What hormone regulates milk production in mammals?
A. growth hormone
B. prolactin
C. thyroid-stimulating hormone
D. adrenocorticotropic hormone
E. luteinizing hormone
B. prolactin
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Sperm mature in the
a. epididymus. b. seminal vesicles. c. vas deferens. d. prostate gland. e. bulbourethral gland
What is the right sequence of steps during infection of plants by nitrogen-fixing bacteria?
A) Nodule forms; infection thread grows into the root cortex; rhizobia proliferate inside of root hair; rhizobia release flavonoids and Nod factors. B) Rhizobia release Nod factors; roots release flavonoids; rhizobia proliferate inside of root hair; infection thread grows into the root cortex; nodule forms. C) Roots release flavonoids; rhizobia release Nod factors; rhizobia proliferate inside of root hair; infection thread grows into the root cortex; nodule forms. D) Rhizobia release flavonoids; roots release Nod factors; rhizobia proliferate inside of root hair; infection thread grows into the root cortex; nodule forms. E) Roots release flavonoids; rhizobia release Nod factors; rhizobia proliferate inside of root hair; nodule forms; infection thread grows into the root cortex.
Structures that are shed in one piece include
a. the cuticle of roundworms. b. the exoskeleton of arthropods. c. human hair. d. all of the above.
A tropical forest and desert are examples of
A. biospheres. B. biomes. C. populations. D. ecosystems. E. communities.