A skeletal system would include all of the following except:a
myofilaments.
b. a shell.
c. a fluid-filled compartment.
d. a system of bones.
e. an exoskeleton.
A
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Each of the following statements is true for Toxoplasma gondii except that
A. it can cause stillbirth. B. infection often fatal for AIDS patients. C. it is a flagellated parasite. D. it has a narrow host range.
Imagine that you are searching for the gene associated with nail-patella syndrome, a dominant genetic disorder that causes developmental abnormalities. In a large pedigree you discover an association between nail-patella syndrome and a genetic marker that
occurs in two different alleles, A and B. Fifteen individuals within this pedigree have nail-patella syndrome and are A/B heterozygotes for the marker. Thirty individuals within this pedigree don't suffer from nail-patella syndrome and are homozygous for the A marker allele. One individual within this pedigree has nail-patella syndrome and is also homozygous for the A marker allele. The most likely explanation for this exceptional individual is that _____. A) a new mutation converted the disease-causing allele to the wild-type form B) a new mutation converted the B allele of the marker to the A form C) the exceptional nail-patella individual is haploid D) recombination occurred between the nail-patella gene and marker locus in one of the parents of the exceptional individual
Which of the following accounts for vision loss in sufferers of glaucoma?
A. intraocular pressure buildup due to poor drainage of the aqueous humor B. loss of photoreceptors in and around the fovea C. protein accumulation in the lens D. detachment of the retina from the outer part of the eye E. poor control of extraocular muscles
Proton pumps within the electron transport chain transport H+ ions __________.
a. from intermembrane space to cytoplasm
b. from cytoplasm to matrix
c. from matrix to intermembrane space
d. from matrix to cytoplasm