Mixe 300 Ray midherm exam / vers March 1, 2018 Which is (are) true concerning th
ID: 214349 • Letter: M
Question
Mixe 300 Ray midherm exam / vers March 1, 2018 Which is (are) true concerning the cell wall of prokaryotes? A. It determines the shape of the bacteria.C B R prevents the bacteria from bursting. C Ih contains D ghoocayx EAll of the choices are true A. is the ingestion of particles and may be performed by animal cells. lls. B is the ingestion of particles and may be performed by bacteria. be performed by bacteria AND animal ce Cthc ingestsion of particles and may D is the secretion of proteins E is the formation of a lysosome 10. Most solutes pass through the cytoplasmic membrane via A osmosis. B. diffusion C transport proteins D. secretion Chapter 4 Dynamics of Prokaryotie Growth I1. All the bacterial cells that result from the replication of a single original bacterial organism are said to be A. population. B, pure culture. C. lag culture. D, mutant culture. 12. Prokaryotic cells divide by a process known as A. conjugation. B. mitosis. C. binary fusion. D. binary fission. E. divergence. 13. During which phase of growth are bacteria most susceptible to antibiotics? A. Lag B. Stationary C. Exponential (log) D. Decline 14.Concerning the bacterial growth curve, which of the following statements is true? A. Production of primary metabolites is greatest during stationary phase. B. Production of secondary metabolites is greatest during stationary phase. 15. A urine sample with more than 100,000 organisms is considered indicative of infection. A urine sample containing 5,000 bacteria, with a generation time of 30 minutes, sits for 3 hours before finally being asayed. How many bacteria will then be present within the sample? A. 10,000,Explanation / Answer
8. E. All of the above choices are true.
Prokaryote are bacteria and cyanobacteria. Their cell wall is made up of peptidoglycan. Cell wall is a hard rigid structure which prevent them from bursting. Some antibiotics like penicillum prevents cell wall synthesis in bacteria.
9. A. Phagocytosis is the ingestion of particles and may be performed by animal cells.
Animal cells have cell membrane as the outer covering which is flexible. So, they can ingest solid particles by enclosing them.
10. C. Transport proteins.
When molecules are large or charged, they are carried towards concentration gradient by transport proteins which carry specific molecules. When molecules move against concentration gradient, then also they are carried by specific transport proteins.
11. B. Pure culture.
12. C. Binary fission.
Binary fission is a process in which the cell divides into two and the genetic material is equally distributed to the two daughter cells.
13. C. Exponential phase.
It is rapid multiplication phase when new cells form. Cell wall and proteins are synthesized.
14. B. Production of secondary metabolites is greatest during stationary phase.
After the lag phase when the resources are exhausted, the stationary phase starts during which, bacteria produces some substances which are not involved with growth or reproduction of bacteria. These are called secondary metabolites.
15. 5000 X 26 = 320000 bacteria.