Some of your DNA may not code for any protein and has no known function in gene regulation; it is sometimes referred to as noncoding DNA. How do nucleotide sequences of "noncoding DNA" evolve?
A) They evolve through natural selection.
B) They evolve through genetic drift and other chance processes.
C) They evolve to be more useful by taking on new functions.
D) They evolve by gradually being eliminated from the gene pool.
Answer: B
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The figure above represents the dynamics of _____
A) metapopulations B) extinction C) emigration D) both metapopulations and extinction E) both extinction and emigration
What is the relationship between operators, transcription units, and operons?
a. Operators are comprised of transcription units and operons. b. Operons are comprised of transcription units and operators. c. Operators are comprised of multiple transcription units associated with a single operon. d. Operons are comprised of multiple operators associated with a single transcription unit. e. Operons are comprised of multiple transcription units associated with a single operator.
By _____, researchers had established the location and arrangement of actin and myosin in _______
muscle.
a. 1924; striated b. 1954; striated c. 1924; smooth d. 1994; smooth e. 1904; smooth
Answer the following questions true (T) or false (F)
1. Root hairs develop into taproots. 2. Stomata allow carbon dioxide into a leaf and water vapor out. 3. Most stomata are found on the top surface of a leaf.