The organisms that occupy the first trophic level near hydrothermal vents are:
a. detritivores
b. chemoautotrophic bacteria
c. decomposers
d. photosynthetic bacteria
e. photosynthetic algae
b
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DNA varies from species to species in
a. how much adenine binds with thymine rather than with cytosine. b. whether DNA is a double or a single helix. c. the variation in the backbone structure. d. how many different bases it contains. e. its sequence of DNA base-pairs
Saliva contains the enzyme __________, which begins the process of starch digestion. Fill in the blank(s) with the appropriate word(s)
In prokaryotes, the production of a single RNA transcript for a group of related genes is under the control of ________
A) an operon B) enhancers C) a signal transduction pathway D) transcription factors
Most herbivorous animals do not have the ability to digest the cellulose in plants. What mechanism has evolved in the absence of this ability that allows them to survive despite eating only plant matter?
A) production of saliva containing amylase B) digestion by symbiotic microorganisms C) avoidance of plants containing cellulose D) converting cellulose to other carbohydrates in the animal's own cells