To see if a growth-promoting factor was released from blood platelets, cells called fibroblasts were placed in a dish containing liquid cell culture medium
The medium was supplemented
with either serum (collected from blood that had been allowed to clot) or plasma from blood in
which the platelets had not been activated during the clotting process. The number of cells in
each culture is shown in the graph.
Reference: Ref 9-2
How many cells are there on Day 3 in the culture that contains serum?
A. 80,000
B. 800,000
C. 40,000
D. 400,000
B
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The normal functions of Spo11 and Cas9 enzymes are different because
A) Spo11 produces double-strand breaks during meiosis, whereas Cas9 functions during mitosis. B) Spo11 produces site-specific double-strand breaks during meiosis, whereas Cas9 breaks DNA at random genomic locations. C) Spo11 produces double-strand breaks in many genomic locations during meiosis, whereas Cas9 is targeted to specific sequences by a CRISPR RNA. D) Spo11 produces double-strand breaks at sequences targeted by RNAs expressed during meiosis, whereas Cas9 has the ability to recognize DNA sequences without an RNA. E) Spo11 is unique to yeast, whereas Cas9 occurs in most higher eukaryotes.
How does a woody plant widen during secondary growth?
What will be an ideal response?
In which biome of Africa would you find lions, giraffes, and elephants?
a) savanna b) chaparral c) desert d) tropical rain forest
Which of the following lists ranks these molecules in the correct order by size?
A. water, sucrose, glucose, protein B. protein, water, glucose, sucrose C. water, protein, sucrose, glucose D. protein, sucrose, glucose, water E. glucose, water, sucrose, protein