Answer the following statements true (T) or false (F)
1. Heterotrophs must acquire carbon from organic molecules produced from other organisms.
2. An organism to which oxygen is toxic is an obligate anaerobe.
3. Because Archaea were first found in environments that lacked oxygen or were very hot, acidic, or salty, they were nicknamed "extremophiles."
4. The main difference between gram-positive bacteria and gram-negative bacteria is in the structure of their cell membranes.
5. Many prokaryotes play vital roles in global nutrient cycles.
1.TRUE
2.TRUE
3.TRUE
4.FALSE
5.TRUE
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What do we call the class of enzymes that phosphorylate GMP to GDP or GTP?
a. secondary messengers b. kinases c. phosphorylases d. inositol phospholipids
An unexpected change in a cell's genetic makeup is called a ________.
Fill in the blank(s) with the appropriate word(s).
A skeletal muscle deprived of adequate ATP supplies will _____
A) immediately relax B) enter a state where actin and myosin are unable to separate C) fire many more action potentials than usual and enter a state of "rigor" D) sequester all free calcium ions into the sarcoplasmic reticulum
Mycoplasma is classified as a member of the Firmicutes in spite of the observation that it stains (acid-fast/Gram-positive/Gram-negative).
Fill in the blank(s) with the appropriate word(s).