Mature red blood cells have no nucleus or mitochondria
Indicate whether the statement is true or false
TRUE
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The three physical forms of laboratory media are ________.
A. solid, liquid, and gas B. a streak plate, a pour plate, and a broth C. reducing, transport, and enumeration D. solid, semisolid, and liquid
Researchers generally insert engineered Ti plasmids into plant cells by ________
a. electric shock b. inserting the plasmid into A. tumefaciens and allowing the bacteria to infect a plant c. chemical shock d. coating microscopic bullets with the plasmid and shooting them into a plant cell
Type II survivorship curves ____
a. are characteristic of humans and elephants b. indicate a fairly constant rate of death at all ages c. indicate a high mortality rate in the very young d. are characteristic of species in which most individuals live a relatively long life and die of old age e. are typical of species with high biotic potentials
The first half of the menstrual cycle is know as the _______ phase.
Fill in the blank(s) with the appropriate word(s).