Describe the organization of a human chromosome

What will be an ideal response?


A chromosome at its most condensed has the DNA packed into tightly coiled coils. When the coiled coils unwind, a molecule of chromosomal DNA and its associated proteins are organized as a cylindrical fiber. A loosened fiber will look like "beads-on-a-string.". The "string" is the DNA molecule; each "bead" is the nucleosome. A nucleosome consists of part of a DNA molecule looped twice around a core of histone proteins.

Biology & Microbiology

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The study of genomes is known as ____

a. genomics b. genomorphology c. bionomics d. biomapping e. genosequencing

Biology & Microbiology

In males, sterilization involves a vasectomy, which removes a portion of what structure?

A. Epididymis B. Sertoli cells C. Vas deferens D. Seminiferous tubules

Biology & Microbiology

Arsenic poisoning can lead to organ failure and death. Though arsenic can inhibit or interfere with a number of cellular enzymes, arsenic poisoning is thought to be mainly due to indirect inhibition of enzymes involved in both pyruvate oxidation and the Krebs cycle. As a result, this compound must be able to enter which cellular compartment?

A. the intermembrane space of the mitochondria B. the nucleus C. the endoplasmic reticulum D. the cytoplasm E. the mitochondrial matrix

Biology & Microbiology

During crossing over in meiosis, an unequal exchange of genetic material occurs. This would most likely produce

A. a deficiency in one homologue and an inversion in the other homologue. B. a reciprocal translocation. C. a duplication in one homologue and an inversion in the other homologue. D. a deficiency in both homologues. E. a deficiency in one homologue and a duplication in the other homologue.

Biology & Microbiology