It is generally thought that animals have undergone four major physiological and anatomical innovations during their evolution. These are (in no particular order)
a. multicellularity, bilateral symmetry, origin of patterns of embryonic development, development of tissues.
b. development of the versatile forelimb, multicellularity, origin of patterns of embryonic development, development of tissues.
c. development of tissues, photosynthesis, bilateral symmetry, multicellularity.
d. bilateral symmetry, development of tissues, origin of the multichambered heart, origin of patterns of embryonic development.
e. origin of patterns of embryonic development, development of the versatile forelimb, origin of the multichambered heart, multicellularity.
A
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A diploid spore-producing plant body that grows by mitotic cell divisions of a fertilized egg is a ________
a. megaspore b. sporophyte c. microspore d. gametophyte
Which of the following is a true statement about proteins?
A. Proteins are used to insulate the body from cold and protect it from abuse. B. Extra proteins are stored in the liver and brain. C. Proteins are made up of amino acids bonded together. D. Proteins are used to produce ATP for the cell. E. Even small changes in temperature and pH will immediately destroy a protein's shape and function.
In what type of population would evolution occur most rapidly?
A) a large population with a large gene pool B) a small population with a relatively diverse gene pool C) a small population with a small gene pool D) a large population with a relatively limited gene pool
The total DNA content of each daughter cell is reduced during meiosis because
a. chromosomes do not replicate during the interphase preceding meiosis I. b. chromosomes do not replicate between meiosis I and II. c. half of the chromosomes from each gamete are lost during fertilization. d. sister chromatids separate during anaphase of meiosis I. e. chromosome arms are lost during crossing over.