The study of how gene expression is altered by factors in the cell's environment rather than the DNA sequence of the gene itself is called ________
Fill in the blank(s) with correct word
epigenetics
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Based on comparisons of many human DNA sequences, our level of DNA variation is ____
Fill in the blank with the appropriate word.
Many specialized cells, such as white blood cells, ____
a. remain in G0 until stimulated by external signals to reenter the cell cycle and divide b. remain in S until hormonal signals cause the cell to reenter the cell cycle and divide c. divide continuously and never transition to G0 d. mutate into other cell types by signals from bone marrow cells e. skip anaphase in order to avoid the high likelihood of mutation during this phase of mitosis
Which of the following steps in normal cellular respiration ends with formation of water?
A) glycolysis B) citric acid cycle C) electron transport D) fermentation
Which one of the following statements is TRUE regarding fibrous joints?
A) They are freely movable and can bend and rotate. B) The bones are separated by a fluid-filled cavity that lubricates the joint. C) Fibrous joints present at birth between bones of the skull develop into sutures in the adult. D) The bones are held together by cartilage and tendons. E) They include hinge joints and ball-and-socket joints.