There are several key differences between DNA and RNA, the two main types of nucleic acid. Identify the statement below that correctly describes a difference between RNA and DNA.(1 point)

Question

Responses

DNA is a single-stranded molecule whereas RNA is a double-stranded molecule in cells.
DNA is a single-stranded molecule whereas RNA is a double-stranded molecule in cells.

DNA uses ribose while RNA uses deoxyribose as the sugar in the molecule’s backbone.
DNA uses ribose while RNA uses deoxyribose as the sugar in the molecule’s backbone.

Adenine binds with the nitrogen base thymine in DNA while it binds with uracil in RNA.
Adenine binds with the nitrogen base thymine in DNA while it binds with uracil in RNA.

DNA uses phosphate groups to link nucleotides together whereas RNA uses ketone groups.

Proteins are built by bonding amino acids together using a peptide bond. Identify the two chemical groups that are bonded together in a peptide bond.(1 point)
Responses

carboxyl and amino groups
carboxyl and amino groups

amino and methyl groups
amino and methyl groups

carboxyl and methyl groups
carboxyl and methyl groups

methyl and sulfhydryl groups

Summarize cellular respiration. Why is it an exothermic reaction?(1 point)
Responses

because it produces glucose
because it produces glucose

because it produces carbon dioxide
because it produces carbon dioxide

because it produces energy
because it produces energy

because it produces water

You are writing a research paper on the effect of caffeine on sleep. You would like to use reliable sources when preparing your research. You decide to use a well-known, peer-reviewed scientific journal called Nature.

Identify the answer choice below that best explains why this scientific journal would be considered a reliable source.

(1 point)
Responses

It is a scientific journal, and all scientific journals are considered to be reliable sources when the research concerns science.
It is a scientific journal, and all scientific journals are considered to be reliable sources when the research concerns science.

The journal has been widely cited in student blogs that focus on explaining scientific topics to other students.
The journal has been widely cited in student blogs that focus on explaining scientific topics to other students.

The information in this journal is consistently valid because the peer review helps to ensure the results are accurate.
The information in this journal is consistently valid because the peer review helps to ensure the results are accurate.

The journal was included on the approved list of sources from the teacher that could be used on the assignment.

Answer 1

Here are the correct responses for each of your questions:

1. Key differences between DNA and RNA:

   • Response: Adenine binds with the nitrogen base thymine in DNA while it binds with uracil in RNA.

2. Chemical groups linked in a peptide bond:

   • Response: carboxyl and amino groups

3. Summary of cellular respiration and why it is an exothermic reaction:

   • Response: because it produces energy

4. Reason why the journal Nature is considered a reliable source:

   • Response: The information in this journal is consistently valid because the peer review helps to ensure the results are accurate.

If you have any more questions or need further clarification, feel free to ask!