Heterotrophs must obtain organic molecules that have been synthesized by
A. biogeochemical cycles.
B. autotrophs.
C. decomposers.
D. bacteria.
Answer: B
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Which of the following is a characteristic of
the plasma membrane?
a. it controls the contents of the cell b. the main lipid of a cell membrane is cholesterol c. carbohydrates carry out most of the cell’s dynamic functions d. it encloses a jellylike mixture called a cytoplastic reticulum e. all of these are characteristics of plasma membranes
A(n) ____ allows two rival males to assess one another’s strengths without engaging in a potentially damaging fight
a. conditioned stimuli b. eusocial response c. instinctive behavior d. kinetic movement e. threat display
A deletion may set up a genetic circumstance where a recessive gene is expressed in an otherwise diploid organism
Indicate whether the statement is true or false
If there are 20 chromatids in a cell, how many centromeres are there?
A) 10 B) 20 C) 30 D) 40 E) 80