Gravity-sensing mechanisms of many organisms are
based on
a. spicules.
b. statoliths.
c. uric acid crystals.
d. sclereids.
e. nematocysts.
Answer: b
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What is this phenomenon called and what affect does this mutation have on
GGG and GGC are codons for the amino acid, glycine. A mutation caused the insertion of a cytosine in place of the guanine during DNA replication. Over many generations the DNA changes so that the frequency of GGC is similar to that of GGG.
A. directional selection; that has resulted in genetic uniformity in the species.
B. a bottleneck effect; decreases the number alleles in the population.
C. stabilizing selection; that reduced genetic diversity within the species.
D. adaptive variation; resulting in reduced genetic diversity in females because the GGC coded for bright feather color instead of the mottled brown feather color coded for by GGG.
E. neutral variation; the change in genetic code does not cause a change in phenotype therefore there is no change in reproductive success. This mutation then does not affect the population.
If a round cell doubles in size, its volume increases
about __________ times while its surface area increases about __________ times. a. 2; 4 b. 4; 16 c. 8; 64 d. 8; 4 e. 16; 8
Population growth typically slows down when populations reach carrying capacity because
A. predation pressure is reduced. B. abundant resources reduce competition. C. density-independent mortality increases. D. resource limitation decreases birth rates.
For each of the following sentences, fill in the blanks with the best word or phrase selected from the list below
Not all words or phrases will be used; each word or phrase should be used only once. The specialized functions of different membranes are largely determined by the __________________ they contain. Membrane lipids are __________________ molecules, composed of a hydrophilic portion and a hydrophobic portion. All cell membranes have the same __________________ structure, with the __________________ of the phospholipids facing into the interior of the membrane and the __________________ on the outside. The most common lipids in most cell membranes are the __________________. The head group of a glycolipid is composed of __________________. amphipathic hydrophobic phosphatidylserine cholesterol lipid bilayer phospholipids fatty acid tails lipid monolayer proteins glycolipids lipids sterols hydrophilic head groups phosphatidylcholine sugars