What qualities would you expect to observe in this lake?
1.lots of nutrients
2.more phytoplankton than algae
3.high biomass in the profundal zone
4.lots of oxygen at all levels
4
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Differentiation refers to the process by which:
A. fertilized eggs undergo multiple rounds of cell division to become embryos. B. changes in gene expression allow cells to produce the correct proteins at the correct time. C. cells become progressively more specialized during development. D. gene regulation determines which proteins are produced in a given cell during development. E. None of these choices are correct.
Infections that are acquired during sexual activity are referred to as:
a. endogenous infections. b. pyelonephritis. c. exogenous infections. d. upper tract infections.
How are humans able to produce billions of unique B and T cell receptors?
a. Each time a pathogen is encountered, a new receptor is produced. b. The two different genes that encode receptor proteins, allow for many versions of receptors to be produced. c. Random splicing of gene segments encoding receptor proteins allows for 2.5 billion potential combinations. d. Antigen presenting cells stimulate B and T cells to each produce billions of receptor molecules. e. There are billions of B and T cells, each of which produces a single receptor on its cell surface.
A target molecule that is _____ will always cause cell death.
a) inactivated b) damaged c) hit d) ionized