Drosophila mutations such as bcd, if homozygous in the mother, produce offspring with lethal defects, no matter what the genotype of the offspring. For some other genes, the mutant phenotype can be "rescued" by introducing a wild-type allele
What is the reason for these different outcomes? A) Non-rescuable mutations are of paternal origin.
B) Rescuable mutations act as dominants.
C) bcd is a maternal effect mutation.
D) Rescue requires recombination between the maternal and introduced alleles.
E) bcd is a Hox gene.
C
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You put a solution of sucrose into a bag of dialysis tubing, which is permeable to water but not to sucrose. You then put this bag into a beaker of water. An hour later, you observe that the bag has swelled due to
A. the high osmolarity of the surrounding water. B. passive transport of sucrose molecules. C. the osmotic pressure of the sucrose solution. D. the pressure exerted on the bag by the surrounding water. E. active transport of water molecules. Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about the movement of water? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Hydrogen ions enter the extracellular fluid from all
EXCEPT a. amino acid breakdown. b. lysis of water. c. lactate formation. d. protein degradation. e. fermentation.
Which hormone stimulates Leydig cells?
a. testosterone b. FSH c. LH d. GnRH e. hCG
What does the liver not do
What will be an ideal response?