________ mutations decrease or eliminate gene activity

Fill in the blank(s) with correct word


Loss-of-function

Biology & Microbiology

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The bacterium Deinococcus radiodurans is able to withstand the damage incurred by exposure to very high levels of ? irradiation. This exposure introduces many double-stranded breaks that are repaired within hours

Which of the following is a key component of this rapid repair mechanism? A. RecA B. extended synthesis-dependent strand annealing (ESDSA) C. synthesis-dependent strand annealing (SDSA) D. double-strand break repair (DSBR) E. XerCD

Biology & Microbiology

Which of the following can help researchers determine if two genes are homologous to each other?

A. Punnet square B. simple dot matrix C. quadratic equation D. polypeptide structure E. geometric analysis

Biology & Microbiology

Impulses conducted along the muscle fiber's transverse tubules stimulate the release of calcium ions into the cytoplasm  

A.  from the Z line. B.  from the actin and myosin subunits. C.  from the troponin. D.  from the sarcoplasmic reticulum. E.  from the extracellular fluid in the neuromuscular junction.

Biology & Microbiology

A crossover that would result in genetic recombination (e.g., A b c or a B C) could involve which pair of chromatids? (Select all that apply.)

Consider a pair of homologous chromosomes heterozygous for three genes (e.g. A B C / a b c) during prophase I of meiosis. Let the sister chromatids of one homolog be numbered 1 and 2; and the sister chromatids of the other homolog be numbered 3 and 4. A) 1 & 2 B) 3 & 4 C) 1 & 3 D) 2 & 4 E) 1 & 4 F) 2 & 3

Biology & Microbiology