Monosaccharides may be characterized by all
EXCEPT which of the following?
a. a ketone group
b. carbon, hydrogen, and oxygen in a 1:2:1 ratio
c. a backbone of five to six carbon atoms
d. one aldehyde group
e. the presence of glycerol and fatty acids
Answer: e
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Recent research suggests that a homing pigeon can navigate to its home coop from any direction by using ____ as
their compass and ____ as their map.
a. the position of the Sun; olfactory cues b. the position of the stars;other visual cues c. olfactory cues; the position of the stars d. olfactory cues; the position of the Sun e. landmarks; olfactory cues
Four of the five answers correctly describe trends in plant evolution. Select the exception
a. nonvascular to vascular b. sporophyte dominant to gametophyte dominant c. motile to nonmotile gametes d. seedless to seeds e. haploid to diploid dominance
How do mitosis and meiosis differ from each other?
A) The goal of mitosis is to produce cells that are genetically identical to the original parent cell; the goal of meiosis is to produce cells that contain twice the number of chromosomes as the original parent cell. B) The cells formed by mitosis are diploid; the cells formed by meiosis are haploid. C) Mitosis results in the production of gametes; meiosis results in the production of cells, which are used for the organism's growth and replacement of damaged cells. D) Synapsis and crossing over occur in mitosis to ensure new combinations of genetic material; synapsis and crossing over do not occur in meiosis.
Kelp forests along the Pacific Coast are in decline. You are a scientist studying potential causes for this de-cline. Kelp (a form of brown algae) is eaten by two species of sea urchins
The first urchin species is native to the Pacific, whereas the second species is an exotic species that was in-troduced from the Atlantic by human activity. The introduced urchins currently occur only near the seaports where they were first introduced, but they are expanding their geographic range. Sea otters prey on sea ur-chins. Sea otters were driven almost to extinction by hunting, but are now re-colonizing the Pacific coast. You conduct the following experiments and make the following observations: • Kelp forests thrive in areas with sea otter populations except in areas where introduced sea ur-chins overlap with the sea otters. • Removing sea urchins by divers results in kelp growth. • When you census the sea urchin populations, you find that native sea urchins tend to outnumber exotic sea urchins except in areas where otters are present. • When you enclose a single species of sea urchins with kelp in the field, you find that native sea urchins consume kelp at twice the rate than the exotic urchins. Indicate the net impact on population numbers that the first species has on the second species in this food web by using the following symbols: 0 = no impact, + positive impact, – negative impact. Exotic sea urchin (1)________ kelp Native sea urchin (2)________ kelp Sea otter (3)__________ exotic sea urchin Sea otter (4) __________ native sea urchin Native sea urchin (5) ____________ exotic sea urchin What is the future of the kelp forests? Justify your statement. What will be an ideal response?