The "greenhouse gas" methane is produced by
A. Archeae.
B. fungi.
C. algae.
D. animals.
E. both fungi and alga.
Answer: A
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Conjugation is a process by which bacterial cells ____
a. transfer DNA from one cell to another through a cytoplasmic bridge b. release DNA into their surroundings to be taken up by neighboring bacteria c. disrupt each other by lysing cell membranes d. are infected with a virus e. use a bacteriophage to carry DNA from one bacterium to another
A(n) ___ is an embryonic form with three
primary tissue layers.
a. zygote b. gastrula c. blastula d. mesoderm e. embryo
When a researcher transplanted the nucleus of an intestinal cell from a tadpole into an egg cell whose nucleus had been destroyed, the egg developed into a normal frog. This illustrates that
A) genes are gained during the process of differentiation. B) a nucleus that is removed from its normal location is influenced by adjoining cells. C) each cell of an organism has all the genes needed for development. D) the homeobox genes in a transplanted nucleus undergo mutation. E) scientists can clone a human by putting one of his or her nuclei into an egg cell.
Assuming geological evidence is accurate, life on Earth may have originated ____ billion years ago
a. 14 b. 4.6 c. 3.5 d. 2.1 e. 1.2