Which gland secretes melatonin?
a. thyroid
b. pancreas
c. pineal
d. parathyroid
e. liver
ANSWER: c
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Choanoflagellates are single-celled eukaryotes that feed on bacteria. The presence of their food bacteria causes these cells to cluster into multicellular structures in which the individual choanoflagellate cells are attached to one another
Based on this observation, it may be assumed that: A. the bacterial cells, or a chemical released by the bacteria, bind to a receptor on the plasma membrane of the choanoflagellate cells. B. the choanoflagellate cells use cadherins to attach to each other. C. the choanoflagellates use integrins to attach to each other. D. choanoflagellates are complex multicellular organisms because they alternate between single cell and multicellular states.
The gametophyte of most liverworts is referred to as:
a. a seta. b. gemmae. c. a thallus. d. a frond. e. a prothallus.
This is a name for a group of conditions that make it difficult to breathe. This group of conditions is most commonly caused by smoking
A) influenza B) tuberculosis C) chronic obstructive pulmonary disease D) asthma
Biologists can use sequence information to identify open reading frames. How can these open reading frames be identified in a genomic sequence for protein coding genes?
a) by the nuclear matrix attachment regions b) by the start and stop codons for translation c) by the centromeric and telomeric regions d) by the repetitive sequences such as short tandem repeats e) by transposons