What is a gene?

A. A section of DNA that codes for a portion of a protein
B. A discrete sequence of DNA nucleotides
C. A section of DNA that codes for one or more proteins
D. All of these and more are part of the expanding definition of a gene.


Answer: D

Biology & Microbiology

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How do transcription repressors work?

a. They bind to the same sequence where activators normally bind. b. They bind to and disable the activator. c. They recruit histone acetylation enzymes and thus interfere with chromatin remodeling. d. They bind to RNA polymerase II and prevent it from binding to the transcription factor complex e. They methylate DNA.

Biology & Microbiology

In which cavity does the human heart lie?

a. thoracic b. pelvic c. abdominal d. cranial e. spinal

Biology & Microbiology

The structure that absorbs and transduces light

energy is indicated by a. A. b. B. c. C. d. D. e. E.

Biology & Microbiology

Fluorescent in situ hybridization (FISH) would be helpful in determining

A) the location of B-DNA and Z-DNA. B) the position and structure of nucleosomes. C) the position of particular chromosomes or sequences inside the nucleus. D) the base composition of a DNA sample. E) the number of nuclear pores on the nuclear envelope

Biology & Microbiology