Testosterone is an example of a chemical signal that affects the very cells that synthesize it, the neighboring cells in the testis, along with distant cells outside the gonads. Thus, testosterone is an example of ________.

 I) an autocrine signal

 II) a paracrine signal

 III) an endocrine signal

#Question id: 11954

#I Life Science/ Life Sciences Group – I-V

Folic acid supplements have become especially important for pregnant women because ________.

#Question id: 3653

#SCPH06 I Botany

Cyclobutane pyrimidine dimers are formed by -------------from adjacent pyrimidines on one strand by cyclization of the double-bonded C5 and C6carbon atoms of each base to give a cyclobutane ring.

#Question id: 9151

#SCPH28 | Zoology

What would be the effect on climate in the temperate latitudes if Earth were to slow its rate of rotation from a 24-hour period of rotation to a 48-hour period of rotation?

#Question id: 1398

#SCPH06 I Botany

Which of the following properties is (are) characteristic of a benign tumor?

a. well differentiated              b. localized to tissue of origin             c. metastatic               

d. promotes angiogenesis        e. surrounded by a fibrous capsule

#Question id: 1427

#SCPH28 | Zoology

 In females, all the cells in a tumor have the same inactive X chromosome. The reason for this is that: