What term describes the shape of a DNA molecule? single helix double helix single strand double zipper

What are the four letters of the rna alphabet

what are the two modes through which the hypothalamus causes the release of hormones by pituitary gland?

How long ago do scientists believe the continents formed Pangaea? about 135 million years ago about 180 million years ago about 300 million years ago about 4.5 billion years ago

If you flip a penny, the chance of it turning up heads is?

What type of succession takes place when there is no existing biotic community or soil to begin with? a. primary succession b. secondary succesion c. tertiary succession d. none of these

How are stock speculators different from stock investors?

A condition called an aneurysm occurs when a

Which one of the following molecules is a by-product of cellular respiration? a. Glucose b. Oxygen c. Pyruvate d. Water

What substances, present in fruits and vegetables, provide significant health benefits such as reducing the risk of cancer?

Which structures are common to both prokaryotic and eukaryotic cells? check all that apply. vacuole cell membrane golgi body ribosome cytoplasm endoplasmic reticulum?