Crossing over is __________.
A. the formation of tetrads
B. the exchange of corresponding portions of homologous chromosomes
C. the movement of genetic material from one chromosome to a nonhomologous chromosome
D. an independent assortment of chromosomes
B. the exchange of corresponding portions of homologous chromosomes
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Achondroplasia ____
a. is inherited as an autosomal recessive condition b. affects about one in one million people c. affects only homozygotes d. is characterized by abnormally short arms and legs
e. is inherited as an X-linked disorderWhen calcium levels rise, the __________ secrete(s)
__________, which __________ osteoclast activity. a. parathyroids; calcitonin; suppresses b. thyroid; calcitonin; suppresses c. thyroid; calcitonin; enhances d. thyroid; PTH; suppresses e. parathyroids; PTH; enhances
In the disease myasthenia gravis, there is a deficiency of acetylcholine receptors at the neuromuscular junction. This shortage blocks contraction by preventing
A. generation of action potentials in the muscle fiber. B. the interaction of troponin with tropomyosin. C. release of Ca2+ from the sarcoplasmic reticulum. D. opening of the T-tubule system. E. generation of action potentials in the motor neuron.
Three of the four answers listed below are parts of a common molecule. Select the exception
a. phosphate group b. adenine c. deoxyribose d. ribose