A scientist believes that she has found a new life

A scientist believes that she has found a new life form. Which of the following conditions is NOT considered essential in determining whether the putative new life form exhibits/shows the properties of life?

Question 1 options:

It appears to have cells when viewed under a microscope

The creature seems to react to being touched.

The creature possesses purposeful anatomical structures that differ from one another.

The creature's body is bilaterally symmetrical.

Which of the following lists correctly presents levels of organization from simplest to most complex?

Question 2 options:

biosphere, atoms, communities, organisms

molecules, cells, populations, ecosystems

organelles, cells, ecosystems, populations, biosphere

organs, organ systems, organelles, organisms

Which of the following statements must be *FALSE*?

Question 3 options:

Species X and Y belong to different classes, but the same kingdom

Species X and Y belong to the same class, but different kingdoms

Species X and Y belong to the same kingdom, but different families

Species X and Y belong to the same kingdom, but different orders

Species X and Y belong to different orders, but the same domain

What is the difference between prokaryotes and eukaryotes?

Question 4 options:

Prokaryotic cells have a nucleus; eukaryotic cells do not.

Prokaryotes belong to either the plant or the animal kingdom; eukaryotes belong to the bacteria kingdom.

Eukaryotic cells have a nucleus; prokaryotic cells do not.

Eurkarytoes belong to either the plant or the animal kingdom; prokarytoes belong to the fungi kingdom.

An "educated guess" as to what causes an observed phenomenon is known as a ___.

Question 5 options:

theory

hypothesis

control

conclusion

A scientist observes that when she opens the back door of her house to let her cat out, the songs of a certain species of bird abruptly change. She wants to follow up on her observations with an informal experiment. Which of the following is the best hypothesis for explaining the birds' song changes?

Question 6 options:

The bird species switches from song to warning call whenever it sees a potential predator.

The bird species has a variety of songs that it sings, regardless of what is happening in its environment.

Why does the bird song change when I let the cat out?

The birds stop singing because they are afraid of the cat.

A scientist wants to determine whether a new chemical she isolated can cure a certain disease. To test her hypothesis that the new chemical cures the disease more effectively than current treatments, she infects mice with the disease and gives them the new chemical. She then assesses how many mice were cured of the disease. What is missing from her experimental design?

Question 7 options:

She is missing a control group of mice that did not receive the new chemical.

There are no variables in the experiment

She is not missing anything—her experimental design is adequate to test her hypothesis.

She is missing an experimental group of mice that received a half dose of the new chemical.

What is the main purpose of conducting experiments?

Question 8 options:

proving a theory correct

proving a hypothesis correct

making initial observations

disproving a hypothesis

Order the steps of the scientific method from the first step (1) to the last ().

Question 9 options:

12345Analyze Data

12345State Hypothesis

12345Conduct Experiment

12345Report Results

12345Make Observation

Students are designing an experiment to see if changes in pH have an impact on the action of enzymes. Which is the best hypothesis?

Question 10 options:

Will acidic pH reduce enzyme action?

The pH and the temperature of the solution will have an effect on the reaction.

A change in pH will change enzyme activity.

A pH of 10 will result in less enzyme activity compared to pH 7.

You have formulated a hypothesis: "Blueberries contain more vitamin C than raspberries." To test your hypothesis you measure vitamin C levels in 20 blueberries and 20 raspberries from bushes that were grown in the same area under the same environmental conditions (temperature, rain, sunlight). What is the dependent variable in this experiment?

Question 11 options:

The type of soil, temperature, amount of rain and sunlight in the area

Vitamin C levels

Blueberries

Raspberries

What is the atomic number of an element with 8 protons, 9 neutrons and 8 electrons?

Question 12 options:

9

15

8

25

Which type of chemical bond hold water molecules together with other water molecules?

Question 13 options:

polar covalent bonds

ionic bonds

hydrogen bonds

non-polar covalent bonds

Which of the following statements is true?

Question 14 options:

When frozen, ice is less dense than liquid

When frozen, ice is more dense than liquid

Water and ice has the same density

Ice is heavier than water and will sink

What type of chemical bond is responsible for the 3 dimensional structure of nucleic acids and proteins?

Question 15 options:

covalent bonds

ionic bonds

hydrogen bonds

non-polar covalent bonds

____ are atoms that have gained or lost electrons.

Question 16 options:

Elements

Molecules

Ions

Isotopes

Beryllium has an atomic number of 4 and an atomic mass of approximately 9. How many protons does a beryllium atom have?

Question 17 options:

5

4

9

13

SKIP

Which of the following statements about this atom are TRUE? Select all that apply.

Question 18 options:

This atom has a full outer shell

This atom has 8 electrons total

This atom has 6 electrons in the outer shell

This electron has 4 electrons in the inner shell

A substance with a pH less than 7 is ___________, while a substance with a pH greater that 7 is ___________.

Question 19 options:

basic, acidic

neutral, acidic

basic, neutral

acidic, basic

neutral, basic

An atom has 15 protons and 15 neutrons. Which of the following is an isotope to this atom?

Question 20 options:

An atom with 15 protons and 15 electrons

An atom with 17 protons and 15 neutrons

An atom with 15 protons and 17 neutrons

An atom with 17 protons and 17 neutrons