The basic unit of contraction in a skeletal muscle is ____
a. the cell
b. the myofibril
c. a sarcomere
d. actin
e. myosin
ANSWER: c
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According to cladistics, a derived character state is called a(n) ____
a. apomorphy b. exaptation c. polymorphy d. homology e. homoplasy
Living organisms must gather energy and materials from their surroundings to ____
a. build new biochemicals b. grow c. maintain and repair their parts d. produce offspring e. all of these
Huntington's disease is caused by:
a. a rare recessive allele. b. a repeat of a nucleotide triplet in a gene. c. a monosomic condition. d. a dominant X-linked allele. e. a deletion of part of chromosome 4.
Grizzly bears have large geographic ranges that consist of mosaics of forests and grasslands at varying altitudes. Grizzlies also require relatively pristine water sources in their range. Based on this, what species type best describes grizzly bears?
A. flagship species. B. endemic species. C. indicator species. D. keystone species. E. umbrella species.