Which best describes the structure of DNA?

A. Alleles held together by genes

B. A tetrad with two sister chromatids

C. Nucleic acids arranged in a double helix

D. Chromosomes linked in a loop

How can scientists determine the absolute age of a rock sample?

Describe what substances must pass through to diffuse into cells

Was there any noticeable effect on the germination rate of the radish seeds as a result of the ph? compare and contrast the growth rate for the control with the alkaline (sodium bicarbonate) and acidic (vinegar) solutions?

A researcher is using a compound microscope with an eypiece magnification of 10X. He is using the high power magnification (40X) to examine the mitochondria of liver cells.

Which stars will eventually form black holes? Small stars Medium-sized stars Very massive stars All stars

Explain why most quartz is useful?

What is the pattern of expression for autosomal genes?

The process by which the particles of a gas randomly pass through a tiny opening is called

What is an unusual defense some lizards have developed to protect themselves?

What types of cells have half the number of chromosomes?