Biology A Exam Review

In DNA, cytosine always pairs with

• guanine

• uracil

• thymine

• adenine

A gene is_______________________.

• located only in sex cells

• a whole chromosome

• a section of DNA that codes for a trait

• not expressed in the dominant form

Tags

NGSS.HS-LS3-1

The diagram shows homologous chromosomes during prophase I of meiosis. Which of the following correctly describes the process being illustrated?

• Segregation of sister chromatids

• Mutation in which the DNA content of the gene is altered

• Crossing over in which alleles are exchanged

• Condensation and segregation of alleles

What happens to the chromosome number during meiosis?

• doubles

• halves

• stays the same

• becomes diploid

Which is the correct phenotype for this organism?

• BB
• blue
• green
• bb

Tags

NGSS.HS-LS3-1

1. ___ combine to form DNA.
2. ___ combine to form proteins.

• 1. amino acids
  2. nucleotides
• 1. sugars
  2. amino acids
• 1. nucleotides
  2. amino acids
• 1. lipids
  2. nucleotides

Tags

NGSS.HS-LS1-1

What amino acid is represented by the codon AUG?

• Aspartic Acid
• Histidine
• Glutamine
• Methionine

Which phrase best describes translation?

• converts mRNA into a polypeptide
• catalyzes bonds between amino acids
• produces RNA from DNA molecules
• recycles tRNA molecules for reuse

Which process is used to make mRNA from the DNA in the nucleus?

• transcription
• translation
• replication 

The central dogma states that information flows from

• RNA to DNA to polysaccharide
• DNA to RNA to proteins
• RNA to DNA to proteins
• DNA to polysaccharides to RNA

Tags

NGSS.HS-LS1-1