Vascular endothelial growth factor (Abbreviated as VEGF and pronounced "Veg-F") is a peptide-signaling molecule related to platelet-derived growth factor
VEGF is important in the
formation of the circulatory system because its signaling pathway causes the formation of
new blood vessels in developing embryos during normal development. It also causes the
formation of new blood vessels that supply tumors when the tumor produces and secretes
VEGF. Given what you know about the different kinds of cell signaling and about VEGF,
which of the following is true?
What will be an ideal response?
Answers will vary.
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Placing celery sticks in fresh water will make them more turgid and harder. This is because
A. the celery is hypotonic to fresh water. B. the celery is hypertonic to fresh water. C. the celery is isotonic to fresh water. D. water moves from the celery sticks into fresh water. E. salt moves from the water into the celery sticks.
Suppose you explored a new planet and found a photosynthetic organism unlike any on Earth. You
repeat Engelmann's classic experiment using this new organism in place of Spirogyra and find that oxygen-dependent bacteria cluster near the green and yellow portions of the spectrum. What does this tell you?
a. The sun of this new planet emits different wavelengths of light than our own. b. This new organism is using yellow and green light to drive photosynthesis. c. This organism is green just like plants on Earth. d. This organism utilizes the most energy-rich photons of the spectrum. e. This new organism is using blue and red light to drive photosynthesis.
Proteins are composed of subunits called ____ linked together by chemical bonds
a. nucleotides b. polynucleotides c. mRNAs d. amino acids
e. proteasomesTo date, most of our natural antibiotics have been found to be produced by members of what genus?
A) Streptomyces B) Bacillus C) Penicillium D) Paenibacillus E) Cephalosporium