Which of the following regulates paracellular transport?
A) adherens junctions
B) gap junctions
C) desmosomes
D) tight junctions
E) hemidesmosomes
Answer: D
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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. The genetic code is redundant, therefore the same codon may be encoded by different DNA triplets. C. Genes in bacteria are organized as operons that can lead to several protein products. D. Intron sequences in DNA do not encode proteins.
Variations in rates of growth for different parts of the body are referred to as:
a. allometric growth patterns. b. adaptive growth patterns. c. allopatric growth patterns. d. allopolyploidy. e. preadaptations
Which statement describes how the electron shells of sodium (Na)-11 electrons- are filled?
A) 2 electrons in the first shell and 9 electrons in the second shell B) 2 electrons in the first shell, 8 electrons in the second shell, and 1 electron in the third shell C) 4 electrons in the first shell, 4 electrons in the second shell, and 3 electrons in the third shell D) 11 electrons in the first shell E) 8 electrons in the first shell and 3 electrons in the second shell
Which of the following statements about the nitrogen cycle is false?
a) Ammonification converts organic nitrogenous matter from living organisms into ammonium (NH4+). b) Denitrification by bacteria converts nitrates (NO3-) to nitrogen gas (N2). c) Nitrification by bacteria converts nitrates (NO3-) to nitrites (NO2-). d) Nitrogen fixing bacteria convert nitrogen gas (N2) into organic compounds.