When an ionic compound such as sodium chloride (NaCl) is placed in water, the component atoms of the NaCl crystal dissociate into individual sodium ions (Na+) and chloride ions (Cl-). In contrast, the atoms of covalently bonded molecules (e.g
, glucose, sucrose, glycerol) do not generally dissociate when placed in aqueous solution. Which of the following solutions would be expected to contain the greatest number of solute particles (molecules or ions)? A) 1 liter of 0.5 M NaCl
B) 1 liter of 1.0 M NaCl
C) 1 liter of 1.0 M glucose
D) 1 liter of 1.0 M NaCl and 1 liter of 1.0 M glucose will contain equal numbers of solute particles.
B
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Signal recognition particles (SRPs) are associated with the Sec translocation system.
Answer the following statement true (T) or false (F)
The main reason why the numbers of black-footed ferrets decreased rapidly is
a. decreased populations of prairie dogs. b. decreased numbers of whitebark pine berries. c. habitat disruptions. d. hunting
Genes at one locus that affect the expression of genes
at a different locus are said to be a. epistatic. b. linked. c. codominant. d. penetrant. e. alleles.
A current leading hypothesis about the first system of inheritance in the earliest life-forms involves
A) self-replicating DNA molecules. B) self-replicating RNA molecules aided by ribozymes. C) proteins that served as templates for RNA molecules, leading to the formation of DNA. D) self-replicating polypeptides aided by ribosomes.