What two factors are associated with a decline in fast-twitch muscles?
What will be an ideal response?
The proportion of fast-twitch muscles declines with age. The proportion of fast-twitch muscles also declines with lack of exercise.
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Edouard van Beneden proposed that an egg and a sperm, each containing half the complement of chromosomes found in somatic cells, fuse to produce a single cell called a(n) ______.
A. zygote B. karyotype C. embryo D. oocyte
Which of the following is the fundamental organizational unit of structure and function in living things?
a. Atoms b. Molecules c. Cells d. Organelles
Which of the following is/are true about natural selection?
A. It assures the survival of every fit individual. B. It acts on genotypes rather than phenotypes. C. It always selects for more complex forms. D. On average, it favors the survival of individuals that have adaptive characteristics. E. All of the answer choices are correct.
The ability to extend a leg is the result of
a. contraction of ligaments and tendons. b. contraction of a muscle. c. lengthening of a muscle. d. a combination of push and pull by antagonistic muscle pairs. e. relaxation of myosin and actin proteins.