Which of the following cell organelles is present in the highest number in secretory cells?
Non-membranous nucleoplasmic structures in the nucleus, are the sites for active synthesis of:
Which of the following nucleic acids is present in an organism having 70 S ribosomes only?
1. Single-stranded DNA with a protein coat
2. Double-stranded circular naked DNA
3. Double-stranded DNA enclosed in nuclear membrane
4. Double-stranded circular DNA with histone proteins
After meiosis I, the resultant daughter cells have
|1.||same amount of DNA as in the parent cell in S|
|2.||twice the amount of DNA in comparison to haploid|
|3.||same amount of DNA in comparison to haploid gamete|
|4.||four times the amount of DNA in comparison to haploid gamete|
Which of the following organic compounds is the main constituent of Lecithin?
1. Arachidonic acid
The main difference between active and passive transport across cell membrane is :
|1.||passive transport is non-selective whereas active transport is selective|
|2.||passive transport requires a concentration gradient across a biological membrane whereas active transport requires energy to move solutes.|
|3.||passive transport is confined to anionic carrier proteins whereas active transport is confined to cationic channel.|
|4.||active transport occurs more rapidly than passive|
Match the items given in Column - I with those in Column - II and choose the correct option:
|(c)||Oxyntic cells||(iii)||Milk proteins|
Kwashiorkor disease is due to:
|1.||simultaneous deficiency of proteins and fats|
|2.||simultaneous deficiency of proteins and calories|
|3.||deficiency of carbohydrates|
|4.||protein deficiency not accompanied by calorie deficiency|
Select the correct sequence of events.
|1.||Gametogenesis → Gamete transfer → Syngamy → Zygote → Cell division (Cleavage) → Cell differentiation → Organogenesis|
|2.||Gametogenesis → Gamete transfer → Syngamy → Zygote → Cell division (Cleavage) → Organogenesis → Cell differentiation|
|3.||Gametogenesis → Syngamy → Gamete transfer → Zygote → Cell division (Cleavage) → Cell differentiation → Organogenesis|
|4.||Gametogenesis → Gamete transfer → Syngamy → Zygote → Cell differentiation → Cell division (Cleavage) → Organogenesis|
Which of the following hormones is responsible for both the milk ejection reflex and the foetal ejection reflex?