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6. using the original dna strand below, build a new strand using the co…

Question

  1. using the original dna strand below, build a new strand using the complementary base pairing rules for dna replication.

a. original dna strand: aac cta gcg tcg
b. complementary strand: _______________

  1. what is the first step of protein synthesis and where does it occur?

a. first step:__________
b. where it occurs:__________

  1. how does the process of transcription result in the expression of genes?

a. atp transcribed from dna genes is used by ribosomes to assemble amino acids into proteins.
b. the ribosomes transcribe the genetic information from dna genes to use when they assemble amino acids into proteins.
c. mrna is transcribed into dna, which stores the genetic information used by the nucleus to assemble amino acids into proteins.
d. dna genes are transcribed into mrna. the genetic information in the mrna is used by ribosomes to assemble amino acids into proteins.

  1. using the base pairing rules for transcription, make the complementary mrna strand based on the original dna strand:

a. dna strand: gtt acg cag tat
b. mrna strand: _______________

  1. using the base pairing rules for transcription, make the complementary mrna strand using the original dna strand:

a. dna strand: gca tct agc ccg
b. mrna strand: _______________

  1. the image shows two processes that occur in cells. which of the following correctly identifies the process in the image?

a. b is translation because proteins are being formed from amino acid codons.
b. b is transcription because proteins are synthesized from dna to express genes.
c. a is transcription because a double - stranded mrna is made from the dna template.
d. a is translation because dna is being replicated into a new single - stranded dna

Explanation:

Question 6

Step1: Recall DNA base pairing rules

In DNA replication, adenine (A) pairs with thymine (T), and cytosine (C) pairs with guanine (G).

Step2: Pair each base in the original strand

Original DNA strand: AAC CTA GCG TCG

  • AAC: A pairs with T, A pairs with T, C pairs with G → TTG
  • CTA: C pairs with G, T pairs with A, A pairs with T → GAT
  • GCG: G pairs with C, C pairs with G, G pairs with C → CGC
  • TCG: T pairs with A, C pairs with G, G pairs with C → AGC

Combine these: TTG GAT CGC AGC

Brief Explanations

The first step of protein synthesis is transcription, where DNA's genetic information is copied into mRNA. Transcription occurs in the nucleus of eukaryotic cells (or in the cytoplasm of prokaryotes, but typically taught as nucleus for basic biology).

Brief Explanations
  • Option a: ATP is not transcribed from DNA; ATP is an energy molecule. Eliminate.
  • Option b: Ribosomes do not transcribe DNA; transcription is done by RNA polymerase. Eliminate.
  • Option c: mRNA is transcribed from DNA, not the other way. Eliminate.
  • Option d: Transcription makes mRNA from DNA, and mRNA is used by ribosomes for translation (assembling amino acids into proteins). This matches the process.

Answer:

TTG GAT CGC AGC

Question 7