By crossing Aa x Aa, what is the ratio of phenotypes in the offspring produced? Assume complete dominance for the trait.
Select one:
75% dominant:: 25% recessive
Which statement is true of sickle cell anaemia?
A) It involves red blood cells.
B) It confers resistance to malaria.
D) It involves a one-amino-acid change in haemoglobin.
an individual with Turner syndrome
short stature, characterized by 45x genotype, is female
Identify the correct structure of a nucleotide of DNA
phosphate-deoxyribose-adenine
Which statement is not true of the nuclear envelope?
it’s inner membrane bears ribosomes
Mesozoic era into time periods
Triassic Jurassic cretaceous
pepsin is produced in
stomach
part of neuron that brings the impulse into the neurocyte
dendrite
which organelles are responsible for intracellular respiration
mitochondria
we study the flow of energy through an ecosystem, we describe three types of organisms:
producers, consumers, and:
decomposers
the nuclear membrane
.contains pores
F.controls the transport between the nucleus and cytoplasm
For G2phase of cell cycle is typical:
follows after S phase of cell cycle, and includes the replication of mitochondria and other organelles
Parents are O and AB blood groups. Their children could have blood groups:
50% A and 50% B, and different from parents blood groups
The most common aneuploidy in newborns is
trisomy of chromosome 21 and downs syndrome
Lipids are organic compounds that in a living cell may combine with:
proteins and polysacharrides
Smooth endoplasmic reticulum is found in:
eukaryotes
A prokaryotic cell does not contain:
nucleolus
The rough ER is so named because it has an abundance of ________ on it.
ribosomes
Animal and plant cells share the same structures except for:
thylakoid
Proteins embedded in a lipid bilayer” best describes the following structure:
cell membrane
ATP is required in the transport of:
low to high concentration against CG
nucleus contains
nucleoplasm and chromatin
Prior to cell division, each chromosome replicates its genetic material. The
products are connected by a centromere and are called:
sister chromatids
During meiosis, any of the two chromosomes belonging to the whole chromosome set, randomly:
Select one:
ne:
a. become paired
b. exchange genetic material
c. are subjected to crossing over
d. all is false
e. all is true
D all is false !
Different types of cells produced during oogenesis are called
oogocyuim oocyte and polar body
Spermatogenesis gives rise to spermatides which are:
haploid and precursor of spermatozoa
In humans, fertilization of an egg normally takes place when the sperm and egg unite in the:
fallopian tube
The membrane which forms a sac, filled with fluid, that serves as a protection for the developing embryo is the:
Amnion
Conjugation, transformation and transduction are connected to:
bacteria
Genetically identical organisms derived from a single genetic source are called:
clones
All mentioned below about DNA structure is correct EXCEPT:
deoxyribose and a base form a nucleotide
codon
is a triplet
For transcription the DNA polymerase is used.true or false
false
M-phase of the cell cycle is comprised of:
Select one:
mitosis and cytokenisis
The result of the monohybrid cross in the F2 generation is a characteristic 3:1 ratio of:
Select one:
dominant : recessive phenotypes
Find the wrong statement among the following that are true for more than two alternative forms of a single gene:
Select one:
All of them can be found in the single individual.
n a dihybrid cross parental generation can consist of parents that are:
both homozygous for both traits
In the classical test cross, the testing of the dominant phenotype is always done with:
a recessive homozygote
hemophilia is a hereditary
x linked disease
Recombination of genes is the result of all except:
Select one:
chiasma
Which disease is usually not the result of a mutation:
haemoloysis
What does a restriction enzyme do?
Select one:
cuts DNA in specific sites
Hearts own pacemaker is called:
sinoatrial node
Appendix (vermiform) is an outgrowth of the:
colon
Oxygen is transported from lungs to tissues:
bounded to haemoglobin in erythrocytes
A concentration of carbon dioxide in the blood stimulates the breathing center in the:
Select one:
medulla oblongata
The majority of oxygen in the bloodstream is carried in red blood cells on a globular protein called:
hemoglobin
adrenal cortex produced
androgens and oestrogen
olfaction is
sense of smell
spleen and lymph nodes are part of the
immune system
Ecology is the study of the interrelationships between organisms and their:
living and nonliving environment
Cromagnon and Neanderthal men are:
Select one:
fossil men and cave dwellers
Cromagnon and Neanderthal men are:
Select one:
fossil men and cave dwellers
A region that has a characteristic set of environmental conditions and consequently a particular type of fauna and flora is called:
biotope