The rod-shaped (chlamydias/brucella/rickettsias) are intracellular parasitic members of the alphaproteobacteria
What will be an ideal response?
rickettsias
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Which of the following statements is true regarding the anterior pituitary gland? Select all correct choices
A. It houses neurosecretory cell axons B. It is derived from neural tissue C. It is the target of releasing factors D. It is derived from epithelial tissue E. It produces tropic hormones
The main purpose of creating Flavr Savr tomatoes was ________
A) to make larger tomatoes B) to make tomatoes ripen faster C) to make tomatoes rot-resistant D) to make tomatoes taste better E) to improve the vitamin A content of tomatoes
Living cells typically have biosynthetic pathways to synthesize at least some of the amino acids used in making proteins. Some strains of E. coli, a prokaryote, can synthesize the amino acid tryptophan, while other E. coli strains cannot. Similarly, some strains of the yeast S. cerevisiae, a eukaryote, can synthesize tryptophan, while other S. cerevisiae strains cannot. Which of the following describes the most likely source of genetic variation found in the tryptophan synthesis pathways of both species?
(A) Exchange of genetic information occurs through crossing over. (B) Viral transmission of genetic information required to synthesize tryptophan occurs. (C) Random assortment of chromosomes leads to genetic variation. (D) Errors in DNA replication lead to genetic variation.
The chromatin structure in eukaryotic cells is much more complicated than that observed in prokaryotic cells. This is thought to be the reason that DNA replication occurs much faster in prokaryotes. How much faster is it?
(a) 2× (b) 5× (c) 10× (d) 100×