Concept 6.3: The eukaryotic cell’s genetic instructions are housed in the nucleus and carried out by the ribosomes

Question 1

contains most of the genes in the eukaryotic cell.

Answer 1

nucleus

Question 2

encloses the nucleus (Figure 6.9), separating its contents from the cytoplasm.

Answer 2

encloses the nucleus (Figure 6.9), separating its contents from the cytoplasm.

Question 3

a netlike array of protein filaments (in animal cells, called intermediate filaments) that maintains the shape of the nucleus by mechanically supporting the nuclear envelope.

Answer 3

nuclear lamina

Question 4

structures that carry the genetic information.

Answer 4

chromosomes

Question 5

A prominent structure within the nondividing nucleus is the, which appears through the electron microscope as a mass of densely stained granules and fibers adjoining part of the chromatin

Answer 5

nucleolus (plural, nucleoli

Question 6

complex of DNA and proteins making up chromosomes is called

Answer 6

chromatin

Question 7

complexes made of ribosomal RNAs and proteins, are the cellular components that carry out protein synthesis

Answer 7

ribosomes

Question 8

includes the nuclear envelope, the endoplasmic reticulum, the Golgi apparatus, lysosomes, various kinds of vesicles and vacuoles, and the plasma membrane.

Answer 8

endomembrane system

Question 9

sacs made of membrane

Answer 9

vesicles

Question 10

extensive network of membranes that it accounts for more than half the total membrane in many eukaryotic cells

Answer 10

endoplasmic reticulum (ER)

Question 11

is so named because its outer surface lacks ribosomes.

Answer 11

smooth ER

Question 12

is studded with ribosomes on the outer surface of the membrane and thus appears rough through the electron microscope.

Answer 12

rough ER