Biology Times (^) March 19
Structural organisation in animals
- Epithelial cells in animals are held by specialized
junctions, one of them being “Gap junction”.
Function of a “Gap junction” is to [2016]
(a) Facilitate cell-cell communication by rapid
transfer of small molecules
(b) Cement the neighbouring cells
(c) Stop substances from leaking
(d) Provide gaps in the tissue to facilitate uptake
of small molecules across tissues- Which of the following statements is true about
glandular epithelium in salivary gland? [2016]
(a) It consists of isolated single cells
(b) It consists of mutlicellular cluster of cells
(c) Its secretions are endocrine
(d) It consists of squamous epithelial cells - Part of epidermis that keeps out unwanted
particles is called [2013]
(a) columnar epithelium
(b) squamous epithelium
(c) ciliated epithelium
(d) cuboidal epithelium - In vertebrates ‘glycogen ‘ is stored chiefly in
[2013]
(a) heart and blood
(b) spleen and stomach
(c) bones and lymph
(d) liver and muscles - Brown fat is a specialised adipose tissue with
abundant mitochondria and rich blood supply.
Brown fat [2013]
(a) insulates animals that are acclimatised to cold.
(b) is the major source of heat production of birds.
(c) provides energy to muscles.
(d) produces heat without producing ATP.- When a person beings to fast, after some time
glycongen stored in the liver is mobilized as
a source of glucose Which of the following
graphs best represents the change of glucose level
(y axis) in his blood, starting from the
time (x -axis) when the beings to fast? [2012]
(a) (b)(c) (d)Molecular basis of inheritance
1. Which of the following statements about
nucleosome is true? [2016]
(a) It consists of only DNA
(b) It is a nucleus-like structure found in
prokaryotes
(c) It consists of DNA and proteins
(d) It consists of only histone proteins- In the presence of glucose and lactose, Escherichia
coli utilizes glucose. However, lactose also enters
the cells because [2016]
(a) low level of permease is always present in the
cell
(b) it uses the same transporter as glucose
(c) if diffuses through the bacterial cell membrane
(d) it is transported through porins - An m RNA is transcribed from a DNA segment
having the base sequence 3’-TACATGGGT CCG