The mother of these progeny resulted from a cross between two flies from true-breeding lines. What are the genotypes of these two lines?
In Drosophila, the autosomal recessive pr and cn mutations cause brown and bright-red eyes, respectively (wild-type flies have brick-red eyes). Flies who are homozygous recessive at both pr and cn have orange eyes. A female who has wild-type eyes is crossed to an orange-eyed male. Their progeny have the following distribution of eye colors:
A) pr cn+ / pr cn+ and pr+cn / pr+cn
B) pr+cn+ / pr+cn+ and pr cn / pr cn
C) pr+cn+ / pr cn and pr cn / pr cn
D) pr+cn / pr cn and pr cn+ / pr cn
E) More than one of these could be true.
A) pr cn+ / pr cn+ and pr+cn / pr+cn
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Protein kinase is an enzyme that _____
A) functions as a second messenger molecule B) serves as a receptor for various signal molecules C) activates or inactivates other proteins by adding a phosphate group to them D) produces second messenger molecules
The sequence of the messenger RNA molecule (primary transcript) synthesized from a DNA molecule with a coding strand having the sequence 5' ATGCTACCGTTA is:
A. 5' UACGAUGGCAAU. B. 5' UAACGGUAGCAU. C. 5' AUGCUACCGUUA. D. 5' AUUGCCAUCGUA. E. None of the choices given is correct.
The discovery that some bacteria ____ using enzymes that cut the viral DNA into pieces was one of the first steps in the development of recombinant DNA technology
a. exchange fused plasmid DNA b. restrict important nutrients from leaving the bacterial cell c. resist viral infection d. cut up and recycle mRNA transcripts e. attach amino acids to tRNA molecules
The resident microflora that can colonize the bladder and other structures of the urinary tract are:
a. Enterobacteriaceae. b. yeast. c. Propionibacterium acnes. d. Corynebacteria.