Two or more atoms joined together through the sharing of electrons are called a(n)
A. molecule.
B. ion.
C. isotope.
D. atomic unit.
E. compound.
Answer: A
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Which of the following classes is comprised of carnivorous predators that are able to extend their stomachs through their mouths to feed?
A) Ophiuroidea B) Holothuroidea C) Asteroidea D) Crinoidea E) Echinoidea
Blood enters the glomerulus by an _____ and leaves by an _____
A. afferent arteriole; efferent arteriole B. efferent arteriole; afferent arteriole C. afferent arteriole; efferent venule D. efferent arteriole; afferent venule E. efferent venule; afferent arteriole
The critical tissue for producing a vasodilatory effect of acetylcholine in Robert Furchgott's experiments with rabbit aortas was the
A. endothelium. B. smooth muscle layer. C. elastic outer layer. D. pericardium. E. one-way valves.
Two organisms, AABBCCDDEE and aabbccddee, are mated to produce an F1 that is self-fertilized
If the capital letters represent dominant, independently assorting alleles: (a) How many different genotypes will occur in the F2? (b) What proportion of the F2 genotypes will be recessive for all five loci? (c) Would you change your answers to part (a) and/or part (b) if the initial cross occurred between AAbbCCddee × aaBBccDDEE parents? (d) Would you change your answers to part (a) and/or part (b) if the initial cross occurred between AABBCCDDEE × aabbccddEE parents?