Two characteristics shared by gymnosperms and angiosperms that are absent from earlier plant groups and represent key adaptations to life on dry land are
A) a vascular system and lignin.
B) flagellated sperm and gametangia.
C) flowers and fruits.
D) pollen and seeds.
Answer: D
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Each of the following is true about plant rosettes except
A) rosettes are localized in the plasma membrane. B) rosettes are cellulose-synthesizing enzyme complexes. C) rosette deposition of cellulose microfibrils is directed by microtubules. D) rosettes move in the plasma membrane to deposit growing cellulose microfibrils. E) rosettes deposit cellulose microfibrils only in the middle lamella.
Sex-linked traits:
a. are controlled by genes on the X and Y chromosomes. b. are only inherited from the father. c. appear more frequently in females if they are recessive. d. cannot be visualized using a pedigree. e. are only controlled by genes on the Y chromosome.
An example of a commercially significant human protein produced in bacteria is ________. The gene for the protein is inserted into bacteria using specifically designed ________.
A. hemoglobin; vectors B. insulin; plasmids C. AZT; plasma D. globulins; hosts
The conversion of pyruvic acid to acetyl-CoA can be described as ________, because a molecule of CO2 is produced as a by-product
A) decarboxylation B) amination C) respiration D) oxidation E) phosphorylation