Bio 111 multiple choice questions

Which of the following is the largest in the hierarchy of organisms to ecosystems?

landscapes

Evolution is the genetic change in what over time?

populations

The structural, physiological, or behavioral traits that enhance an organism’s chances of survival and reproduction are known as

adaptations

What is a scientific hypothesis?

A tentative answer to a question from which testable predications can be made

A researcher is studying the effect of exercise on weight. They set up an experiment where half of the mice are housed with a running wheel and the other half are housed without one. After six weeks, the researcher measures the weight of the mice. Which of the following statements best identifies the predicament in this experiment?

Mice with access to a running wheel will weigh less than those without one after six weeks

which of the subatomic particles have a negative charge

electrons

what is the atomic number for nitrogen

7

whatt is the atomic mass for carbon

12

how many total electrons are shared between two atoms that have a single covalent bond

2

in a covalent bond, electrons are ______

shared

is C-H a polar or non-polar covalent bond

non-polar

is C-O a polar or non-polar covalent bond

polar

based on its number of electrons and the octet rule, how many bonds does Oxygen make with other atoms

2

when energy is released by a chemical reaction, what happens to entropy

entropy increases

what kinds of chemical reactions produce more energy than they require

exergonic

which of the following would SLOW the rate of a chemical reaction

increase the activation energy

what type of general reaction breaks polymers into monomers

hydrolysis

which of the following is NOT a property of water

low specific heat

you have a solution with a pH of 4, and want it to have a pH of 8. What do you do?

add a base

how many hydrogen molecules are depicted on the following diagram

6

what is the monomer of lipids

there are none

which of the following is a defining characteristic of lipids

insolubility in water

what is a consequence of a lipid having a higher melting point

it is solid at room temp.

why do unsaturated fatty acids have a lower melting point than saturated fatty acids

double bonded carbons prevent molecules from packing closely

what does “amphipathic” mean

both water “fearing”, and water “loving”

what is the general biological function of steroids in living organisms

to act as a metabolic messenger in circulatory systems

what is the monomer of proteins

amino acids

what kind of bond would link together the monosaccharide within an oligosaccharide

glycosidic bond

what is the monomer of a nucleic acid

nucleotides

which of the following is NOT a main component of a nucleotide

glycerol

which of the following exists solely as a single-stranded molecule

RNA

According to complementary base pairing rules, what base pairs with guanine

cytosine

According to the central dogma, what is the basic unit of hereditary

DNA

in this general diagram of an amino acid, which is the amino group

NH2

which of the following protein structures is the basic sequence of amino acids, linked by covalent peptide bonds

primary

which of the following protein structures is folded into a 3D shape due to different bonds

tertiary

what does denaturing do

disrupts weak bonds within proteins