Which of the following are water-conducting cells that are dead at functional maturity?
A) parenchyma cells
B) collenchyma cells
C) tracheids and vessel elements
D) sieve-tube elements
C
Biology & Microbiology
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In the synthesis of amino acids the addition of the amino nitrogen usually occurs ________ the synthesis of the carbon skeletons.
Fill in the blank(s) with the appropriate word(s).
Biology & Microbiology
The most diverse group of arthropods is the
A. insects. B. chelicerates. C. myriapods. D. crustaceans. E. hemichordates.
Biology & Microbiology
Work by Charles Darwin and Francis Darwin was instrumental in the discovery of ____
a. auxins b. brassinosteroids c. jasmonates d. cytokinins e. gibberellins
Biology & Microbiology
In recombinant DNA techniques, the gaps in the paired DNA fragments are closed by ____
a. restriction enzymes b. DNA ligase c. DNA polymerase d. DNA replicase e. reverse transcriptase
Biology & Microbiology