Which of the following is a trace element absorbed by roots?
A. nitrogen
B. phosphorus
C. zinc
D. potassium
Ans: C. zinc
You might also like to view...
When species are kept separate by preventing the formation of hybrid zygotes, the mechanism that keeps the species separate is known as a _____________ isolating mechanism.
A. hybridization B. postzygotic C. prezygotic D. adaptive E. differential
The process by which a nontoxigenic Corynebacterium diphtheriae cell is changed into a toxigenic cell is called:
A) conjugation. B) lysogenic conversion. C) transduction. D) transformation.
Which of the following events occurs during mitosis but not during meiosis?
A) Sister chromatids segregate. B) Homologous chromosomes pair. C) Crossing-over occurs between homologous chromosomes. D) Chromosomes align on the metaphase plate. E) None of the choices is correct.
Attaching an antibody to an antigen so that the antigen cannot attach to anything else is referred to as:
A) agglutination. B) antigen presentation. C) coagulation. D) neutralization.