Which characteristic makes nine amino acids "essential"?

All structural proteins are made from them.

They are not found in nature.

The body cannot make them.

All enzymes are made from them.

In an aquatic ecosystem, the aquatic plants are eaten by small invertebrates that in turn are eaten by crayfish, which are eaten by fish, which are then eaten by ducks. In this system, the greatest amount of biomass would be found in the

The Punnett square below represents a cross that produced two plants with orange flowers. If the orange color of the flowers is a result of incomplete dominance, what color were the flowers on the parent plants?

Scientists are studying two populations of the same species of sea turtle. one population is quite small with only 18 individuals, and the other is much larger, with 147 individuals.

A. what component must be compatible with every other component of the computer

Which of the following is a possible future milestone in environmental policy? a. water pollution policy b. implementation of a cap and dividend policy c. mandatory environmental assessments d. environmental impact statements

Which statements describe dark matter? Check all that apply.

Tecido e orgao e sistema é integrado. Por que?

What type of physical response would an animal display if it were caught in a sudden sand storm? blinking shedding scratching panting

Huntington's disease is a hereditary ailment caused by a recessive gene. if both parents carry the gene but do not have the disease, there is a 0.25 probability that an offspring will fall victim to the condition.

What enzyme found in saliva breaks chemical bonds between the sugar monomers in starches