In humans, hair texture is an incompletely dominant trait. Curly is the dominant genotype, wavy is
heterozygous, and straight hair is recessive. What is the probable phenotypic ratio for a cross between
a man with wavy hair and a woman with curly hair?
A. All wavy hair
B. 3/4 wavy hair; 1/4 straight hair
C. 1/2 wavy hair; 1/2 curly hair
D. All curly hair
E. 1/4 curly hair; 1/2 wavy hair; 1/4 straight hair
C
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The type of movement that is specific and requires carrier molecules and energy is
A. exocytosis. B. facilitated diffusion. C. active transport. D. endocytosis. E. osmosis.
Which of the following is not true regarding the history of life on Earth?
A. The history of planet Earth includes alternations between colder periods ("icehouses") and warmer periods ("greenhouses") on the surface of the planet. B. The rise of more complex organisms such as eukaryotes has resulted in a reduction in diversity of more "primitive" organisms such as bacteria. C. There have been repeated incidents of mass extinction in the history of the planet in which species diversity has been reduced by 50% or more.
Lining of mouth and anus originate from _____, while lining of the respiratory tract originate from
______.
a. ectoderm; endoderm b. ectoderm; mesoderm c. endoderm; ectoderm d. endoderm; mesoderm e. mesoderm; endoderm
The pentose phosphate pathway generates all the necessary precursors for nucleotide biosynthesis.
Answer the following statement true (T) or false (F)