Le August 2009 Multiple Choice

Based on the diagram and knowledge of biology, substances X and Y in the chemical reaction are examples of simple sugars. This can be inferred because simple sugars are commonly involved in metabolic reactions in the human body, and the diagram represents a chemical reaction occurring in the body. The presence of substances X and Y suggests that they are simple sugars, which are important sources of energy for cellular processes.

Weakened viruses (or pathogens) are found in vaccines.

The structure of a cell determines how it functions.

KEY WORD: IDENTICAL.
identical means asexual.

Feedback is when you respond to information based on what happens in an ecosystem.

creating the perfect cow, horse, dog, fruit, or vegetable requires the act of selective breeding, which is choosing certain traits that you want to see in the offspring.

Homeostasis is a balance in organisms. This balance is maintained in the body through the actions of many organ systems (or organelles in single-celled organisms).

The gene is the smallest component. The cell is the largest component. The rest fall into place.

organelles are the only substance in the list that are found INSIDE cells.

If there's no sunlight, there will be no energy flowing into an ecosystem.

If the gene is changed, the trait may change as a result.

Autotrophs make their own food from CO2 and H2O, both ABIOTIC substances.

This population grew rapidly then leveled out. The carrying capacity graph typically looks like a squiggly line at the top, which levels out.

Don't be fooled by this one. The fungus in this case is a parasite. The human is not an autotroph.

Mitochondria use glucose to produce ATP through the process of respiration.

The skin is from the SAME individual so the DNA (and proteins like those that make up the antigens) would be identical. Therefore, no rejection.

Recombining of genes allows new combinations to occur in the offspring. Traits that didn't appear in the parents may show up in the offspring.

Simple as looking at a graph...day 2, hormone B has the lowest concentration.

The orchid and the bee require each other for reproduction. Without the bee, the orchid will go extinct.

Three of these are bad. One of these is good. Go with the good one in this case.

Last year, there were 35 and this year, there were 156. 'NUFF SAID.

Rulers are for measuring distance, not volume or temperature!!

more genetic variation means that there is more chances of survival in the case of a natural disaster.

The mother and the child each have their own blood systems, but the materials may be exchanged through the placenta.

Increased industrialization is the cause of the other three. None of the others would be happening if it weren't for the industrialization.

Leaf B was performing photosynthesis and should have more starch than Leaf B.

The differences in bones enable the species to survive in different environments.

The hypothesis tells us what data to collect. In other words, IF we exercise, THEN we will squeeze more clothespins.

When energy is lost between different organisms in a feeding relationship, the energy is lost as heat.

When two organisms compete for the same resources, it is very likely that one organism will survive (better adapted for the ecosystem) and one organism will die out (poorly adapted).

There is only one difference between the unknown species and species IV.

Radiation causes mutations. Simple as that.

Habitats need diversity to survive. Without the diversity of flowering trees and shrubs, the ecosystem may be destroyed by human interaction.

Nutrients aren't recycled when they harvest the crops (like wheat, corn, and barley), so the soil becomes quickly depleted of the nutrients.

The environment (nutrition) is affecting this boy's growth.

Bacteria is able to produce hormones for humans, most notably INSULIN.

Just because something is at the end of the tips doesn't mean it's still alive...the organisms are still alive if they make it to "PRESENT" time. On the same branch, they are closely related.

The sequence of amino acids produces hemoglobin in an abnormal shape. The amino acids themselves are not abnormal. The hemoglobin is abnormal.

A trade-off is when you consider the good with the bad and decide how you want to proceed based on the potential outcome.

Millions of sperm need to be produced so that some will reach the egg. The female's body is not a good environment for sperm. Many die before they even reach the fallopian tubes.

Those bacteria that were killed were not resistant. They were not adapted properly. They did not pass on their resistant traits.

Molecule Z (an enzyme) works best at a specific pH. Too high or too low will destroy the enzyme.

with an abundant food supply, there will be a sharp increase in population.