In Drosophila, the hunchback gene encodes a protein (HB) that has a role in the development of the thorax. In the zygote and embryo, the expression of hunchback is stimulated by high concentrations of Bicoid protein. Which of the following is accurate about the expression of hunchback in the Drosophila embryo?
A. The HB protein is produced in the middle of the embryo; but is not produced in the anterior or posterior end.
B. The HB protein is produced only in the anterior half of the embryo.
C. The HB protein is produced throughout the embryo.
D. The HB protein is produced only in the posterior half of the embryo.
E. No HB protein is produced in the embryo.
Answer: B
You might also like to view...
Which of the following is a fitness trade-off (compromise)?
A) In some hornbill species, the male helps seal the female in a tree with her nest until the young are ready to fledge. B) Hummingbirds are the best pollinators of certain flowers, but bees are the best pollinators for orchids. C) The strong, thick beak of a woodpecker helps it find insects in trees. D) Turtle shells provide protection but are heavy and burdensome when moving.
Skeletal muscle contraction is largely dependent on calcium ions that enter the cell from:
A. the extracellular space. B. the sarcoplasmic reticulum. C. the T tubule. D. the Z disc.
Referring to the above diagram, which
structure is responsible for storing bile?
a. F b. G c. H d. I e. J
Prolonged sitting decreases production of _____, which facilitates removal of harmful lipids from the blood.
A. lactase B. ADP C. ATP D. lipoprotein lipase E. phosphates