Transposons are part of a class of DNA known as
a. nonrepetitive DNA.
b. moderately repetitive DNA.
c. SNPs.
d. minisatellites.
e. highly repetitive DNA.
Ans: b
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The basal lamina:
A. is a specialized extracellular matrix found beneath epithelial tissues. B. surrounds endothelial cells found in blood vessels. C. is a collagen-rich extracellular matrix D. links to epithelial cells through hemidesmosomes, which attach to intermediate filaments. E. All of these choices are correct.
A variable trait in corn is the presence or absence of knobs at particular sites on some chromosomes. The allele present on each chromosome determines whether or not that chromosome has a knob. Suppose that one member of each of two pairs of homologs in a corn plant has a knob. If this plant is crossed with a knobless plant, what percentage of the offspring is expected to have only knobless chromosomes?
A) 100% B) 75% C) 50% D) 25% E) 0%
The image in the above photograph is a prime example of ____
a. double mutualism b. associative commensalism c. interference competition d. team predation e. parasitism
Each human kidney contains about a million ________, which are the tubular functional units of the kidney.
A. renal medullae B. flame cells C. nephrons D. nephridia E. ureters