What technological advancement was necessary before scientist could begin to observe cells?

What is one drawback of using evidence found in rock layers to determine a relative history of the earth? 1. not all organisms leave fossils 2. not all layers contain salt deposits 3. all areas of earth have distinct rock layers 4.

Which of the chains of amino acids corresponds to the nucleotide sequence aauggcuac

The AUC and AUA codons in mRNA both specify isoleucine. What feature of the genetic code explains this? complementarity nonsense codons universality degeneracy

A mutation may result if the molecule shown is exposed to

What is the central theme and how is that developed In "the story of an hour."

You are called to a private residence to care for a pregnant female that is bleeding vaginally. you estimate that she has lost about 750ml of blood from what you see at the scene. she claims she has no pain.

What observation provides evidence that a cell is most likely a eukaryote

The DNA content of a diploid cell in the G1 phase of the cell cycle is measured. If the DNA content is x, then the DNA content at metaphase of meiosis II would be:

When fish are under water are they dry or they wet.

The minerals in an ingeous rock come from the