A hominid of Europe and Asia that became extinct about 35,000 years ago was:
a. a dryopith
b. Australopithecus boisei
c. Homo erectus
d. Neanderthals
e. Australopithecus robustus
d
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The most widely used ecoregion system was developed by conservation scientists of the ____
a. US Department of Agriculture b. Environmental Protection Agency c. International Union for Conservation of Nature and Natural Resources d. World Wildlife Fund e. Intergovernmental Panel on Climate Change
The settling of an embryo into the lining of the uterus is called
A. fertilization. B. cleavage. C. menses. D. implantation.
If an RNA does not normally code for a protein, then
A. it is mature mRNA. B. the RNA is pre-mRNA. C. it is probably tRNA or rRNA D. the RNA is a lipid.
Which of the following statements best summarizes the acid-growth hypothesis in an actively growing shoot?
A) Auxin stimulates proton pumps in the plasma membrane and tonoplast. B) Auxin-activated proton pumps lower the pH of the cell wall, which breaks bonds and makes the walls more flexible. C) Auxins and gibberellins together act as a lubricant to help stretch cellulose microfibrils. D) Auxins activate aquaporins that increase turgor pressure in the cells.