34 Consider a culture medium on which only gram positive

Last updated: 9/20/2023

34 Consider a culture medium on which only gram positive organisms can grow due to the presence of sodium azide and a yellow halo surrounds the growth of organisms that ferment lactose decreasing the pH as a result and changing the color of a pH indicator in the media What best describes this media a This media would be considered selective b This media would be considered differential c This media would be considered differential because of the addition of sodium azide and selective because of the presence of a pH indicator and the fermentable carbon source d This media would be considered selective because of the addition of sodium azide and differential because of the presence of a pH indicator and the fermentable carbon source 35 Abby was incubating her culture of Bacillus amyloticus at 20 C for 24 hours she then moved the culture to a different incubator which was set at 37 C and left the culture there for another 24 hours Which of the following changes might occur in the cell membrane in response to the temperature change a The organism will insert additional hopanes into the cell membrane b The organism will replace long chain fatty acid chains with short chain fatty acids chains c The organism will replace saturated fatty acid chains with unsaturated fatty acid chains cis double bond d The organism will replace cyclized fatty acid chains with unsaturated fatty acid chains cis double bond 36 The image below illustrates a cell membrane which contains a transporter protein There are two different molecules represented by a square and a circle both molecules carry a single positive charge Which of the following describes a system which the square molecule is moved against its concentration gradient using energy provided by the movement of the circle molecule in an active transport system Outside the cell Inside the cell DO a The square and the circle molecule would both move from the inside the cell to the outside of the cell b The square and the circle molecule would both move from the outside of the cell to the inside of the cell c The square moves from inside the cell to the outside of the cell coupled to the circle molecule moving from outside to inside The square moves from outside of the cell to the inside of the cell coupled to the circle