« previous next »

Author Question: In 1956 Tijo and Levan first successfully counted human chromosomes. What is the (Read 704 times)

Hungry!

  • Hero Member
  • *****
  • Posts: 1,071
on: Jun 21, 2013
In 1956 Tijo and Levan first successfully counted human chromosomes. What is the reason it took so many years to do so?
A) Watson and Crick's structure of DNA was not done until 1953.
B) Chromosomes were piled up on top of one another in the nucleus.
C) Chromosomes were not distinguishable during interphase.
D) A method had not yet been devised to halt mitosis at metaphase.
E) Chromosomes were piled up on top of one another in the nucleus, chromosomes were not distinguishable during interphase, and a method had not yet been devised to halt mitosis at metaphase.


camila

  • Hero Member
  • *****
  • Posts: 705
Reply #1 on: Jun 22, 2013
100% it's E, don't forget to gimmi a thumbs up :D


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question

Hungry!

  • Hero Member
  • *****
  • Posts: 1,071
Reply #2 on: Aug 13, 2013
Thanks so much, you were right on.


« previous next »
 

Did you know?

The highest suicide rate in the United States is among people ages 65 years and older. Almost 15% of people in this age group commit suicide every year.

Did you know?

The human body produces and destroys 15 million blood cells every second.

Did you know?

When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.

Did you know?

Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.

Did you know?

Glaucoma is a leading cause of blindness. As of yet, there is no cure. Everyone is at risk, and there may be no warning signs. It is six to eight times more common in African Americans than in whites. The best and most effective way to detect glaucoma is to receive a dilated eye examination.

Human body: levels of organization. Human body: levels of organization.
muscles human muscles human
Conservation of synteny between human and mouse Conservation of synteny between human and mouse
Anaphase Centromeres split and daughter chromosomes migrate to opposite poles Anaphase Centromeres split and daughter chromosomes migrate to opposite poles
Human mitotic metaphase chromosomes are identified by size, centromere location, and banding pattern Human mitotic metaphase chromosomes are identified by size, centromere location, and banding pattern
Genome annotation of human chromosome 21 Genome annotation of human chromosome 21
Video: Electromagnetic Spectrum, Chlorophyll and Pigment & Light

For a complete list of videos, visit our video library