this tell you about this protein's structure?
a. It is an example of a protein having quaternary structure. b. The protein has tertiary structure and domains but no quaternary structure. c. The primary sequence of all 16 subunits is identical, which is a unique property of enzymes participating in photosynthesis. d. The subunits each have 8 alpha helices in order to bind to CO2 and RuBP. e. It's an enzyme that is extremely resistant to denaturation.
Aerobic respiration evolved in
a. some bacteria. b. some archea. c. animals. d. mitochondria. e. in some bacteria and some archea.
Intrinsic factor is used to aid in the absorption of
a. vitamin E. b. vitamin C. c. vitamin D. d. vitamin K. e. vitamin B12.