Which element is correctly matched with its major function in plants?
a. phosphorus?alters membrane permeability
b. sulfur?essential part of chlorophyll
c. potassium?opens and closes stomata
d. carbon?maintains turgidity of cells
e. calcium?involved in nitrogen-fixation
c
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Overproduction of _____ causes gigantism
a. growth hormone c. insulin b. cortisol d. melatonin
The human skeleton initially consists of just cartilage, which is replaced by bone, except in areas requiring flexibility. Made of highly resilient, molded cartilage tissue that consists primarily of water. Contains no blood vessels or nerves.
What will be an ideal response?
Antibiotic resistance evolves in bacteria when ________
A) the presence of antibiotics favors bacteria that already have genes for resistance B) farmers do not use enough antibiotics in animal feed C) the antibiotics create resistance genes in bacteria D) none of the above
Which statement defends the concept that the term "gene" is better defined as a nucleotide sequence that encodes for one or more functional products rather than encoding for one or more functional proteins?
A. Products of genes include ribonucleotides as well as proteins. B. Genes in bacteria are organized as operons that can lead to several protein products. C. Intron sequences in DNA do not encode proteins. D. The genetic code is redundant, therefore the same codon may be encoded by different DNA triplets.