The genes that play a role in the biological clock code for what specific molecules?
a. nucleotides
b. tissues
c. proteins
d. carbohydrates
e. DNA
C
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What is the key difference between incomplete dominance and codominance?
a. In incomplete dominance, the recessive allele cannot be detected; in codominance, the expression of the recessive allele is apparent. b. In incomplete dominance, it is possible to detect the expression of a recessive allele; in codominance, both alleles contribute equally to the phenotype. c. In codominance, it is possible to detect the expression of a recessive allele; in incomplete dominance, both alleles contribute equally to the phenotype. d. In incomplete dominance, it is possible to detect the expression of the dominant allele; in codominance, two different genes contribute to a single phenotype. e. The two terms are synonymous.
Twins are said to be concordant for a trait when
A. both twins exhibit the trait. B. only identical twins exhibit the trait. C. only fraternal twins exhibit the trait. D. fraternal twins more often show the trait than identical twins. E. None of these is true.
The primary structure of a protein is the ____________________ in a polypeptide chain Fill in the blank(s) with the appropriate word(s)
Which of the following statements about biomes, the major terrestrial ecosystems covering the Earth, is true?
A) Each of the nine major biomes is restricted to just one or two continents. B) The major factors affecting the distribution of biomes are wind and sunlight. C) Most biomes are characterized by a particular group of species. D) Most natural biomes are unaffected by human activity. E) Fire is very important in some biomes.