Which of the following are the fundamental embryonic tissues called the "germ layers"?
A. Tissues, organs, and organ systems
B. Mesoderm, exoderm, and hydroderm
C. Ectoderm, endoderm, and exoskeleton
D. Mesoderm, muscle, and tissue
E. Mesoderm, endoderm, and ectoderm
Answer: E
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Among the easiest of the mutations to isolate are those which
A. involve haploid chromosomes. B. involve antibiotic resistance. C. allow populations to be measured. D. use an indirect method for measurement. E. involve haploid chromosomes AND involve antibiotic resistance.
A population that is growing exponentially in the absence of limiting factors can be illustrated by which curve?
a. S-shaped b. J-shaped c. one that terminates in a plateau phase d. bimodal e. binomial
How do birth control pills prevent fertilization?
A. They alter the uterine environment so that sperm cannot survive. B. They prevent follicle development and ovulation. C. The provide hCG, indicating that fertilization has already occurred. D. They inhibit menstruation. E. They prevent implantation.
The role of environmental factors on gene expression is illustrated by ____.
A. the varying plant height of genetically identical yarrow plants when grown at different elevations B. the flower color of hydrangeas C. the coloration in snapdragon plants D. male-pattern baldness E. genetic variety in eye color