MICRO EXAM 1 Flashcards


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1

A cell may allow a large or charged chemical to move across the cytoplasmic membrane, down the chemicals electrical and chemical gradients, is a process called

facilitated diffusion

2

Which of the following statements concerning growth and reproduction is false?

A living organism must reproduce to be considered alive.

3

A "9+2" arrangement of microtubules is seen in?

eukaryotic flagella

4

Which of the following is most associated with diffusion?

carrier proteins

5

Which of the following is not associated with prokaryotic organisms?

Cilia

6

Which of the following is true of Svedbergs?

They are an expression of sedimentation rate during high-speed centrifugation.

7

What are cell walls compose of?

peptidoglycan

8

a glycocalyx do not?

form pseudopodia for faster mobility of an organism.

9

Bacterial flagella

are anchored to the cell by a basal body

10

Which cellular structure is important in classifying a bacterial species as Gram-positive or Gram-negative?

cell wall

11

A gram-negative cell is moving uric acid across the cytoplasmic membrane against its chemical gradient. What statement is true?

The acid moves by an active process such as active transport.

12

Gram-positive bacteria

have a thick cell wall which retains crystal violet dye, contain teichoic acids in their cell walls, and appear purple after Gram staining.

13

Endospores

are dormant, resistant cells.

14

Inclusions have been found to contain

sulfur globules

15

Dipicolnic acid is an important component of

endospores

16

Glycocalyx

"Suugar cup" composed of polysaccharides and/or polypeptides.

17

Flagella

Long whip

18

Axial Filaments

Responsible for motility of spirochetes

19

Cilia

Made of tubulin in eukaryotes

20

Fimbriae

Bristlelike projections found in quantities if 100 or more.

21

Pili

Extensions not used for cell motility

22

Hami

Numerous "grappling-hook" projections

23

Ribosome

site of protein synthesis

24

Cytoskeleton

Allows contraction of the cell

25

Centriole

contains microtubules in "9+0" arrangement

26

Nucleus

Site of most DNA in eukaryotes

27

Mitochondrion

Its internal membranes are sites for ATP production.

28

Chloroplast

Light-harvesting organelle

29

ER

Functions as the transport system within a eukaryotic cell

30

Golgi body

Packages large molecules for export from a cell

31

Peroxisome

Contains enzymes to neutralize hydrogen peroxide.

32

What is the function of glycocalyces and fimbriae in forming a biofilm?

They adhere cells to one another and inanimate objects and fimbriae attaches the archaea to surfaces

33

What factors may prevent a molecule from moving across a cell membrane?

size, charge, and polarity