A plant has undergone a robust phase of growth; however, the roots reach a point where they can no longer provide enough nutrients to the plant. What signal(s) can the roots send to the rest of the plant that will prevent new branches from forming?
Select all correct
choices.
A. cytokinins
B. gibberellic acid
C. strigolactone
D. ethylene
C
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The secretory systems of Type III and Type IV pathogenic bacteria differ in their mode of attacking cells in which of the following ways?
A. Type III systems bind to the cellular membrane by slimy mucilage and toxins diffuse across the membrane, whereas Type IV systems infect materials using pili as transfer tubes. B. Type IV systems bind to the cellular membrane by slimy mucilage and toxins diffuse across the membrane, whereas Type III systems infect materials using pili as transfer tubes. C. Both systems attach to cells in the same way but they differ merely in the chemicals that they inject into the host cell. D. Type III systems use flagella modified as "syringes" to inject materials into cells they are infecting whereas Type IV systems use modified pili as transfer tubes. E. Type IV systems use flagella modified as "syringes" to inject materials into cells they are infecting whereas Type III systems use modified pili as transfer tubes.
Which of the following is NOT an example of the
results of mitosis? a. a pair of identical twins b. a group of rooted plant cuttings from a single plant c. the cells produced by the asexual reproduction of a single-celled organism d. the offspring produced by two parents e. healing of a wound
Sex-linked human diseases do not occur in females.
a. true b. false
Properties of effective antigens include all the following, except
A. large polymers made up of identical repeating subunits. B. foreign to the immune system. C. cells or large, complex molecules. D. large molecules with a minimum molecular weight of 1,000. E. molecular complexity.