The Daily Item, Sunbury, PA

News

December 1, 2012

Keystone biology: Are you smarter than an 11th-grader?

Pass the test and graduate from high school!

(Continued)

ANSWER KEY AND EXPLANATIONS:

1. Which statement best describes a difference between prokaryotic cells and eukaryotic cells?

A. The presence of both DNA and ribosomes in prokaryotic cells indicates that they are more complex than eukaryotic cells.

B. The larger size of prokaryotic cells indicates that they are more complex than eukaryotic cells.

C. The presence of membrane-bound organelles in eukaryotic cells indicates that they are more complex than prokaryotic cells.

D. The larger size of eukaryotic cells indicates that they are more complex than prokaryotic cells.

A. Both cell types contain DNA and ribosomes; prokaryotes have less-complex cell organization.

B. Prokaryotes have less-complex cell organization and are generally smaller than eukaryotes.

C. ANSWER: Eukaryotes are more complex because they have organelles that are membrane bound, such as the nuclei which contain their DNA. Prokaryotes have DNA, but it is not bound by a membrane as in eukaryotes.

D. A high surface-area-to-volume ratio usually increases cell efficiency; therefore, larger cells are usually cells are usually less efficient than smaller cells.

2. Alveoli are microscopic air sacs in the lungs of mammals. Which statement best describes how the structure of the alveoli allows the lungs to function properly?

A. They increase the amount of energy transferred from the lungs to the blood.

B. They increase the flexibility of the lungs as they expand during inhalation.

C. They increase the volume of the lungs, allowing more oxygen to be inhaled.

D. They increase the surface area of the lungs, allowing efficient gas exchange.

A. The structure of the alveoli has little impact on the lung’s ability to transfer energy.

B. The structure and function of the alveoli has little impact on the flexibility of lung tissue.

C. The millions of alveoli in the lungs of mammals decrease the total volume of the lungs.

D. ANSWER: The millions of alveoli in mammals greatly increase the surface area of the lungs, thereby providing a larger surface area for gas exchange.

Text Only
News
  • 1WEATHER.jpg Deadly storm his Virginia campground

    A fierce storm packing powerful winds and rain toppled trees and flipped campers Thursday at a Virginia campground this morning, killing at least two people and sending at least 20 more to hospitals, officials said.

    July 24, 2014 1 Photo

  • eyebrows.jpg Coming Sunday: Browsing for brows

    As makeup sales soar, four tips to make your eyebrows raise others'. Coming Sunday

    July 24, 2014 1 Photo

  • Official: Air Algerie flight ’probably crashed’

    An Air Algerie flight carrying 116 people from Burkina Faso to Algeria’s capital disappeared from radar early Thursday over northern Mali and “probably crashed,” according to the plane’s owner and government officials in France and Burkina Faso.

    July 24, 2014

  • 1gaza25.jpg Israeli fire hits UN facility in Gaza, killing 15

    Israeli tank shells hit a compound housing a U.N. school in the northern Gaza Strip on Thursday, killing at least 15 people and wounding dozens who were seeking shelter from fierce clashes on the streets outside.

    July 24, 2014 1 Photo

  • 1execution.jpg How Arizona, Ohio, Oklahoma, executions went awry

    Since the start of the year, executions in Ohio, Oklahoma and Arizona have gone awry, with inmates gasping for breath as lethal drugs coursed through their bodies.

    July 24, 2014 1 Photo

  • Today's Editorial: One more job appears at risk

    July 24, 2014

  • Rabbi Conflict in Israel grounds Sunbury rabbi

    TEL AVIV, Israel — While the Israelis and Hamas traded rocket and missile strikes for a 16th day, Rabbi Nina Mandel is struggling to find her way back to Sunbury after the FAA on Wednesday announced that it would extend its ban on travel at Ben-Gurion International Airport for another 24 hours.

    July 24, 2014 1 Photo

  • Fatal24 Danville woman dies as logging truck crushes car in Valley Township

    DANVILLE — An 84-year-old Danville woman was killed when her car and a logging truck collided Wednesday afternoon at Routes 642 and 54 in Valley Township.

    July 24, 2014 1 Photo

  • Docs: Fractures helped save rock victim's life

    DANVILLE — Sharon Budd’s condition is progressing nearly a week after a 13 1/2-hour procedure in which a team of surgeons rebuilt her facial bones and removed a damaged part of her brain, said two Geisinger Health System physicians who are part of that team

    July 24, 2014

  • Magistrate judge sides with Warrior Run

    WILLIAMSPORT — A federal magistrate judge says he agrees with a hearing officer that a Warrior Run student does not need special-education services,

    July 23, 2014

The Daily Marquee
Video
Parade
Magazine

Click HERE to read all your Parade favorites including Hollywood Wire, Celebrity interviews and photo galleries, Food recipes and cooking tips, Games and lots more.