Biology Exam

. the primary RNA transcript of the chicken ovalbium gene is 7700 nucleotides long, but the mature mRNA that is translated on the ribosome is 1872 nucleotides long. This size difference occurs primary as a result of

The structuree of Rho-independent terminator contains

Which of the following mRNA molecules would form the most stable stem-loop structure

Which of the subunits of RNA polymerase holoenzyme is responsible for promotor recognition

An mRNA is 429 nucleotides long. The number of ammo acids in the polypeptide chain formed from this mRNA is

. What links codons and anti-codons together during DNA translation

. An E. coli cell is grown up in the absence of glucose. which of the following may be true

Attenuation harpin-like structure is a result of pairing of

2 right

Enhancer sequences in eukaryotic organisms control

Choose true sentence

Transcription factors are

Crossing-over results in the new gene combinations in recombined chromosomes. How many recombined chromosomes are a product of single crossing-over?

The inactivation of human X chromosome is a result of (among others):

Choose the FALSE statement concerning the Barr body:

Satellites are structures , that can be present on:

. Which phrase does not apply to heterochromatin

. Indicate the correct sentence describing robertsonian translocation:

Which of the following is an example of a missense mutation?

If a cell has one chromosome in excess of the normal number of chromosomes present in the nucleus , it is referred to as:

Dimer repair mechanism include

The karyotype of a triploid plant contains 72 chromosomes. How many chromosomes would the karyotype of a diploid plant of the same species contain?

Point FALSE sentence

In phenylketonuria phenylalanine is :

Long QT syndrome is a disease caused by

Mutation changing the triplet GAG to GUG occurs in the following disease

The symptoms of vitamin D-resistant rickets is

A womam correctly recognizing colors whose father suffered from color blindness will give birth to twins; a boy and a girl. Father of twins is not color blind. What is the probability that the twins will be color blind?

. Moasic pattern of skin pigmentation is characteristic for

Which of the following is a proper description of a karyotype of a girl suffering from Philadelphia syndrome

The feature common for ALL individuals suffering from down syndrome is

A female can suffer from an inherited X-linked recessive disease if

A woman with blood group B and a man with blood group AB care about their children; one with blood group AB, one with group 0 and the third with group A. Which of them are their natural children?

A plant with purple flowers is allowed to self-pollinate. Generation after generation it produces purple flowers. this is an example of

Phenotypic ratio 9:7 is achieved by

Two black pigeons were crossed. In F1 generation was 20 birds showing ?being? black and white colouring. Assuming that feather colour is sex-linked the proper phenotypic ratio is

Which of the following would indicate a test cross, where T represents the dominant, tall trait and t represents the recessive, short, trait

Masking effect of two non-allelic genes is an example of

Gametes produced by an organism possess 38 chromosomes. How many pairs of homologous chromosomes contain lymphocytes of his organism

Southern blot (Sb) and northern blot (Nb) differ because

. Hybridization with fluorescent probe is used in