Book 1 Ch 3 - Tour of the Cell

Question 1

Electron microscope of bacteria - how are nucleus and cytoplasm shown

Answer 1

Nucleus is pale, cytoplasm is dark (many ribosomes)

Question 2

Types of cytoskeletal proteins

Answer 2

Microfilaments
Microtubules
Intermediate filament

Question 3

Explain microfilaments

Answer 3

Thinnest
molecules of actin (protein) in long helical chains
linked in bundles
Mostly around cell edges
in microvilli of digestive system and in leading edge of moving cells (they assemble and disassemble)

Question 4

Explain microtubules

Answer 4

Made of tubulin (protein)
Alpha and beta cells
Cell shape and movement
radiate from centrosome in animal cells

Question 5

Explain intermediate filaments

Answer 5

Between diameter of other 2
Several kinds of protein
Role is to prove mechanical strength

Question 6

What is chromatin

Answer 6

DNA and histones complex (DNA woudl round Histones)

Question 7

Types of chromatin

Answer 7

Heterochromatin (viewed as dark) - more highly condensed

Euchromatic (viewed as paler) - more genes - more transcriptionally active