Today, the major danger to species is:
a. hunting by humans.
b. introduction of exotic species.
c. destruction of habitats.
d. predator control.
e. commercial harvesting
c
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The RNA molecules that carry amino acids to the ribosomes during protein synthesis are called ________.
A. ribozymes B. ribosomal RNA C. transfer RNA D. messenger RNA E. primer RNA
Secretion takes up unwanted substances that have been transported out of
a. peritubular capillaries. b. collecting ducts. c. papillary ducts. d. glomeruli. e. Bowman's capsule.
Scientists studying the causes of a type of progressive hearing loss known as otosclerosis want to identify the genetic contribution to the disorder. By which of the following are they most likely to find a causative gene or genes?
A) a genome-wide association study with a large number of SNPs, using pooled DNA samples B) genome-wide linkage analysis studies of families whose members have otosclerosis C) a candidate gene case-control association study with genes known to be involved in ear development D) comparison of gene expression among otosclerosis patients E) allelic heterogeneity studies for a gene expected to be involved
Activation of the complement cascade __________.
A) reduces swelling in affected tissues B) prevents cleavage of complement proteins such as C3 and C5 C) can cause the infecting microbe to be killed by lysis D) can reduce inflammation E) typically reduces the ability of phagocytes to engulf microbes