A certain dna molecule is determined to have a guanine content of 40 percent. If a rna molecule is synthesized from this particular dna, what percentage of uracil will be in the rna?.

Several bird species feed in a certain species of tree. each bird species feeds in a different part of the tree. which statement is true of these bird species? a. they have adapted to different niches due to competition b. they have a carnivorous relationship with the tree species. c. they have adapted to different niches due to predation d. they have a symbiotic relationship with the tree species.

The nervous system interacts with the endocrine system by a. using hormones as connections b. sending nerve impulses directly to glands c. using neuroendocrine cells as connections d. sending neurotransmitters directly to neurons

Which best describes a gene? a. a sister chromatid b. a chromosome c. a tetrad d. a piece of a chromosome