Question 6 (4 points) The median square A dose is the amount of pathogen/toxin that causes active square A in 50% of hosts, and the median square A dose is the amount that causes 50% of hosts to be square A

Geralda is listing all the conditions under which natural selection occurs. So far, she has listed: 1. The environment changes 2. Organisms in a population have different traits. Which other condition should she include in her list? All organisms in the population adapt and reproduce. The environment returns to normal after some time. The environment can support only new organisms. Only some of the organisms survive and reproduce.

A neuron receives an EPSP near the axon hillock and an IPSP on the far side of the neuron cell body. The potentials are the same magnitude. Which of the following is the most likely outcome? The two potentials will combine via temporal summation The two potentials will cross each other out and nothing will happen The cell will likely be inhibited An action potential may be generated

The skin eliminates waste containing perspiration. Select the correct response: True False

When muscle cells can't get enough oxygen, they perform lactic acid fermentation instead of cellular respiration. True False

In bacteria and eukaryotes, a mutation is when __ the expression of a gene changes without the DNA sequence being changed the nucleotide sequence in a DNA molecule is directly changed the amino acid sequence in a protein molecule is directly changed DNA is unable to be replicated the nucleotide sequence in an mRNA molecule is directly changed

The dermis contains melanocytes. False True

The final product of the Calvin Cycle stage of photosynthesis is glucose. True False

Starches and sugars found in food micronutrients Proteins Nutrition RDA unit pricing minerals lipids carbohydrates enriched foods cholesterol

A cell in a hypotonic solution will __ A swell B It is impossible to know. C stay the same D shrink

Proteins can be broken down to provide energy to the cell True False