Small, random genetic changes that occur over generations is known as ________.
A. microgenesis
B. anagenesis
C. progenesis
D. degenesis
Answer: B
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Nitrogenase is an oxygen-sensitive enzyme even though many diazotrophs are aerobic microorganisms
Indicate whether the statement is true or false.
These joints are usually highly moveable. They have a fluid-filled capsule of connective tissue
surrounding them.
a. synovial joints b. cartilaginous joints c. fibrous joints d. non-synovial joints e. non-fibrous joints
Which of the following statements is true?
a. The hydrogen bonding of cytosine to guanine is an example of complementary base pairing. b. In DNA, adenine always base pairs with guanine, and cytosine always base pairs with thymine. c. Each of the four nucleotides in a DNA molecule has the same nitrogen-containing base. d. When adenine base pairs with thymine, they are linked by three hydrogen bonds. e. None of these statements are true
Primary plant cell walls are cross-linked by
a. hemicellulose. b. lignin. c. pectin. d. chitin.