Giardiasis involves
A. vector transmission.
B. infection of the large intestine.
C. symptoms of abdominal pain, flatulence, and diarrhea.
D. a protozoan that does not form cysts.
E. All of the choices are correct.
Answer: C
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The B-I mutation in anthocyanin (red pigments) produces pigmented corn plants, whereas the B? mutation in the same gene usually produces nearly unpigmented corn plants when homozygous (B ´/B ´). When homozygous B-I and B? plants are intercrossed
, the F1 plants are essentially unpigmented, like the B? homozygotes. If this outcome were due simply to the dominance of B? to B-I, then a self-cross of the F1 plants (B ´/B-I) should generate B-Iâ€"colored homozygotes as approximately 1/4 (B-I/B-I) of the F2 progeny. Instead, no F2 are pigmented. Intercrosses of the F2 and of further generations do not restore the pigmented phenotype. What is the term for this type of inheritance? A) Mendelian inheritance B) organelle genome inheritance C) allelic inheritance D) epigenetic inheritance
The ovaries are regulated by the____
a. anterior pituitary b. posterior pituitary c. hypothalamus d. presence of environmental estrogens e. gonadal hormones
What is the radula's function in mollusks?
A. It is the location for most of the internal organs. B. It extracts oxygen from surrounding water. C. It helps the mollusk move. D. It cuts and scrapes up food.
Which of the following elements is a macronutrient in plants?
a. sodium b. calcium c. manganese d. zinc e. copper What will be an ideal response?