A scientist conducts a procedure that causes nitrogen atoms to gain neutrons. The resulting atoms will be:
A. ions of nitrogen.
B. positively charged.
C. negatively charged.
D. isotopes of nitrogen.
E. new elements with higher atomic numbers.
D
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What is the primary function of the transverse tubules?
A. They conduct action potentials from the surface of the muscle fiber to internal regions near myofibrils. B. They act as a channel for Ca2+ ions during excitation-contraction coupling. C. They form cross-bridges between actin and myosin during muscle contraction. D. They attach troponin to tropomyosin. E. They attach muscle fibers to skeletal elements to exert force.
In common English, "linkage" refers to one event that tends to occur when another does. In genetics, linkage has a precise meaning. It refers to the transmission of
A) two genes that have the same effect. B) two genes on different chromosomes. C) two genes on the same chromosome. D) genotype and phenotype to an offspring.
In the open ocean, concentrations of oxygen reach a minimum value of 500-1000 m, a region referred to as the oxygen ________
Fill in the blank(s) with correct word
Which of the following hormones has the fewest targets?
A. Thyroid-stimulating hormone B. Growth hormone C. Testosterone D. Oxytocin E. Melatonin