Question

Which type of microscope requires a nonmetal sample to be prepared for viewing by coating it with a thin layer of a conductive material?

Compound light microscope
Scanning electron microscope
Transmission electron microscope
Dissecting microscope

Answer 1

@JustSaiyan

Answer 2

transmission electron microscope

Answer 3

Jamie is reviewing a new diet plan that involves purchasing pre-packaged meals and taking a patented energy supplement. In an ad explaining how it works, Jamie reads about a study cited as evidence supporting the effectiveness of the plan. In the study, two groups were followed: one following the plan and another following a simple low-carbohydrate diet. What should Jamie look for in the study to have full confidence in its scientific reliability?

A list of differences between the two diets in the study
A comparison of the plan to a variety of diets
Details on the number of studies conducted and the results of each trial
Testimony from a wide range of users

Answer 4

Sorry went to get something to eat XD

Answer 5

@JustSaiyan

Answer 6

Sorry, Iwas in Biology class.

Answer 7

I would say "Details on the number of studies conducted and the results of each trial"

Answer 8

Its cool dude dont worry XD

Answer 9

A sports drink company develops a new product that is advertised to decrease soreness after rigorous exercise. Which of the following evidence of this claim would the scientific community accept as the most reliable?

A written description of the experiments used to support the claim
High-profile athletes supporting the claim in sports journals and magazines
Other scientists not associated with the product testing the claims
Disclosure of the ingredients of the product and their known side effects

Answer 10

Other scientists not associated with the product testing the claims

Answer 11

Which answer correctly summarizes the essential elements of a scientific theory?

Eventually become laws; based on many tests and reviews; usually do not change
Predict and describe; based on observation and logic; formulated before experimentation
Never become laws; based on strong scientific support; may change based on evidence
Describe the natural world; based on many observations and data; do not explain why

Answer 12

Never become laws; based on strong scientific support; may change based on evidence

Answer 13

Which of the following discoveries is most crucial to explaining why all organisms share the same genetic code?

Vesicles containing the same organelles
Microspheres' similarities to modern meteorites
RNA's ability to self-catalyze
DNA's ability to absorb carbon molecules

Answer 14

RNA's ability to self-catalyze

Answer 15

Which of the following best describes one way electron microscopes and light microscopes differ in structure?

Light microscopes use vacuum tubes instead of electron beams to concentrate light on the stage.
Electron microscopes use an infrared light source instead of a regular light source to display images.
Electron microscopes use a beam of electrons instead of light to magnify images.
Light microscopes use lamps instead of electric cables as a power source.

Answer 16

Electron microscopes use a beam of electrons instead of light to magnify images

Answer 17

Fruit flies are commonly used in genetic investigations that focus on traits passed from parents to offspring over several generations. What can you infer is the reason fruit flies are the most commonly used organism for this type of investigation?

Many more generations can be studied using short-lived organisms.
Scientists prefer to study what has previously been studied.
Society does not have ethical issues with lab-kept fruit flies.

Fruit flies are relatively inexpensive.

Answer 18

Many more generations can be studied using short-lived organisms

Answer 19

n 1907, Dr. Duncan MacDougall performed a series of experiments in which he attempted to measure the weight of the soul as it left a dying person. In his experiments, MacDougall placed a dying person on a scale and measured their weight immediately prior to and following death. MacDougall determined the change in weight to be approximately 21 grams. From these experiments, he concluded that the soul exists and has mass. What is the fundamental scientific flaw in his conclusions?

They are based on the concept of the soul, which is beyond the bounds of science.
They are based on the idea that the soul is made of matter, not energy.
They are based on the assumption that the soul does not remain in the body after death.
They are based on the concept that the soul can be measured.

Answer 20

They are based on the concept of the soul, which is beyond the bounds of science

Answer 21

Which of the following best describes what causes water molecules to exhibit properties such as cohesive and adhesive behavior?

Water molecules are polar, having partially positive and partially negative ends.
Water molecules have both a hydrophobic end and a hydrophilic end.
Water molecules are capable of dissolving both polar and nonpolar substances.
Water molecules have a high molecular weight, making them very dense.

Answer 22

@JustSaiyan

Answer 23

The cohesive and adhesive behavior of water molecules are caused by water molecules being polar, having partially positive and partially negative ends

Answer 24

Water molecules are polar, having partially positive and partially negative ends.