Which of the following would explain two chromosomes in an individual cell that contain some, but not all, of the same genes at the same loci?
a. Both of the chromosomes are paternal.
b. Both of the chromosomes are maternal.
c. The chromosomes are from a common ancestor.
d. A chromosomal alteration has occurred.
d. A chromosomal alteration has occurred.
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The bond in table salt (NaCl) is
a. polar. b. ionic. c. covalent. d. double. e. nonpolar.
Why do the abalones (a type of mollusk) rarely produce hybrids?
a. Various abalones have different mating and courtship behaviors. b. Abalones do not coexist with individuals of other abalone species. c. Abalones are ecologically isolated. d. Their eggs and sperm fail to develop. e. Abalone eggs are surrounded by a membrane that can be penetrated only by sperm containing a particular enzyme.
Which of the following is NOT an important feature in distinguishing animals from each other?
a. presence and cellular arrangement of tissues b. growth of skeletal elements c. body symmetry d. development of the gut e. method of locomotion (movement)
Which of type of information is not communicated by proprioceptors?
A. Limb movement B. Muscle temperature C. Muscle contraction D. Muscle stretch E. Muscle position