You identify a new unicellular organism with multiple chromosomes organized by proteins within the cell's nucleus. Into which of the three domains of life might this organism fit?
A) Archaea
B) Bacteria
C) Eukarya
D) Archaea or Bacteria
E) Archaea or Eukarya
C
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Filopodia and lamellipodia are associated with which cytoskeletal element?
a. microfilaments b. microtubules c. intermediate filaments d. chromatin e. cellulose. microtubules.
Many gastropods have external shells composed of:
a. two valves. b. eight overlapping valves. c. a series of internal chambers. d. one valve. e. chitin.
Most polyploid species arise from
A) a single diploid parent plant. B) a single triploid parent plant. C) a single tetraploid parent plant. D) the hybridization of two parent species.
HIV, the virus which causes AIDS, interacts with two receptors on the host cell membrane: CD4 and CCR5. A small percentage of individuals have a genetic mutation which causes their cells to lack CCR5. These individuals will never develop AIDS nor are
they able to pass HIV on to others. Which part of viral replication is being blocked by the lack of a receptor? A) The virus components cannot be assembled into new virions. B) Endocytosis is being prevented. C) Newly assembled virions cannot be released from the host cell. D) The host cell enzymes are unable to replicate the HIV genome. E) HIV cannot attach to the host cell without the proper membrane receptor.