Gravity-sensing mechanisms of many organisms are

based on
a. spicules.
b. statoliths.
c. uric acid crystals.
d. sclereids.
e. nematocysts.


Answer: b

Biology & Microbiology

You might also like to view...

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.

Biology & Microbiology

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

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology