C2: CELL STRUCTURE & FUNCTIONS

What is the function of nucleolus?

• formation of secretory vesicles

• formation of ribosomes

• formation of messenger RNA (mRNA)

• formation of spindle fibres

Which of the following structure function pairs is mismatched?

• Smooth ER - detoxification

• Microtubules - formation of spindle fibres

• Mitochondrion- site for cellular respiration

• Lysosome - contains hormones

Which of the following is not an organelle?

• nucleus

• mitochondrion

• chlorophyll

• lysosome

Which of the following statements is the function of lysosomes?

• involves in generating ATP by aerobic metabolism.

• destroy worn out organelles

• involved in the separation of chromosomes

• involved in modifying, sorting and transporting proteins and lipids.

In bacteria, DNA is found _____________

• in the nucleus alone

• in both the nucleus and organelles

• in the nucleoid as a single circular thread

• in organelles alone

xylem is composed of all of the following cell types except

• tracheids

• vessel elements

• fibres and parenchyma

• sieve tube elements

The phospholipids molecules of most membranes have ......

• a hydrophilic head and a hydrophilic tail

• a hydrophobic head and a hydrophobic tail

• a hydrophilic head and two hydrophobic tails

• a hydrophobic head and two hydrophilic tails

the movement of a substance across a biological membrane against its concentration gradient with the help of energy input is ...

• diffusion

• active transport

• osmosis

• facilitated diffusion

Unlike eukaryotic cells, prokaryotic cells ___________

• have RNA, not DNA

• do not have cell wall

• have mesosome instead of mitochondria

• have cell membranes as well as nuclear envelope

Which of the following pair of organelles have double membrane?

• Chloroplast and mitochondria

• Mitochondria and lysosomes

• Nucleus and ribosomes

• Chloroplast and ribosomes