What is the best description of double fertilization in angiosperms?
A. One sperm fertilizes the egg, which develops into the embryo; the other sperm fertilizes the ovary, which becomes the fruit.
B. One sperm fertilizes the egg, which develops into the embryo; the other sperm fertilizes the polar nuclei, which forms the endosperm.
C. One sperm fertilizes the egg, which develops into the embryo; the other sperm fertilizes the polar nuclei, which forms the seed coat.
D. One sperm fertilizes the egg, which develops into the embryo; the other sperm produces the pollen tube.
E. One pollen grain fertilizes the embryo sac; the other sperm fertilizes the pollen grain.
B. One sperm fertilizes the egg, which develops into the embryo; the other sperm fertilizes the polar nuclei, which forms the endosperm.
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Indicate whether the statement is true or false.
Deinococcus radioduransis (select all that apply):
A. resistant to ionizing radiation. B. able to repair DNA breaks without ATP. C. killed via desiccation. D. unique in its ability to withstand ionizing radiation. E. adapted to withstand the desert environment.
The role of DNA ligase in DNA replication is to
a. add more nucleotides to the growing strand one at a time. b. open up the two DNA strands to expose template strands. c. ligate base to sugar to phosphate in a nucleotide. d. bond Okazaki fragments to one another. e. remove incorrectly paired bases.
Because of its association with tools, the earliest human was called ________ meaning "handy man."
A. Cro-Magnon B. Homo sapiens C. Homo habilis D. Neanderthal E. Homo erectus