Sleep apnea is more common in people who are overweight. Excess fat in the neck compresses the _, cutting off airflow.
A. larynx
B. thorax
C. bronchi
D. lungs
E. alveoli
A. larynx
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True or False: Both vertebrates and echinodermata (sea urchins and sea stars) are deuterostomes
A. true B. false
During which of the following steps of the TCA cycle does substrate-level phosphorylation take place?
A) TCA-2 B) TCA-3 C) TCA-4 D) TCA-5 E) TCA-6
Which of the following properties of RNA is most directly responsible for its ability to form complex shapes?
A) the presence of uracil instead of thymine B) the fact that RNA is primarily double-stranded C) the relative instability of RNA compared to DNA D) the fact that RNA is primarily single-stranded E) the substitution of deoxyribose in DNA with ribose in RNA
What situation results when a population of spotted salamanders in an area of vernal pools remains stable for many years and was stabilized because of resource limits?
A) Density dependence is not involved. B) Predation has decreased. C) Carrying capacity has been reached. D) Density independence occurs.