Kohler and Lipton first discovered a growth factor (PDGF) by:
A. observing that fibroblasts could not grow in
cell culture without adding PDGF to the
growth medium.
B. observing that fibroblasts could not grow in
cell culture without adding bovine blood
serum to the growth medium.
C. observing that fibroblasts grew better in
cell culture when blood serum was added to
the growth medium instead of blood plasma.
D. observing that fibroblasts could not grow
and repair wounding without the action of
platelets.
E. observing that fibroblasts could not grow in
cell culture without the addition of purified red
blood cells.
C
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Which of the following groups of microorganisms produces antibiotics?
A. Penicillium B. Streptomyces C. Bacillus D. Penicillium AND Streptomyces E. All of the choices are correct.
In the vicinity of the equator, air warmed by solar radiation rises
Indicate whether the statement is true or false
How do the sugars that are formed by photosynthesis in leaves travel to underground storage structures?
A) through xylem B) through phloem C) through meristem D) through ground tissue
Review: During transcription, _______ , which is a _____, makes a mRNA copy of the DNA.
A. RNA polymerase; lipid B. RNA polymerase; enzyme C. Ribosomes; protein D. Nucleus; enzyme