Advertisement Upgrade to remove ads

In which of the following reactions is the second molecule reduced?

NAD+ -> NADH

Which of the following is true of fermentation?

animals produce lactic acid by fermentation

Which process in eukaryotic cells will proceed normally whether oxygen (O2) is present or not?

glycolysis

What is released as a by-product of cellular respiration during the kreb's cycle?

carbon dioxide

Glycolysis occurs in the ____, the Krebs cycle occurs in the _____, and the electron transport chain occurs in the ____ membrane.

cytoplasm; mitochondria; mitochondrial

Humans require oxygen to....

serve as the final electron acceptor

How many ATP molecules does a eukaryotic cell gain during the aerobic respiration of one glucose molecule?

36

What role do hydrogen ions (H+) play in the electron transport chain?

they are pumped across the mitochondrial inner membrane against their concentration gradient (to where their concentration is high); as the H+ ions flow back to where their concentrations are low, they drive ATP synthase to form ATP

Muscle soreness associated with strenuous exercise is due...

a buildup of lactic acid

During the Krebs cycle, plants and some other organisms "fix" carbon-containing molecules, while other organisms eat those molecules and release CO2. During the carbon cycle, CO2 is produced during ____ and fixed during _____.

aerobic respiration; photosynthesis

Plant leaves appear green because they....

reflect and transmit the green wavelength of the visible light spectrum

What two colors of light drive most of photosynthesis?

red and blue

One of the functions of the stomata is to....

let CO2 into the leaf

Where do the light dependent reactions occur?

thylakoid membrane

Which of the following statements is true?

the shortest wavelength of light is the ultraviolet ray, which is the highest energy

Both photosynthesis and cellular respiration rely on electron carrier molecules to provide electrons to ultimately help produce ATP. In photosynthesis, the source of electrons is ____ and in cellular respiration the source of electrons is ____.

water; glucose

What is the primary function of the light reactions of photosynthesis?

to produce ATP and NADPH

During the calvin cycle, plants...

fix CO2 into sugar

What is photorespiration?

when the enzyme rubisco binds CO2 during the calvin cycle

What principles lie at the core of evolutionary theory?

natural selection and common descent with modifications

Darwin and Wallace both realized that most species produce many more offspring than is necessary to maintain a constant population. What is the fate of the excess individuals?

the more favorable forms survive and reproduce, but the others do not

Pharyngeal slits present in the embryos of organisms as diverse as fish, chickens, and humans. Why would organisms as different as these have similar embyronic structures?

the organisms shared a common ancestor whose embryos had pharyngeal slits

The ultimate source of genetic differences among species is....

mutation

Animals use auricular muscles to swivel their ears to home in on sounds. Humans have auricular muscles but we can't turn our ears. So why do humans have auricular muscles?

they are vestigial structures we inherited from mammalian ancestors

Which of the following statements about the life of Charles Darwin is FALSE?

the captain of the beagle was alfred wallace

How old is the Earth? When did life begin?

4.5 billion years ago; 3.6 billion years ago

What kind of organisms gave rise to whales?

land mammal

In science, a theory is....

an overarching principle supported by many lines of evidence

Which of the following statements would Lamarck agree with?

giraffes got their long necks by stretching and passing this acquired characteristic to their offspring

Which of the following is consistent with a modern understanding of evolution?

there is variation among individuals in a population

Birds with extravagant plumage may be able to pass their genes to the next generation better than drab birds because....

they are more likely to attract a mate

All of the following are forces that can change allele frequency in a population except...

random mating

If within a large population no mutations occur, no migration occurs, all matings are random, and each individual has an equal chance of reproducing, which of the following will probably happen?

no evolution will occur

Organisms that can interbreed with each other in nature but are genetically isolated from all other organisms are a....

species

A small population of deer is introduced to an island. All the males have 11 to 13 points on their antlers. If after several generations most males have antlers with 20 points, this development will have been the result of....

directional selection

A small population of deer is introduced to an island. All the males have 11 to 13 points on their antlers. If after several generations 30 percent of the males have antlers with 9 to 11 points, 40 percent have antlers with 15 to 17 points, and 20 percent have antlers with 12 to 14 points, this development will have been the result of....

disruptive selection

A population becomes isolated from other populations of the same species, and then genetic divergence occurs that prevents them from breeding with other populations. What has happened?

speciation

The great dane and the chihuahua are both domestic dogs, the same species. However, mating between them is limited by....

mechanical incompatability

"Speciation may occur because of accumulation of many minor genetic changes in a population over time." This statement is best associated with...

gradualism

In a population with two alleles, A and a, the frequency of a is 0.6. What is the frequency of heterozygotes if the population is in Hardy-Weinberg equilibrium?

0.48

A bottleneck may be dangerous to a population because...

genetic variability is diminished

Which of these definitions of species most closely fits the biological species concept?

members of the same species can mate and produce fertile offspring

Blue-footed boobies of the galapagos will mate only after a very specific courtship display on the part of the male. He high-steps to advertise his bright blue feet. What isolating mechanism discourages mating outside species?

behavorial isolation

"Speciation may occur rapidly and is caused by a few genetic changes in important genes." This statement is best associated with....

punctuated equilibrium

Which of these is a correct order of taxonomic categories from less specific to more specific?

domain, kingdom, phylum, order, class, family, genus

A common means of speciation in plants but not in animals is...

polyploidy

Which of the following possibilities is the best indicator of an organism's evolutionary fitness?

the number of offspring it produces over its lifetime that survive to breed

An organelle that probably evolved from a prokaryotic organism that moved inside and began to live within a eukaryotic cell is....

a mitochondrion

What is the chromosomal evidence that chimps and humans have a common ancestor?

human chromosome #2 is the result of the fusion of two ancestor primate chromosomse

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again

Example:

Reload the page to try again!

Reload

Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording

Create Set