Individual prokaryote cells are ________ eukaryote cells; collectively, all prokaryote cells on Earth ________
A) the same size as; weigh about one-tenth the total mass of eukaryote cells
B) much larger than; weigh about 10 times as much as the total mass of eukaryote cells
C) much smaller than; weigh about one-tenth the total mass of eukaryote cells
D) the same size as; weigh about 10 times as much as the total mass of eukaryote cells
Answer: D
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The Lyon hypothesis attempts to explain the molecular mechanism of _____
A. X-inactivation B. Genomic imprinting C. Maternal inheritance D. Extra nuclear inheritance
A circulatory system that allows some mixing
of oxygenated and oxygen-poor blood is indicated by a. A. b. B. c. C. d. A and B. e. all of these
A human population that is shrinking would be characterized by:
a. a large proportion of prereproductive individuals. b. a small proportion of prereproductive individuals. c. a large proportion of reproductive individuals. d. an equal number of individuals of all age groups. e. a small proportion of postreproductive individuals.
In humans, identical twins are possible because _____
A) cytoplasmic determinants are distributed unevenly in unfertilized eggs B) extraembryonic cells interact with the zygote nucleus C) early blastomeres can form a complete embryo if isolated D) the gray crescent divides the dorsal-ventral axis into new cells