Biology Flashcards
In cats, black colour is caused by an X-linked allele at this locus cases orange colour. The heterozygote is tortoise-shell. What kinds of offspring would you expect from the cross of black female and orange male?
Tortoise Shell female; Black male
Which of the following show 9+0 arrangement of microtubular triplets?
Centrioles and basal bodies
Which of the following belongs to the tertiary hair?
-none of the answers is correct
The maximum volume of air that can be moved in and out during a single breath is called?
Vital capacity
Gene transcription takes place in?
Mitochondria and Nucleus
The outer to inner sequence of tissue layers in a post-gastrulation vertebrate embryo is?
Ectoderm -> mesoderm -> endoderm
Select the most correct statement?
The formation of a sperm is known as spermatogenesis
select the statement that best describes the DNA replication fork?
The leading strand can be synthesized in a continuos process from a singel RNA primer
select the statement that best describes the DNA replication fork?
The leading strand can be synthesized in a continuos process from a singel RNA primer
The leading and the lagging DNA strands differ in that?
the leading strand is synthesized in the same direction as the movement of the replication fork, and the lagging strand is syntheszied in the opposite direction
Select the statement that most correctly describes function of hormones secreted by the pancreas?
glucose regulation
Select the statement that most correctly describes the nucleus of a eukaryotic cell?
Nucleoli are dense staining areas and one or more of them can be present
The process of capturing a substance or particle from the cell by engulfing it with the cell membrane is?
Endocytosis
The structure of the neuron that conducts impulses from the cell body is?
Axon
The site of ribosomal subunit assembly is?
Nucleolus
Mutations will typically ……. the genetic diversity in a population:
Increase
Select the statement that most correctly describes the differences between prokaryotic and eukaryotic cells?
Bacterial cells can exist as independent unicellular organisms or part of multicellular organisms
Select the statement that most correctly describes the genetic code:
There are 64 amino-acid coding codons
Where is the majority of water reabsorbed?
Proximale tubule of nephron
Select the statement that most correctly describes the process of mitosis?
Chromosomes are maximally condensed at the end of metaphase
A cell has the following molecules and structures: enzymes, DNA, ribosomes, plasma membrane and mitochondria. It could be following cell?
a plant or an animal cell
Which of the following vitamins are recommended to be taken with fats?
Vitamin A and D
Select the statement that most correctly describes immunity?
All immune system responses are specific
Select the statement that most correctly describes cellular microfilaments?
Actin mediates fibroblast movement via rearrrangerment of its flagments
Picture showes chromosomes in eucaryotic cell. Recognise and name the phases of the cell cycle in the picture:
Anaphase
Select the statement that most correctly describes meiosis?
During the prophase I crossing over takes place
?????
Xrecesif
Select the most probable statement:
Conjugation is referred to as the bacterial equivalent of sexual process
Alternate forms and a gene having the same position a pair of chromosomes and affecting the same trait are called?
Alleles
Identical twins usually result from fertilisation of:
none of the answers is correct
An achondroplastic dwarf man with normal vision marries a colour-blind women of normal height. The mans father was 6 feet tall, and both woman
s parents were of average height. Achondroplastic dwarfism is autosomal dominant, blindness is X-linked recessive. What proportion of their male children would be colour-blind and normal height?
None of the answers is correct
Which of these associtations is mismatched?
-right ventrivle- pulmonary
-left ventricle -aorta
-inferior vena cava- right atrium
-Superior vena cava- right atrium
-all answers are correct
The thin filaments of a muscle fibre are made up of:
Actin
In which of the following would you usually find telomeres?
Human Chromsomes
All offspring of a white hen and a black rooster are gray. The simplest explanation of this pattern of inheritance is:
incomplete dominance
Which of the following organs and their main functions are correctly paired?
Liver: synthesis of insulin
Gallbladder: bile storage
The F1 offspring of Mendel`s classic pea cross always looked like one of the two parental varieties because:
one phenotype was completely dominant over another
Which of the following bones doesn`t take part on the formation of the orbit?
Ethmoid Bone
Which of the following is present in a prokaryotic cell?
ribosome
In sickle-cell disease, a single subsititution of an A by T on the B-globin gene causes the resultant protein to have altered properties, but to be of normal size. Select the term that most accurately describes this type of mutation?
Missense mutation
Diploid cell has 18 chromosomes. If a pair of homologous chromosomes fails to separate during anaphase of meioses II, what will be the chromosome number of the four resulting gametes?
10; 8; 9; 9
Which is the fundamental difference between prokaryotic and eukaryotic cell?
Presence of the nucleus enveloped by a membrane
Which of the following historical dates is correct?
The birth of the first cloned animal -Dolly the sheep- was published in 1997
The structure of deoxyribonucleic acid was discovered in 1953 by:
J.D Watson and F.Crick
The ability to reproduce themselves is a property that viruses share with living systems. Viruses can therefore replicate:
Only in a metabolically active cell
Which order of living systems by their level of organisation is correct?
Cell→organ→organism→community of organisms
Which of the following are classeified as non-cellular organisms?
Bacteriophages
Which of the following statements on HIV and its hosts is false?
HIV infects T-lymphocytes, i.e the cell relasting antibodies into blood plasma
Which of the following statements is false?
The closed blood circulation system was discovered by K. Landsteiner
The rate of simple diffusion across the plasma membrane depends on:
concentration gradient
DNA is present in?
Mitochondria
A differentiated cell of an organisms and the zygote this organism developed from are characterised by:
Identical Genomes
Which of the following mechanisms of neural exitation is true?
Changes in neuron plasma membrane permeability for Na+ and K+ ions
Which of the following is the regular component of a bacterial cell?
Cell Wall
Which is the correct order of cell cycle phases?
G1 –> S –> G2 –> M
Thickness of the plasma membrane is?
7,5nm
The flagellum of a eukaryotic cell is similar in ultrastructure to?
Cilium