Many people with Marfan syndrome have limbs, fingers, and toes that are disproportionately long in relation to the rest of the body. However, it is the weakened heart valves and damage to the major blood vessels that are often deadly. Which tissue type is weakened with people with this syndrome?


Answer: Connective tissue

Biology & Microbiology

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In eukaryotes, genetic material is packaged tightly in the nucleus. Which one of the following most accurately lists the components in order of increasing size (i.e., from smallest to largest)?

A. nucleotide, DNA duplex, chromatid, nucleosome, chromosome B. chromosome, nucleosome, chromatid, DNA duplex, nucleotide C. chromosome, chromatid, nucleosome, DNA duplex, nucleotide D. nucleotide, DNA duplex, nucleosome, chromatid, chromosome E. nucleotide, nucleosome, DNA duplex, chromatid, chromosome

Biology & Microbiology

The most efficient lungs with respect to oxygen uptake are found in this group of vertebrates. 

A. amphibians B. birds C. fish D. mammals E. reptiles

Biology & Microbiology

Retrotransposons reverse the effects of transposons.

a. true b. false

Biology & Microbiology

Endosperm tissue of angiosperms has what ploidy level?

A. 2n B. 4n C. 8n D. 3n E. n

Biology & Microbiology