Jenny is beginning first grade. Everyday, the teacher walks into the classroom and loudly smacks a ruler on the desk, causing the children to jump. The teacher develops a habit of clearing
her throat, “Uhmmm,” and then slamming down the ruler. Soon all the teacher has to do is clear her throat and the children jump.

Label the following for this scenario:
a. Unconditioned Stimulus (US)
b. Conditioned Stimulus (CS)
c. Unconditioned Response (UR)
d. Conditioned Response (CR)

Why do rna viruses appear to have higher rates of mutation? a) rna nucleotides are more unstable than dna nucleotides.b) replication of their genomes does not involve proofreading.c) rna viruses can incorporate a variety of nonstandard bases.d) rna viruses are more sensitive to mutagens.

In 2009, a flu pandemic was believed to have originated when viral transmission occurred from pig to human, thereby earning the designation, "swine flu." although pigs are thought to have been the breeding ground for the 2009 virus, sequences from bird, pig, and human viruses were all found within this newly identified virus. what is the most likely explanation of why this virus contained sequences from bird, pig, and human viruses? a) the virus was descended from a common ancestor of bird, pig, and human flu viruses.b) the infected individuals happened to be infected with all three virus types.c) related viruses can undergo genetic recombination if the rna genomes mix and match during viral assembly.d) the human was likely infected with various bacterial strains that contained all three rna viruses.

You should expect adults to respect you in return. true false