3. Energy & Cell Processes

Bacteria can transcribe and translate human genes to produce functional human proteins because __________.

Which is the three-base coding sequence on tRNA?

Which of the following describes the experimental strategy that was used to decipher the genetic code?a. comparing the amino acid sequences of proteins with the base sequence of their genesb. analyzing the sequence of RNAs produced from known DNA sequencesc. analyzing mutants that changed the coded. examining the polypeptides produced when RNAs with particular sequences were translated

Generally speaking, how many genetic codes are there?

Draw a hypothetical metabolic pathway in Neurospora crassa composed of five substrates, five enzymes, and a product called nirvana. Number the substrates 1–5, and label the enzymes A–E, in order. (For instance, enzyme A catalyzes the reaction between substrates 1 and 2.) (b) Suppose a mutant strain can survive if substrate 5 is added to the growth medium, but it cannot grow if substrates 1, 2, 3, or 4 are added. Which enzyme in the pathway is affected in this mutant?

For each of these statements about the genetic code, select True or False.a. T/F Wobble pairing accounts for the redundancy of the genetic code.b. T/F There are 64 different tRNAs that read the 64 possible codons.c. T/F All possible codons are used, but not all codons specify an amino acid.d. T/F Some codons are recognized by proteins, not by tRNAs.

Draw a hypothetical metabolic pathway in Neurospora crassa composed of five substrates, five enzymes, and a product called nirvana. Number the substrates 1–5, and label the enzymes A–E, in order. (For instance, enzyme A catalyzes the reaction between substrates 1 and 2.) (a) Suppose a mutation made the gene for enzyme C nonfunctional. What molecule would accumulate in the affected cells?

When RNA is being made, the RNA base __________ always pairs with the base __________ in DNA.

One of the possibilities considered about the genetic code was that the code was overlapping, meaning that a single base could be part of up to three codons. How many amino acids would be encoded in the sequence 5′-AUGUUACGGAAU-3′ by a non-overlapping and a maximally overlapping triplet code?a. 4 (non-overlapping) and 16 (overlapping)b. 4 and 12c. 4 and 10d. 12 and 4

Which of the following correctly ranks the structures in order of size, from largest to smallest?a. gene-chromosome-nucleotide-codonb. chromosome-gene-codon-nucleotidec. nucleotide-chromosome-gene-codond. chromosome-nucleotide-gene-codon

Draw a hypothetical metabolic pathway in Neurospora crassa composed of five substrates, five enzymes, and a product called nirvana. Number the substrates 1–5, and label the enzymes A–E, in order. (For instance, enzyme A catalyzes the reaction between substrates 1 and 2.) (b) Suppose a mutant strain can survive if substrate 5 is added to the growth medium, but it cannot grow if substrates 1, 2, 3, or 4 are added. Which enzyme in the pathway is affected in this mutant?

A minimal genetic code requires only 21 codons—one for each amino acid, and one for a stop signal. Given this, what advantage might be offered by having a code with 64 codons?

In many cases, more than one codon codes for the same amino acid. Because of this, we say that the code is __________.