In the process of blood clotting, which of the
following do platelets do?
a. engulf and digest cellular debris
b. release substances that repel more platelets
c. convert fibrin into fibrinogen
d. clump together
e. platelets do all of these
D
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Cells in cartilage that produce ground substance are called ________
Fill in the blank(s) with correct word
A localized group of organisms that belong to the same species is called a _____
A) community B) population C) ecosystem D) family
Telomere maintenance in cancer cells is the result of
A) natural cell aging. B) active telomerase activity. C) the exchange of DNA between chromosomes. D) viral infection. E) Both B and C result in telomere maintenance.
When a bacterium is introduced to a new environment that is an appropriate medium for that species to grow, fission allows a rapid expansion of the population (2-4-8-16-32-64... etc). But there is usually a slight lag before the bacteria actually begin building up such a logarithmic growth curve. What is the best explanation?
A. It takes time for sub-cellular units to evolve the ability to digest new media B. A bacterium is not actively producing all the enzymes it can code for, and it takes time to induce and amplify the production of the currently needed enzymes C. Binary fission becomes more and more efficient D. A new media dissolves away repressor proteins E. Structural genes act more slowly than metabolic genes