How do the genes in the ?-globin locus differ from each other?
A) They use different template strands for transcription.
B) They are expressed at different times in development.
C) They evolved from different ancestral genes.
D) They are dispersed on different chromosomes.
E) Some are expressed in all cells; others are expressed only in red blood cell precursors.
B) They are expressed at different times in development.
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Which of the following pairs is incorrectly matched for cells and the molecules they secrete?
A. Neutrophils; heparin B. Basophils; heparin C. Mast cells; histamine D. Natural killer cells; toxic chemicals E. Eosinophils; toxic chemicals
Primitive reptiles first appeared during the _____ period.
A. Carboniferous B. Cambrian C. Devonian D. Ordovician E. Silurian
If you count 24 chromosomes in a body cell, how many chromosomes would you expect to see in the sperm cell of the organism?
1.6 2.12 3.24 4.30
Which of the following algal groups is the most diverse?
a. red b. green c. golden d. blue-green