Maintenance of the uterine lining during pregnancy in mammals requires
A. estradiol.
B. testosterone.
C. cortisol.
D. aldosterone.
E. progesterone.
E. progesterone.
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Which of the following sequences is not generally found in the core promoter of RNA polymerase II?
A. BRE B. DPE C. enhancer D. Inr E. TATA
The addition of a strong acid like HCl to an aqueous solution would result in
A. the release of H+ into the solution. B. an increase in pH. C. a decrease in pH. D. both the release of H+ and an increase in pH. E. both the release of H+ and a decrease in pH.
The presence of a contractile vacuole indicates that a single-celled protist _____
a. is marine c. is photosynthetic b. lives in fresh water d. secretes a toxin
Photosynthesis is the process by which __________________ use the energy from sunlight to produce sugar.
A) chloroplasts B) nitrogen-fixing bacteria C) denitrifying bacteria D) mitochondria E) all living creatures