Eukaryotic cells have several structural attributes which separate them from prokaryotes. Which of these attributes are found in eukaryotes, but NOT found in prokaryotes?
A) peptidoglycan walls, cell membrane, nucleoid
B) larger size, organelles, nuclear membrane
C) ribosomes, chromosomes, cytoplasm
D) enzymes, chromatin, DNA
Ans: B) larger size, organelles, nuclear membrane
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Which of the following statements characterize euphylls?
_____ They differ from lycophylls by having a single, unbranched vein rather than a branched vascular system. _____ They are believed to have evolved from a branch that flattened and developed photosynthetic tissue between the branches. _____ They are also called microphylls because they tend to be much smaller than lycophylls. _____ They are the leaf-like photosynthetic structures found among bryophytes. _____ They allow increased photosynthetic ability when compared to lycophylls.
Well-fed individuals who remain hungry are likely
producing excessive amounts of a. leptin. b. ghrelin. c. gastric juice. d. pancreatic hormones. e. cholecystokinin.
There are 61 mRNA codons that specify an amino acid, but only 45 tRNAs. This is best explained by the fact that
A. some tRNAs have anticodons that recognize four or more different codons. B. competitive exclusion forces some tRNAs to be destroyed by nucleases. C. the rules for base pairing between the third base of a codon and tRNA are flexible. D. many codons are never used, so the tRNAs that recognize them are dispensable. E. the DNA codes for all 61 tRNAs but some are then destroyed.
A condition in which the placenta forms in the lower half of the uterus and covers the cervix, which may result in premature birth or maternal hemorrhage, is called ________
A) placenta previa B) colostrum C) cesarean section D) neural tube