Dinosaurs disappeared at the end of which period?
A. Cretaceous
B. Permian
C. Triassic
D. Jurassic
E. Cambrian
A
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Which of the following statements is false?
a. A female has more oocytes before she is born than at any time during her life. b. Meiosis II will not occur in an oocyte unless it is fertilized. c. Fertilization occurs in the vagina. d. Implantation occurs in the uterus. e. The vagina serves as the birth canal.
The tropical rainforest trees form shallow roots concentrated near the surface in a mat few centimeters
thick. These swollen bases or braces are called:a. prop roots. b. pneumatophores. c. aerial roots. d. buttress roots. e. velamen roots.
Which of these events occurred most recently in the history of Earth?
a. formation of oxygen b. first humans c. evolution of land plants, fungi, and land animals d. origin of eukaryotes e. origin of multicellularity
The three-dimensional structure of a protein is determined primarily by:
A) electrostatic guidance from nucleic acid structure. B) how many amino acids are in the protein. C) hydrophobic interaction with lipids that provide a folding framework. D) modification during interactions with ribosomes. E) the sequence of amino acids in the protein.