Quiz 1 Questions: Exam 1

The latin phrase omnis cellula e cellula refers to a cellular principle. Which of the following statements is the best translation of this phrase?

All cells arise only from preexisting cells.

Which of the following is true of nanometer?

A nanometer is equivalent to 1000 picometers

which of the following is not a tenet of the cell theory?

All cells have a membrane-bound nucleus

Of the following specialized procedures, which may be used with the electron microscope?

All of the above: negative staining, scanning electron microscopy, freeze fracturing, and shadowing with gold.

The scientific work that established DNA, rather than protien, as the molecule of heredity is credited to

Avery, MacLeod, and McCarty

The limit of resolution can best be defined as?

the distance that two objects must be apart to be distinguished as separate object.

Which of the following is false of brightfield microscopy?

Specimens are always viewed without being stained.

1mm=_____ nm

1,000,000

Which type of microscopy has the greatest resolving power?

Electron

Which of the following is mismatched?

Chlamydomonas-cell differentiation

Scanning electron microscopy (SEM) is especially suited to

Create a sense of depth

Which of the following is true of fluorescence microscopy?

Fluorescent light is emitted throughout the specimen being viewed.

All of the following are model organisms, except

Homo sapiens

In studying osteoporosis in humans, you wish to test a newly designed treatement for efficacy. Your best choice for a model organism would be

Mus Musculus

Which organelle is round and derives its name from the Latin word for Kernel?

Nucleus

A microtome is used to

Slice thin sections of specimens

Which scientist is credited with coining the term cell from the Latin celluae?

Robert Hooke

In 1665 ____ used a microscope that he had built to examine thin slices of ____. While examining this material, he observed tiny compartments that he called cellulae.

Robert Hooke; cork

Which of the following is closest to a micrometer in size?

a typical bacterial cell

A scientist is examining motile protozoa. He wishes to determine their direction of movement. Which of the following microscopic techniques is least likely to be used to view these cells?

electron microscopy

Gregor Mendel was most influential in which field of biology?

genetics

Which laws were formulated by Mendel?

heredity

When scientists use the scientific method, they use terms to indicate their degree of certainty. Which of the following terms conveys the least degree of certainty?

hypothesis

All of the following biochemical techniques have allowed us to understand cell structure and function except

light microscopy

The step of the scientific method, in the correct order, are:

make observation, formulate the hypothesis,design experiments, collect data, interpret results, and draw conclusions.

Jacques Monod and Francois Jacob deduced the mechanism responsible for the regulation of bacterial gene expression. They are, therefore, responsible for launching the era of

molecular genetics

Early microscoped did not allow clear visualization of cells because they were limited by

resolution

Which of the following is smallest?

protein

You are studying the response of macrophages infected with the intracelluar bacterium Brucella, specifically by examining which gene products are being expressed. You would be studying the macrophage ______ to obtain this information.

transciptome

Which of the following can only be viewed by electron microscopy?

viruses

Which of the following scientists revolutionized biology by demonstating that living organisms were also goverened by the laws of physics and chemistry by synthesizing urea in the laboratory from ammonium cyanate?

Wohler

cell biology emerged which of the following fields of biology?

all of the above: biochemistry, cytology, and genetics

Which type of microscopy enhances and amplifies slight changes in the phase of transmitted light?

both phase contrast and differential interference contrast microscopy

You wish to obtain a pure mitochondria sample from lysed cells. The best way to obtain this sample would be

centrifugation

You are working on a project that involves the direct three-dimensional observation of DNA molecules. The microscope that would give you the best information at this time would be the

scanning tunneling microscope