Histone modification occurs only during early development
A. true
B. false
B
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Which of the following is the strongest evidence for
the idea that present-day eukaryotic aerobes are the descendants of the successful symbiotic association of anaerobes and aerobes? a. Mitochondria can produce ATP. b. A mitochondrion can survive indefinitely when removed from a eukaryotic cell. c. A mitochondrion has its own set of DNA molecules. d. Fossilized mitochondria are older than the oldest fossilized eukaryotes. e. All eukaryotic cells have mitochondria.
Which of the following accurately describes the structure of fibrous proteins?
A) Fibrous proteins usually contain a number of different domains with different structural motifs. B) Fibrous proteins are composed of an equal mixture of ? helices and ? sheets with interconnecting looped segments. C) Fibrous proteins have an extensive tertiary and quaternary structure that affects the strength and elasticity of each fiber. D) Fibrous proteins have a simple primary structure and very little secondary structure, resulting in long, thin fibers. E) Fibrous proteins are usually composed of either ? helices or ? sheets throughout the molecule, giving them a highly ordered, repetitive structure.
The sex of most mammals, birds, and insects is determined by:
a. the temperature. b. the external environment. c. sex chromosomes. d. chance. e. the internal environment
________ marks the end of a gene and causes transcription to stop
A) A stop codon B) RNA ligase C) A terminator D) Methionine