The basement membrane is made of

a. connective tissue.
b. epithelial tissue.
c. adipose tissue.
d. proteins and polysaccharides.
e. carbohydrates and lipids.


D

Biology & Microbiology

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In a mutant E. coli strain, there was a mutation in the malate dehydrogenase gene that resulted in a stop codon at amino acid position 14. From subcultures of this strain, a colony was obtained that was capable of making malate dehydrogenase. Your approach to examining this phenomenon should be to examine

A) the DNA sequence to see if a reversion has occurred. B) the DNA sequence to see if a suppresor mutation has occurred. C) other proteins to see if other stop codons are ignored, indicating the presence of a suppresor tRNA. D) the DNA and plasmids for the incorporation of a second complete copy of the malate dehydrogenase gene. E) all of the above

Biology & Microbiology

____________________ proteins function in the packaging of DNA in the chromosome. Fill in the blank(s) with the appropriate word(s)

Biology & Microbiology

For most reptiles, fertilization is __________ and they are __________

a. external; ovoviviparous b. external; oviparous c. internal; ovoviviparous d. internal; oviparous e. external; viviparous

Biology & Microbiology

Which organelle is NOT a part of the endomembrane system?

a. the endoplasmic reticulum b. the lysosome c. the nucleolus d. the Golgi complex

Biology & Microbiology