The largest U.S. national parks are of sufficient size to maintain populations of all mammal species originally found in these parks.
a. true
b. false
Ans: b. false
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Which of the following is not true of the genus Lactobacillus?
A. Many species are pathogenic in humans and animals. B. They do not produce endospores. C. They are responsible for spoilage of beer, milk, and meat. D. They are used in the production of fermented vegetable foods, beverages, sour dough, hard cheeses, yogurt, and sausages.
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Figure 39.7A
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Use the figure above to answer the following question.
The teeth designated by the letter "D" in the above figure are called ____.
A. canines B. premolars C. incisors D. molars E. wisdom teeth
What could be the result if somehow two follicles made it to the late tertiary stage and burst from the ovary?
A. Excessively high estrogen levels, causing menstruation B. Twins C. Permanent infertility D. Nothing unusual -- this describes typical ovulation
Before chromosomes segregate in M phase, they and the segregation machinery must be appropriately prepared. Indicate whether the following statements are true or false. If false, change a single noun to make the statement true
A. Sister chromatids are held together by condensins from the time they arise by DNA replication until the time they separate at anaphase. B. Cohesins are required to make the chromosomes more compact and thus to prevent tangling between different chromosomes. C. The mitotic spindle is composed of actin filaments and myosin filaments. D. Microtubule-dependent motor proteins and microtubule polymerization and depolymerization are mainly responsible for the organized movements of chromosomes during mitosis. E. The centromere nucleates a radial array of microtubules called an aster, and its duplication is triggered by S-Cdk. F. Each centrosome contains a pair of centrioles and hundreds of ?-tubulin rings that nucleate the growth of microtubules.