Which of the following would form the fewest covalent bonds?
A) hydrogen (one electron in the first shell) B) neon (eight electrons in the second shell)
C) carbon (four electrons in the second shell) D) oxygen (six electrons in the second shell)
Answer: B
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Brittany and Jarod have been trying to have a second child for 10 years. They have one healthy child, but Brittany has had four early, spontaneous abortions. The most likely explanation for the many pregnancy losses is that Brittany and Jarod
A) are not having sex frequently enough. B) are each heterozygous for lethal alleles of the same gene. C) are each homozygous for lethal alleles of the same gene. D) have different alleles for all of their vital genes.
In an aqueous environment, how are the phospholipids of a membrane arranged?
a. in a single layer b. in a bilayer, with the fatty acid tails located at the surface c. in a bilayer, but the phospholipids have no specific orientation d. in a bilayer, with the polar heads of each layer located at the surface
What do the Gram stain, acid-fast stain, and endospore stain have in common?
A. used on a wet mount of the specimen B. use heat to force the dye into cell structures C. outcome based on cell wall differences D. use a negative stain technique E. are simple stains
Explain the tetranucleotide hypothesis and its relationship to the substance referred to as nuclein
What will be an ideal response?