Micro Chapter 04

Endospores are usually induced to form when: a) certain nutrients are depleted b) radiation is detected c) water is lost from the cell d) temperatures rise

a) certain nutrients are depleted ????!!! NOT ALL?

Which of the following is true about bacteria? a) All bacteria cells are smaller than 100 micrometers in diameter b) Bacterial endospores are reproductive structures c) The cell wall controls the movement of small molecules into and out of the cell d) Gram negative bacteria become protoplasts when their cell wall is digested away

a) All bacteria cells are smaller than 100 micrometers in diameter

Mitochondria: a) have a double membrane b) are responsible for protein synthesis c) are present only in photosynthetic organisms d) are responsible for converting sunlight to chemical energy

a) have a double membrane

The rough endoplasmic reticulum appears rough because of: a) multiple ribosomes on its surface b) proteins in the lumen of the ER c) sterols in its membrane d) fats and sugars on its surface

a) multiple ribosomes on its surface

Extrachromosomal DNA in prokaryotic cells can be found in the form of: a) plasmids b) mitochondria c) chloroplasts d) chromosomes

a) plasmids

Bacteria which show a wide variety of shapes within a single species are said to be a) pleomorphic b) monomorphic c) axenic d) acellular

a) pleomorphic

Which of the following cellular structures can be found in both prokaryotic and eukaryotic cells? a) ribosomes b) peroxisomes c) Golgi apparatus d) lysosomes

a) ribosomes

Which of the following groups of organisms is not prokaryotic? a) Archaea b) Eukarya c) Eubacteria d) Bacteria

b) Eukarya

Bacteria move by means of: a) whipping back and forth b) flagella c) pili d) cilia

b) flagella

The periplasmic space: a) is found only in Gram positive organisms b) is found between the cell membrane and cell wall c) is found primarily in acid fast bacteria d) is found between the nuclear area and the cell membrane

b) is found between the cell membrane and cell wall

Which of the following cellular structures are found only in prokaryotic cells? a) endoplasmic reticulum b) pili c) nucleolus d) lysosomes

b) pili

Penicillin controls the growth of bacteria by: a) removing cell walls b) preventing peptidoglycan synthesis c) destroying cell membranes d) preventing protein synthesis

b) preventing peptidoglycan synthesis

In bacteria the cell membrane functions in all of the following ways, except: a) synthesizes cell wall components b) serves as the site for protein synthesis c) assists with DNA replication d) regulates movement of materials into and out of the cell

b) serves as the site for protein synthesis

Prokaryotic cells divide by a) meiosis b) mitosis c) binary fission d) mitosis asexually and meiosis sexually

c) binary fission

The Fluid-mosaic model describes the structure of: a) endosymbiotic relationships b) cell walls c) cell membranes d) capsules

c) cell membranes

Genetic information in bacteria: a) is found only in RNA b) is found in the nucleus c) is sometimes found in the form of plasmids d) is found in chromatin (ie DNA condensed by histones)

c) is sometimes found in the form of plasmids

During diffusion, molecules: a) expend energy to move around b) move from hotter areas to cooler areas c) move from areas of higher concentration to areas of lower concentration d) move from areas of lower concentration to areas of higher concentration

c) move from areas of higher concentration to areas of lower concentration

Some bacteria can transfer DNA to another cell using: a) axial filaments b) lophotrichous flagella c) fimbriae d) conjugation pili

d) conjugation pili

The outer (cell) membrane component of the cell wall: a) is primarily a reproductive structure b) is found only in Gram positive bacteria c) is made primarily of peptidoglycan d) contains lipopolysaccharrides

d) contains lipopolysaccharrides

Lysozyme, found in human tears, controls the growth of bacteria by: a) fusing with vacuoles b) containing multiple kinds of digestive enzymes c) preventing peptidoglycan synthesis d) digesting peptidoglycan

d) digesting peptidoglycan