Which of the following is(are) specialization(s)
that evolved in land plants that was(were)
unnecessary in their aquatic ancestors?
a. xylem
b. phloem
c. stomata
d. roots
e. all of these
E
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A bacterial cell must have ___________ in order to transfer portions of its chromosome to another cell.
A. an F factor B. a high frequency of combination plasmid C. a recombination factor D. growth enhancement genes E. all of these components
The molting process exhibited in animals such as nematodes and arthropods is referred to as ecdysis
a. True b. False
Nonvascular plants include mosses, liverworts, and hornworts. They are usually just a few cells thick and grow close to the ground. What can plants that have vascular tissue do that plants lacking vascular tissue cannot do?
A) absorb nutrients and minerals from the soil B) transport materials such as water and sugars C) reproduce D) carry out photosynthesis
A common occurrence for nursing mothers is "milk let-down," which stimulates the mother's mammary glands to eject milk. Which hormone is responsible for the milk letdown reflex?
A) Follicle-stimulating hormone (FSH) B) Prolactin C) Estrogen D) Oxytocin E) Progesterone