In last week's lab we performed an experiment to see whether or not termites orient to the lines of black ink pens. In this experiment, _____ was the dependent variable and _____ was the independent variable.
A. Orientation of termites, presence of ink
B. Time termites spend on side A, number of termites
C. Presence of ink, orientation of termites
D. Presence of ink, time termites spend on side A
E. Time termites spent on side A, presence of ink
Ans: E. Time termites spent on side A, presence of ink
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When crossover occurs, the result is:
A. 4 chromosomes, all nonrecombinant. B. 4 chromosomes: 3 nonrecombinant and 1 recombinant. C. 4 chromosomes: 2 nonrecombinant and 2 recombinant. D. 4 chromosomes: 1 nonrecombinant and 3 recombinant. E. 4 chromosomes, all recombinant.
Acetylation
a. adds an acetyl group (CH3CO?) to the cytosine nucleotides of DNA. b. adds an acetyl group (CH3CH2?) to the DNA of a promoter sequence. c. adds an acetyl group (CH3CO?) to the histone protecting the transcription unit of a gene. d. adds an acetyl group (CH3CO?) to the histone protecting the promoter region of a gene. e. adds an acetyl group (CH3CH2?) to the RNA polymerase that will initiate transcription at the promoter region.
After which Period did the last mass extinction
occur?
a. Permian b. Triassic c. Jurassic d. Ordovician e. Cretaceous
Receptors for activated complement proteins are found on ____
a. dendritic cells, macrophages, and neutrophils b. mast cells, macrophages, and neutrophils c. dendritic cells, B lymphocytes, and neutrophils d. dendritic cells, eosinophils, and macrophages e. monocytes, T lymphocytes, and B lymphocytes