Which statement describes chromosomes?

a. Chromosomes are always spread out as chromatin.
b. Chromosomes are always condensed.
c. Homologous chromosomes have the same genes but can have different alleles.
d. Homologous chromosomes always have the same alleles.


e. Chromosomes always consist of two sister chromatids.


ANSWER: c

Biology & Microbiology

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Fluzone is a brand name for a very commonly given influenza vaccine.  The vaccine is prepared by first harvesting flu viruses in chicken embryos and then breaking apart virus particles into protein subunits, thereby inactivating the virus. Your friend refuses to get the vaccine.  Which of these statements is the only valid reason for her not to get the flu vaccine? 

A. She could die from the vaccine. B. She could pass the virus onto her baby, causing the child to become autistic. C. She could catch the flu from the inactivated vaccine. D. She is allergic to eggs.

Biology & Microbiology

Given what you now know, what information is most likely to produce the correct answer?

What will be an ideal response?

Biology & Microbiology

Which of the following is NOT dependent on

the others as a food supply?

a. carnivores b. herbivores c. producers d. detritivores e. decomposers

Biology & Microbiology

Nauplius, a unique kind of larva, is characteristic of

A. mites. B. chelicerates. C. insects. D. crustaceans. E. horseshoe crabs.

Biology & Microbiology