Which of the following is characteristic of complex multicellularity?
A. All cells are exposed to an exterior
surface.
B. The interior cells are tolerant to lower
oxygen levels than exterior cells.
C. Interior cells are exposed to a different
physical and chemical environment than
exterior cells.
D. All cells of complex multicellular organisms
express the same genes.
C
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Four of the five answers listed below are characteristic of monocots. Select the exception
a. flower parts in threes or multiples of three b. pollen grains with one pore c. one cotyledon in the seed d. vascular tissue in the stems arranged in a ring e. parallel veins in the leaf
What is the difference between Ras and the G proteins bound to G protein coupled receptors (GPCRs)?
A. Ras is a small G protein and the G proteins bound to GPCRs are not small G proteins. B. Ras can activate different effector molecules and the G proteins bound to GPCRs cannot activate different effector molecules. C. Ras is a second messenger and the G proteins bound to GPCRs are not second messengers. D. Ras is an enzyme and the G proteins bound to GPCRs are not enzymes.
Which immune cells do not kill other cells directly?
A. B cells B. T cells C. macrophages D. neutrophils
In addition to peptidoglycan, the cell walls of gram-positive bacteria contain
a) mannan. b) teichoic acid. c) cellulose. d) chitin.