Which of the following is not a sexually transmitted disease?
Syphills
Acquired Immuno Deficiency Syndrome (AIDS)
Trichomoniasis
Trichomoniasis
An abnormal human baby with 'XXX' sex chromosomes was born due to
formation of abnormal sperms in the father
formation of abnormal ova in the mother
fusion of two ova and one sperm
fusion of two ova and one sperm
Alleles are
different phenotype
true breeding homozygotes
different molecular forms of a gene
different molecular forms of a gene
Gene regulation governing lactose operon of E.coli that involves the lac I gene product is
Positive and inducible because it can be induced by lactose
Negative and inducible because repressor protein prevents transcription
Negative and repressible because repressor protein prevents transcription.
Negative and repressible because repressor protein prevents transcription.
In sea Urchin DNA, which is double stranded, 17% of the bases were shown to be cytosine. The percentages of the other three bases expected to be present in this DNA are:
G 34%, A 24.5%, T 24.5%
G 17%, A 16.5%, T 32.5%
G 17%, A 33%, T 33%
G 17%, A 33%, T 33%
Which of the following had the smallest brain capacity?
Homo erectus
Homo sapiens
Homo neanderthalensis
Homo neanderthalensis
A population will not exist in Handy - Weinberg equilibrium if
individuals mate selectively
there are no mutations
there is no migration
there is no migration
A.
individuals mate selectively
Hardy-Weinberg equilibrium exists in population only when following conditions are present.
No mutation
No gene flow
No genetic drift
No genetic recombination
No natural selection pressure.
If the individuals in the population mate selectively, it will had to mutation thus shifting the Hardy-Weinberg equilibrium.
Match each disease with its correct type of vaccine:
Column I | Column II |
A. Tuberculosis | 1. Harmless virus |
B. Whooping cough | 2. Inactivated toxin |
C. Diphtheria | 3. Killed bacteria |
D. Polio | 4. Harmless bacteria |
HIV that causes AIDS, first starts destroying
B- Lymphocytes
Leucocytes
Helper T- Lymphocytes
Helper T- Lymphocytes
The active form of Entamoeba histolytica feeds upon
erythrocytes; mucosa and submucosa of colon
mucosa and submucosa of colon only
food in intestine
food in intestine