Which process involves an increase in entropy of the system?
A) freezing of ice
B) any spontaneous process
C) combustion of paper
D) formation of raindrops
E) synthesis of cellulose
C) combustion of paper
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The text states that antibiotics are derived from microorganisms. What is the benefit to an antibiotic-producing microorganism of producing an antibiotic in its natural habitat?
What will be an ideal response?
Which of the following statements is NOT
correct about osmosis and plant cells?
a. Water tends to diffuse from soil into young plant cells, thus creating an osmotic pressure. b. Turgor pushes against the cell walls from the outside, so it keeps the cells plump. c. If the concentration of solutes becomes higher in the soil than in plant cells, water molecules will tend to diffuse out of plant cells. d. The cytoplasm of plant cells would typically contain more solutes than soil water. e. Osmosis is the diffusion of water molecules across the plasma membrane of plant cells.
In a chemical reaction, substrate molecule A is broken down to form one molecule of product B and one molecule of product C. The equilibrium constant, K, for this reaction is .5. If we start with a mix containing only substrate A at a concentration of 1M, what will be the concentration of A when the reaction reaches equilibrium?
A.) 0.667 M B.) 0.333 M C.) 0.250 M D.) 0.500 M E.) 0.125 M
Considering the age of the various segments of an annelid such as an earthworm,
a. They are born with all segments present and these merely grow in size; this allows segment count to be a major feature in their identification b. New segments are added just behind the prostomium, so the oldest segments are at the posterior end c. New segments are added just in front of the pygidium, so the oldest segments are at the anterior end d. Each segment doubles several times in life so all of the segments are half or one-fourth "new" at any one time e. Segments grow and duplicate in a haphazard fashion preventing their use in identification