In the common daisy, genes A and B control flower color. Both genes have a dominant allele (A or B) and a recessive allele (a or b). At least one copy of each dominant allele is required for flowers to be colorful instead of white. Predict the genotypes and phenotypes of the F1 progeny of a cross between two white-flowered plants, one homozygous for A and the other homozygous for B.
A) AA bb, white
B) aa BB, white
C) Aa Bb, colorful
D) Aa Bb, white
E) aa bb, colorful
C) Aa Bb, colorful
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A. Both gymnosperms and flowering plants contain vascular tissues. B. All plants except bryophytes contain vascular tissues. C. All plants contain vascular tissues. D. Only flowering plants contain vascular tissues.
An enzyme binds its substrate at the active site
__________________ Indicate whether the statement is true or false.
Which one of the following is the most efficient long-term source of ATP for muscle cells?
A) creatine phosphate B) ready-made ATP in the cell C) aerobic respiration of glucose D) fermentation of glucose E) aerobic respiration of proteins
T cells that react with self antigens are destroyed through:a
cytokinesis. b. macrophages. c. perforins. d. apoptosis. e. receptor mediated endocytosis