The heath hen, found off the east coast of North America in the eighteenth century, is now extinct. What finally caused its extinction?
A) overexploitation
B) pollution
C) natural disasters
D) habitat loss
C
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What are the three domains of life?
a. animals, plants, and microorganisms b. Archaebacteria, Eubacteria, and Eukaryota c. Prokaryota, Eukaryota, and Protoctista d. Archaea, Bacteria, and Eukarya
Four of the five answers listed below are events occurring during mitosis. Select the exception
A) Division of centromere B) Attachment of spindle microtubules to centromeres C) Migration of chromosomes to opposite ends of the cell D) Chromosome replication E) Lining up of chromosomes at the cellular equator
When a female has low levels of estrogen and progesterone, ________
A) she is menstruating B) she is ovulating C) her uterus is ready to accept an embryo D) she is pregnant
Which of the following statements concerning enzymes is FALSE?
A) They are usually, but not always, proteins. B) They always function best at 37°C. C) They can be denatured if the pH of their environment is too high or too low. D) They form a temporary intermediate compound with a substrate. E) They can be used to catalyze a chemical reaction over and over again.