4.5-4.6

Question 1

DNA and its associated proteins are referred to as

Answer 1

Chromatin

Question 2

Briefly describe the relationship between the nucleus and ribosomes. Your answer include, RNA, protein synthesis

Answer 2

The nucleus contains the DNA that is copied into an mRNA copy. The rRNA is made within the
nucleolus, which is a structure within the nucleus. The rRNA becomes part of a ribosome. The
ribosome then uses the mRNA copy to perform protein synthesis

Question 3

The nuclear envelope has passages for substances moving into and out of the nucleus. Theses passages are called nuclear pores and they are made by proteins that are inserted into the plasma membrane that makes up the nuclear envelope. Theses proteins are assembled by which of the following?

Answer 3

Bond ribosomes

Question 4

Y ou are an evolutionary biologist working for the Smithsonian. On a fossil dig in the Eastern
Montana Badlands, you discover fossil evidence that shows early eukaryotic cells containing only
free ribosomes. Briefly state what conclusion(s) could be drawn from this evidence.

Answer 4

Y ou might infer that early eukaryotic cells mostly made proteins that functioned within the cytosol.