Dopamine is a neurotransmitter that causes the brain to feel happy. certain drugs stop the synapses from removing neurotransmitters. when these drugs cause an increase in the amount of neurotransmitters in the synapses, which response would be increased?

a: sleepiness
b: happiness
c: blood production
d: alertness

Which of the following is true of microbes? a. ninety-nine percent of all microbes are pathogenic. b. gene expression in bacteria is very similar to gene expression in humans, which facilitates the use of bacteria in recombinant biotechnology and gene therapy. c. all bacterial enzymes are harmful to humans and the environment. d. microbes create pollutants and toxins that harm the environment.

After fertilization, which type of cellular division is responsible for the growth and development of a complex, multicellular organism?

Punnett squares are used to show possible combinations of alleles or to predict the probability of a trait occurring in offspring. an incomplete dominance cross is performed between a bird that is homozygous for red feathers and a bird that is homozygous for blue feathers. purple offspring result. then, two of the purple offspring are crossed. according to the punnett square for this cross, how many of the offspring from the second cross will have a feather color that results from incomplete dominance? 1 in 4 2 in 4 3 in 4 4 in 4