Biology Test 1

What is the Mass Number of a (hypothetical) element with 24 neutrons, 27 electrons and a charge of -2?

49

A population of ground squirrels has an annual per capita birth rate of 0.02 and an annual per capita death rate of 0.08. Calculate an estimate of the number of individuals added to (or lost from) a population of 1,000 individuals in one year.

60 individuals lost

Which of the following is the best description of an emergent property?

A property that emerges when structures become more complex

An element has an Atomic Number of 13. This element is ___________________.

Aluminium

A given solution has a pH of 10. Which of the following best describes that solution?

Basic; H+ acceptor

Which drawing in the figure above depicts the electron configuration of an element which is capable of forming two double covalent bonds?

C

Which drawing in the figure on the previous page depicts the electron configuration of an atom that is chemically inert (not chemically reactive)?

E

Why does ice float in liquid water?

Ice is less dense than liquid water.

Which of the following is correct?

K+ has 18 electrons

You have been trying to get rid of crabgrass in your lawn for a couple years without much success. You see a new product called "NO CRAB" at your local hardware store that claims to"kill crabgrass dead." It is pretty expensive ($60/gallon); however, it does have a money back guarantee (if you can demonstrate that it DID NOT work). You decide to try it out and carefullydesign a "proper" experiment. You select two large patches of crabgrass in your lawn (taking pictures of both, for proper documentation). On one patch you apply the (liquid) NO CRAB as directed. On the other patch you just apply water (no crabgrass killer). You monitor both patches, taking pictures once/day for 2 weeks. Which of the following would be a good experimental hypothesis for this experiment?

No crab will kill crabgrass

Which of the statements below accurately describe ionic bonds?

One atom, the anion, "steals" one (or more) electrons from the cation.

Which of the following is the BEST explanation for why hydrogen bonds form between water molecules?

Oxygen is very electronegative, making all of the bonds within a water molecule polar covalent bonds.

Which of the following is TRUE of hydrogen bonds?

They occur between water molecules.

Which of the following is correct regarding the substance (below)? O= C=O

This substance is both a molecule and a compound.

In regard to water, which of the following is the best example of adhesion?

Water molecules cling to the cell walls of plant cells.

The four elements that make up 96% of living matter are

carbon, hydrogen, oxygen, and nitrogen.

Globally, if a population lives only along a lake's shoreline, members of the populationexhibit what type of distribution?

clumped

Which of the following causes populations to shift most quickly from an exponential to a logistic population growth?

competition for rescources

The human population on the plant

exhibited exponential growth for many years.

A "J-shaped" growth curve indicates

exponential growth

A buffer ___________________________.

functions to keep the pH stable (keep it from changing)

Which of the following is a group within Domain Eukarya?

fungi

Which of following correctly completes the statement? If the number of _______________changed, then the atom would be a_______________.

neutrons, different isotope

You put some NaOH, a strong base, in a flask filled with pure water. Which of the following is most likely to be the pH of this liquid?

pH 8.0

The trees in your backyard would belong to kingdom

plantae

A group of individuals of the same species that live in the same local area and can interbreed to produce fertile offspring is a

population

Based on your knowledge of the polarity of water molecules, the solute molecule depicted above is most likely _

positively charged

As N approaches K for a certain population, which of the following is predicted by the logistic equation?

the growth rate will approach zero

carrying capacity

the maximum population size that a particular environment can support.

In the previous experiment (#7), what was the Experimental Group?

the patch of crabgrass that got NO crab

In the previous experiment (#7), what was the Independent Variable?

what type of liquid was applied to the crabgrass patches (NO CRAB vs. water)