Q: The Central Dogma of Molecular Biology is best represented by which sequence?

$$\text{DNA} \rightarrow \text{RNA} \rightarrow \text{Protein}$$

Question 1

Which of the following best describes the difference between a genotype and a phenotype?

Accepted Answer

Genotype refers to the genetic makeup of an organism, while phenotype refers to the observable traits resulting from that genetic makeup.

Question 2

Which of the following statements about prokaryotes and eukaryotes is correct?

Accepted Answer

Eukaryotes have membrane-bound organelles, while prokaryotes do not.

Question 3

Chargaff's rules contributed to the discovery of DNA structure by showing:

Accepted Answer

The amount of adenine equals thymine, and the amount of cytosine equals guanine in DNA.

Question 4

Which of the following best explains why the structure of DNA suggests a mechanism for its replication?

Accepted Answer

The double helix structure allows each strand to serve as a template for the synthesis of a new complementary strand.

Question 5

A codon in mRNA is $$	ext{AUG}. $$Using the genetic code, which amino acid does this codon specify?

Accepted Answer

Methionine

Question 6

Which of the following best describes the concept of redundancy in the genetic code?

Accepted Answer

Multiple codons can specify the same amino acid.

Question 7

Which RNA molecule is responsible for carrying amino acids to the ribosome during translation?

Accepted Answer

tRNA

Question 8

The Central Dogma of Molecular Biology is best represented by which sequence?

Accepted Answer

$$	ext{DNA} ightarrow 	ext{RNA} ightarrow 	ext{Protein}$$

Question 9

Which of the following best describes the amphipathic nature of nucleotides and its significance in DNA structure?

Accepted Answer

Nucleotides have both hydrophobic and hydrophilic regions, allowing the double helix to form with bases inside and the sugar-phosphate backbone outside.

Question 10

A phylogenetic tree shows that species A and B share a more recent common ancestor than either does with species C. What does this imply about their genetic relationship?

Accepted Answer

Species A and B are more genetically similar to each other than to species C.

Question 11

Which of the following is NOT a role of rRNA in gene expression?

Accepted Answer

rRNA carries genetic information from DNA to the ribosome.

Question 12

If a DNA sequence is $$	ext{ATGCGT}$$, what would be the complementary DNA strand?

Accepted Answer

$$	ext{TACGCA}$$

Question 13

Which of the following best describes an allele?

Accepted Answer

A variant form of a gene at a particular locus.

Question 14

A mutation changes the codon $$	ext{GAA} to$$ $$	ext{GAG} in $$mRNA. Both codons code for glutamic acid. What is this an example of?

Accepted Answer

A silent mutation

Question 15

Which of the following is a correct statement about the genome?

Accepted Answer

The genome is the complete set of DNA, including all genes, in an organism.

Question 16

In a real-world scenario, a patient is diagnosed with sickle cell anemia, which is caused by a single nucleotide change in the gene encoding beta-globin. This change results in a different amino acid being incorporated into the protein. Which type of mutation is this?

Accepted Answer

Missense mutation

Question 17

Which of the following best explains why Franklin's X-ray crystallographic data was crucial to Watson and Crick's model of DNA?

Accepted Answer

It revealed the double helix structure and the regular spacing between the bases.

Question 18

A scientist is comparing the genomes of two bacterial species. She finds that one species has a single circular chromosome, while the other has multiple linear chromosomes. Which statement is most accurate?

Accepted Answer

The species with multiple linear chromosomes is likely a eukaryote.

Question 19

During translation, which molecule provides the template for protein synthesis?

Accepted Answer

mRNA

Chapter 1 Study Guide: The Molecular Basis of Heredity, Variation, and Evolution

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