The structure of DNA and RNA are similar in that
(A) both molecules are made of the same 5-carbon sugar
(B) both molecules are composed of the same 4 nitrogenous base
(C) the nucleotides of both molecules contain a phosphate group
(D) both molecules are double stranded which are antiparallel in directionality
Answer: (C) the nucleotides of both molecules contain a phosphate group
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Evidence that black walnut trees exhibit allelopathy includes
A. the lack of vegetation growing under black walnut trees. B. the death of hornworms that try to eat black walnut leaves. C. the symbiotic relationship the trees have with fungi. D. the ants that protect the trees from herbivory. E. the morphological changes that occur in response to pathogenic attacks.
In an F+ × F- mating, all or part of the host chromosome usually is transferred to the recipient.
Answer the following statement true (T) or false (F)
Some flowers bloom in the spring, while others bloom in the summer. This is an example of reproductive isolation.
A. prezygotic B. sympatric C. allopatric D. parapatric E. postzygotic
The following figure presents the genotypes of individuals at three different points in time (t = 0, t = 4, t = 32). What effect of genetic drift does this figure demonstrate?
What will be an ideal response?