Transgenic animals are currently used ________
A) to produce potentially useful proteins
B) as food
C) as vectors for use in cloning human DNA
D) all of the answer options are correct
A
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The extracellular matrix in animals:
A. is located exclusively in connective tissue. B. is formed by many types of cells, primarily fibroblasts, on their cell surfaces. C. is a meshwork of insoluble fibrous proteins, primarily collagens, that assemble in a double helix. D. differs from one tissue to the next, affecting the expression of genes in the cells that it surrounds. E. is attached to cells by integrin junctions.
Early in development, female mammalian embryos convert an X chromosome in each cell into an inactivated form. What is this form called?
a. neutral X b. odontoid process c. Barr body d. axial body
Population increase is most influenced by ____
a. percentage of humans in the pre-reproductive and reproductive age groups b. number of individuals in the post-reproductive age groups c. percentage of individuals in the reproductive age groups d. number of women in the reproductive age groups e. number of men in any age group
The role of the postsynaptic neuron in neural communication is to ____
a. release neurotransmitters b. use gated calcium channels c. contain synaptic vesicles d. block the action of neurotransmitters e. receive the signal from the presynaptic cell