In birds, sex is determined by a ZW chromosome scheme. Males are ZZ and females are ZW. A recessive lethal allele that causes death of the embryo is sometimes present on the Z chromosome in pigeons. What would be the sex ratio in the offspring of a cross between a male that is heterozygous for the lethal allele and a normal female?

TLS Online TPP Program

#Question id: 4303

#Unit 3. Fundamental Processes

Which component is not directly involved in translation?

TLS Online TPP Program

#Question id: 4304

#Unit 3. Fundamental Processes

Using codon table, identify a 5′ → 3′ sequence of nucleotides in the DNA template strand for an mRNA coding for the polypeptide sequence Phe-Pro-Lys.

TLS Online TPP Program

#Question id: 4305

#Unit 3. Fundamental Processes

Which of the following molecules is a protein produced by a regulatory gene?

TLS Online TPP Program

#Question id: 4306

#Unit 3. Fundamental Processes

Which of the following molecules helps to "turn off" genes in a cell?

TLS Online TPP Program

#Question id: 4307

#Unit 3. Fundamental Processes

When taken up by a cell, which of the following molecules binds to a repressor so that the repressor no longer binds to the operator?

TLS Online TPP Program

#Question id: 4308

#Unit 3. Fundamental Processes

Most repressor proteins are allosteric. Which of the following molecules binds with the repressor to alter its conformation and therefore affect its function?