Mature red blood cells have no nucleus or mitochondria

Indicate whether the statement is true or false


TRUE

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology

The first half of the menstrual cycle is know as the _______ phase.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology