Which of the following populations would you expect to have the most genetic diversity within the group?
A. A true-breeding stock of tomato plants
B. The F1 generation of tomato plants from
the cross of two different true-breeding stocks
C. A stock of tomato plants that is not true
breeding
C
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Answer the following statements true (T) or false (F)
1. One function of cell walls in plants is to prevent the continual increase in the expansion of the cell membrane. 2. The plant cell can move substances into cells using proton pumps that work against a gradient. 3. Diffusion of water across membranes occurs through channels formed by proteins known as aquaporins. 4. Active transport in plants works against a concentration gradient and this allows for substances to pass through plant cells without an energy input. 5. If your plants are wilted, this is an indication that the turgor pressure in cells of that plant are low.
The rate of diffusion across a selectively
permeable membrane will be slow when which of the following is (are) true? I. concentration gradients are steep II. temperatures are low III. solutes are small molecules
a. I only b. II only c. I and III d. II and III e. I, II, and III
An exergonic reaction results in a net gain of free energy
__________________ Indicate whether the statement is true or false.
What are cytokines?
A) alert hormones that trigger the body to prepare for injury by shrinking capillaries and increasing platelet production B) enzymes that promote the replication and gathering of leukocytes C) carbohydrates which reduce inflammation in the body D) signaling proteins that help cells communicate with each other, initiating and coordinating immune actions E) organic chemicals which stimulate fever via an increase in metabolism