Plants and algae most recently shared a common ancestor 480 million years ago, and plants colonized land shortly after that. In sexual reproduction, an alga releases gametes into the water and fertilization occurs. What reproductive adaptation did plants evolve on dry land?
A. stomata
B. vascular tissues
C. cuticle
D. pollen
E. lignin
Answer: D. pollen
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The risk of having a baby with Down syndrome is associated with:
A. the age of the mother. B. the health of the mother. C. the socio-economic status of the mother. D. the IQ of the mother. E. All of the answer options are correct.
A lioness begins her nightly hunt after spending the day beneath a tree in the Serengeti. What happens to the blood vessels in her body as she goes from resting to hunting?
A. Arterioles supplying her stomach and intestines contract. B. Arterioles supplying her stomach and intestines expand. C. Arterioles supplying her limb muscles contract. D. Arterioles supplying her limb muscles expand.
Wnt PCP pathway regulates (A)_________ by (B)_____________.
a. (A) cell movement, (B) activating transcription b. (A) proliferation, (B) activating transcription c. (A) cell movement, (B) reorganizing cytoskeleton d. (A) proliferation, (B) reorganizing cytoskeleton
To allow cell wall extension with new peptidoglycan during cell division, preexisting peptidoglycan is severed using ________ to cleave the ?-1, 4 glycosidic bonds
a. autolysins b. crescentins c. transglycosylases d. both autolysins and transglycosylases