Bio B Practice T1 23-24

What is the correct order for the scientific method?

• Option 1

• Option 2

• Option 3

• Option 4

Answer explanation

The correct order for the scientific method is Option 3. It involves making observations, forming a hypothesis, conducting experiments, analyzing data, and drawing conclusions.

Why do scientists use the scientific method?

• It doesn't really work, they just do it out of habit.

• Because it is often the easiest way to do an experiment.

• To earn more money.

• To learn the truth about something in nature.

Answer explanation

Scientists use the scientific method to learn the truth about something in nature.

What is the difference between a hypothesis and a theory?

• A hypothesis is a well-supported explanation, and a theory is a guess we can test.

• A hypothesis is a prediction that needs checking, and a theory is a fact that's not yet proven.

• A hypothesis is a guess we can test, and a theory is a well-supported explanation for observations.

• A hypothesis is an idea we've proven correct, and a theory is a question we're still investigating.

Answer explanation

A hypothesis is a testable guess, while a theory is a well-supported explanation for observations.

They discovered the structure of the DNA molecule.

• Watson and Crick

• Abbot and Costello

• Martin and Lewis

• Astaire and Rogers

Answer explanation

Watson and Crick discovered the structure of the DNA molecule.

Her famous Photo-51 helped scientist realize DNA was a helix (spiral).

• Mary Leaky

• Henrietta Lacks

• Rosalind Franklin

• Marie Currie

Answer explanation

Rosalind Franklin's famous Photo-51 confirmed DNA's helical structure, revolutionizing our understanding of genetics.

A twisted ladder type spiral shape.

• Conchospiral

• Helix

• Double Helix

• Triple Helix

Answer explanation

The correct choice is Double Helix. It refers to a twisted ladder type spiral shape.

DNA uses 4 of these, abbreviated A, T, G, C.

• Nitrogen Base

• Carbon Compounds

• Phosphates

• Ribose Sugars

Answer explanation

DNA uses four nitrogen bases: adenine (A), thymine (T), guanine (G), and cytosine (C). These bases form the genetic code and determine the characteristics of living organisms.

Forms part of the DNA spiral backbone.

• Nitrogen Base

• Phosphates

• Carbon Compounds

• Mitochondria

Answer explanation

Phosphates form the DNA spiral backbone. They provide stability and structure to the DNA molecule.

Sugar that forms the second part of the DNA backbone.

• Lipid

• Nitrogen Base

• Glucose

• Ribose

Answer explanation

Ribose is the sugar that forms the second part of the DNA backbone. It is a five-carbon sugar.

What is the main function of the nervous system?

• To support the body

• To digest food

• To control and communicate information throughout the body

• To pump blood

Answer explanation

The main function of the nervous system is to control and communicate information throughout the body.