Histone modification occurs only during early development

A. true
B. false


B

Biology & Microbiology

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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.

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology

________ marks the end of a gene and causes transcription to stop

A) A stop codon B) RNA ligase C) A terminator D) Methionine

Biology & Microbiology