Breathing is most directly controlled by (the)
A. heart.
B. lungs.
C. diaphragm.
D. conscious thought.
C. diaphragm.
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DNA-binding proteins interact predominantly within which portion of a double-stranded DNA helix?
A) major groove B) minor groove C) 3' end D) supercoil
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 throughout the embryo. B. The HB protein is produced only in the anterior half of the embryo. C. The HB protein is produced only in the posterior half of the embryo. D. The HB protein is produced in the middle of the embryo; but is not produced in the anterior or posterior end. E. No HB protein is produced in the embryo.
The characteristic long and narrow “pipe-like” sporophyte that emerges from the parent gametophyte is characteristic of which type of seedless plant?
a. liverworts b. hornworts c. mosses d. ferns
Blood vessels called ___ carry blood away from the heart.
Fill in the blank(s) with the appropriate word(s).