Which type of plant hormone is primarily responsible for the growth of a floral stalk in rosette plants
such as cabbages?
a. salicylic acid
b. cytokinins
c. ethylene
d. gibberellins
e. brassinosteroids
D
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A mechanism for penicillin resistance in bacteria is
A) acetylation of the antibiotic. B) phosphorylation of the antibiotic. C) confirmation change of the antibiotic. D) splitting the ?-lactam ring of the antibiotic.
________ are a group of cytokines produced by some eukaryotic cells in response to a viral infection.
Fill in the blank(s) with the appropriate word(s).
The fact that a nucleic acid is a very complicated molecule suggests that
A. sophisticated enzymes were not present or available to synthesize it. B. RNA could not have arisen on its own by chance, but required enzymes to guide the synthesis of nucleotides and then nucleic acids. C. no natural system could ever generate it. D. the protein-first hypothesis is therefore the only plausible hypothesis. E. the RNA-first hypothesis is impossible.
Bone-forming cells are called _____, while cells that dissolve bone, releasing calcium and phosphorus, are _____
osteoclasts; osteoblasts osteocytes; osteoclasts osteoblasts; osteoclasts osteoclasts; osteocytes