What type of microscope is specially modified with an ultraviolet radiation source and a filter?

A) bright-field
B) dark-field
C) phase-contrast
D) fluorescent


Ans: D) fluorescent

Biology & Microbiology

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What muscular disorder is characterized by a progressive weakening of the muscle cells due to a faulty gene on the X chromosome?

a. Polio b. Tetanus c. Muscular dystrophy d. Amyotrophic lateral sclerosis e. Botulism

Biology & Microbiology

Molecular chaperones assist in the folding of newly synthesized mRNAs

__________________ Indicate whether the statement is true or false.

Biology & Microbiology

If an allele is dominant, then:a

its phenotype is only expressed in heterozygous individuals. b. its phenotype is expressed only in homozygous individuals.. c. one allele can mask the expression of a recessive allele in a hybrid. d. its phenotype is always expressed in all generations. e. its phenotype is more beneficial than the recessive phenotype.

Biology & Microbiology

What are the sources of sulfur in the atmosphere?

A) Mostly (over 90%) volcanoes and photosynthetic bacteria B) Mostly transportation modes, such as autos, trucks, and planes C) Volcanoes and hot springs, but mostly (about 75%) human activities such as burning coal D) Decomposition and small amounts from pollution E) Natural and human sources, in equal amounts

Biology & Microbiology