Which of the followingstatements about polypeptides is not correct?
Answer
their structure is influenced by hydrophobic effects
they are synthesized inside the endoplasmic reticulum
they can recognize specific DNA sequences
their function can be modified by phosphorylation
they can fold to form helices, sheets, coils
Which of the followingis not true of ribosomes?
Answer
they have codons in ribosomal RNA
ribosomes catalyze peptide bond formation
ribosome structure requires rRNA binding to proteins
they can bind to transfer RNA
they can bind to the 5' end of messenger RNA
The cell membrane formsas a result of
Answer
cholesterol binding
covalent bonds between head groups
hydrogen bonding between fatty acid chains
hydrophobic effects on phospholipids
assembly directed by membrane proteins
Which statement aboutcarbohydrates is incorrect?
Answer
can be attached to proteins
can mediate selective transport into the cell
can be used to store energy
can be attached to lipids
can provide structure for cells
Which of the followingstatements about electron transport used for respiration in animal cellsis incorrect?
Answer
produces CO2
involves proton transport
consumes oxygen
all answers are correct
initiated by oxidation of NADH
Which of the followingis not true of DNA?
Answer
it is usually found as two anti-parallel strands
it is located in the nucleus
it is a template for synthesis of messenger RNA
it is a template for the synthesis of DNA
its nucleotide base-pairing is mediated by phosphodiester bonds
ATP
Answer
is an essential enzyme
acts as an electron carrier
base-pairs with thymidine nucleotides
contains high energy bonds
all answers are correct
A mutation in thenon-coding region of a gene
Answer
can change the expression of the gene product
can change the structure of the gene product
can't have a phenotype
can't be inherited
A gene
Answer
is a trait
is expressed only in the presence of RNA polymerases
is assembled from a set of essential amino acids
is replicated during the G1 phase of the cell cycle
changes its information depending on the environment of the cell
Alleles of a gene
Answer
have the same DNA sequence
can produce different versions of a protein
mark the start and stop of transcription
are always in the same DNA molecule
