What is true about a strand of DNA? Question 5 options:

A. It contains many genes

B. It contains many proteins

C. It contains many strands of mRNA

D. It contains many chromosomes

I tried the last one, " It contains many chromosomes" and " It contains many strands of mRNA" and they were both wrong so its either A or B

The probability of producing a normal child by two parents who are carriers for an autosomal recessive disorder is

What is the difference between the conducting zone and the respiratory zone of the respiratory system? the conducting zone is a series of cavities and tubes that move air to the respiratory zone where gases exchange with the bloodstream. the conducting zone exchanges gases between the lungs and the alveoli and the respiratory zone is a series of cavities and tubes that move air to the conducting zone. the conducting zone moves oxygen into the cells and the respiratory zone takes carbon dioxide away from the cells. the conducting zone moves oxygen into the bloodstream and the respiratory zone takes carbon dioxide away from the bloodstream.

According to the cladogram, which organisms have roundworms as a common ancestor?