Mature RBCs lose their ability for
DNA replication
Anaerobic respiration
Aerobic respiration and DNA replication
Aerobic respiration, DNA replication and RNA synthesising machinery
D.
Aerobic respiration, DNA replication and RNA synthesising machinery
Matured mammalian RBCs do not have cell organelles including nucleus, Golgi bodies, mitochondria, ribosomes, centrioles and endoplasmic reticulum. It increases the surface area of RBCs and enables them to contain more haemoglobin. In the absence of cell organelles, the consumption of oxygen is very low and thus anaerobic respiration occurs in RBCs. Mature RBCs cannot replicate and cannot synthesise RNA as they do not possess machinery required (e.g., various enzymes) for replication and RNA synthesis.
Which of the following groups of algae produces algin?
Phaeophyceae and Chlorophyceae
Rhodophyceae and Phaeophyceae
Chlorophyceae and Rhodophyceae
Phaeophyceae only
Gonadotropin releasing hormone is transferred to anterior pituitary by
left coronary artery
hypophysial portal veins
axons of neurosecretory cells
nuclei of hypothalamus
Match the following and select correct option.
Column1 Column2
A. Pteris 1) Gymnosperm
B. Cycas 2) Bryophyte
C. Sphagnum 3) Algae
D. Sargassum 4) Pteridophyta
A-(4), B-(2), C-(1), D-(3)
A-(4), B-(1), C-(2), D-(3)
A-(2), B-(3), C-(4), D-(1)
A-(1), B-(4), C-(3), D-(2)
The 1st CO2 fixation product of C4 plant is
Oxaloacetic acid
ribulose biphosphate
phosphoenolpyruvate
phosphoglyceric acid.
Hiccups can be best described as
forceful sudden expiration
forceful contraction of intercostal muscles during deep breathing
vibration of the soft palate during breathing while sleeping
jerky incomplete inspiration.
Which one of the following is an incorrect combination
Adenine, thymine, cytidine
Adenine, cytosine, thymine
Guanine, thymine, uracil
Cytosine, uracil, guanine
Which part of the nephrons is impermeable to water
Proximal convoluted tubule
Distal convoluted tubule
Ascending limb of loop of Henle
Descending limb of loop of Henle
