Practice Questions

TLS Online TPP Program

#Question id: 2477

Where are microtubules observed to be present in different polarities?

#Unit 2. Cellular Organization

axons of nerve cells
animal cells in interphase
animal cells in mitosis
dendrites of nerve cells

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TLS Online TPP Program

#Question id: 23287

#Unit 8. Inheritance Biology

Chromosome mutations can be grouped into three basic categories:

I) Chromosome rearrangements

III) Polyploidy

these mutation alters the number and structure of chromosomes such as,

a) One or more individual chromosomes are added or deleted

b) The loss of a chromosomal segment

c) A piece of a chromosome might be duplicated, deleted, or inverted

d) One or more complete sets of chromosomes are added

e) In which one or more copies of a DNA segment is produced

Find out the correct pairing of chromosomal mutations,

TLS Online TPP Program

#Question id: 3637

#Unit 8. Inheritance Biology

Parents that are homozygous for different mutations a, b and c are crossed, producing offspring that are heterozygous as following

aa X bb = ab (X)

bb X cc = bc (Y)

aa X cc = ac (Z)

If a and b belong to same locus but b and c belong to different locus then phenotype of heterozygote

TLS Online TPP Program

#Question id: 11058

#Unit 10. Ecological Principles

The pufferfish, a common marine fish, has extensive spines that extend outward when it swallows water, becoming several times its normal size. This is an example of what kind of defense against predation?

TLS Online TPP Program

#Question id: 5809

#Unit 8. Inheritance Biology

Based on the physiological adaptation theory, bacterial populations that had not been exposed to T1 infection:

TLS Online TPP Program

#Question id: 7019

#Unit 5. Developmental Biology

During primary sex determination in mammals, the bipotential gonad is moved into the female pathway (ovary development) by the Wnt4 and Rspo1 genes, which promote accumulation of: