Answer

1. what is one similarity between natural selection and artificial selection?

a.
humans do the "selecting."
b.
the traits of organisms change over time.
c.
genes do not determine the traits being selected.
d.
the process of selection has been going on for billions of years.

2.why might these male guppies have bright coloration?

a.
female guppies prefer dully colored males.
b.
female guppies prefer brightly colored males.
c.
predators tend to eat more dully colored guppies.
d.
predators tend to eat more brightly colored guppies.

3. what is likely to happen when humans spray pesticides that are not strong enough to kill all the insects they are trying to get rid of?

a.
all of the insects will pass on their genes
b.
none of the insects will pass on their genes
c.
the weakest insects will pass on their genes
d.
the strongest insects will pass on their genes

4. if there were many predators in a particular stream, which guppies would tend to be selected and pass on their genes?

a.
plain guppies
b.
large guppies
c.
small guppies
d.
colorful guppies

5. what effect will taking a dose of antibiotics that is too small have on the bacteria you are trying to destroy?

a.
all of the bacteria will pass on their genes
b.
none of the bacteria will pass on their genes
c.
the weakest bacteria will pass on their genes
d.
the strongest bacteria will pass on their genes

Nanotechnology, the field of trying to build ultrasmall structures one atom at a time, has progressed in recent years. one potential application of nanotechnology is the construction of artificial cells. the simplest cells would probably mimic red blood cells, the body's oxygen transporters. for example, nanocontainers, perhaps constructed of carbon, could be pumped full of oxygen and injected into a person's bloodstream. if the person needed additional oxygen-due to a heart attack perhaps, or for the purpose of space travel-these containers could slowly release oxygen into the blood, allowing tissues that would otherwise die to remain alive. suppose that the nanocontainers were cubic and had an edge length of 24 nanometers. part a part complete what is the volume of one nanocontainer? (ignore the thickness of the nanocontainer's wall.) express your answer using two significant figures. v v = 1.4ă—10â’20 l previous answers correct significant figures feedback: your answer 1.3824â‹…10â’20 = 1.382ă—10â’20 l was either rounded differently or used a different number of significant figures than required for this part. if you need this result for any later calculation in this item, keep all the digits and round as the final step before submitting your answer. part b suppose that each nanocontainer could contain pure oxygen pressurized to a density of 81 g/l . how many grams of oxygen could be contained by each nanocontainer?

What will most likely happen in the absence of a cell membrane? a) photosynthesis will not take place. b) the cell will not store food, water, nutrients, and waste. c) energy will not be released during cellular respiration. d) substances will pass in and out of the cell in an uncontrolled manner.

Which is the solubility product expression for caf2(s)?  [ca2+]/[f–]2  [ca2+][f2–]  [ca]+[f]2  [ca2+][f–]2