Which of the following groups of organisms will all possess hydrostatic skeletons?
A. planaria, hyrdas, crayfish
B. bluegill, lobster and planaria
C. butterflies, cats and clams
D. earthworms, crayfish and sea stars
E. planaria, hydras and earthworms
Answer: E
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Other than the proteins that they encode, what is a major difference between cell-specific and housekeeping genes?
a. Cell-specific genes are expressed only in a single cell type; housekeeping genes are expressed in all cell types. b. Cell-specific genes have promoter proximal elements and enhancers; housekeeping genes have only promoter proximal elements. c. Cell-specific genes have promoter proximal elements that use cell-specific activators; housekeeping genes use "universal" activators. d. Cell-specific genes are only found in certain cell types; housekeeping genes are found in all cell types. e. Cell-specific genes have promoter proximal elements that use "universal" activators; housekeeping genes have promoter proximal elements that respond only to specific activators.
A cross was made between homozygous wild-type female Drosophila and yellow-bodied male Drosophila. All of the resulting offspring were phenotypically wild type
Offspring of the F2 generation had the following phenotypes: Sex Phenotype Number male wild 96 male yellow 99 female wild 197 Based on this information: (a) Is the mutant gene for yellow body behaving as a recessive or dominant gene? (b) Is the yellow locus on an autosome or on the X chromosome?
Which of the following contributes to infection with Trichomonas vaginalis?
A) contact with contaminated fomites B) compromised immunity C) careless handwashing habits D) preexisting disease (chlamydia, for example) E) living in an undeveloped area of the world
In DNA, A, C, G, and T are abbreviations for the:
A) different types of bonds that form between nucleotides. B) different types of sugars on the nucleotides. C) different types of bases on the nucleotides. D) different types of phosphates on the nucleotides. E) types of genes found on DNA chromosomes.